HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from St. Louis to Seattle (STL - SEA) from $91

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — SEA
May 7 — May 141
From?
To?
Tue 5/7
Tue 5/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

The best prices from Lambert-St Louis to Seattle/Tacoma Intl are usually found in November or October, booked 87 days in advance, depart on a Thursday or Monday and return on a Tuesday

Cheap flight deals from St. Louis to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 2, 2024.

Popular in

July

Cheapest in

November

Round-trip from

$245

One-way from

$135
High demand for flights, 31% potential price rise
Search Deals
Best time to find cheap flights, 26% potential price drop
Search Deals
From Lambert-St Louis to Seattle/Tacoma Intl
Search Deals
One-way flight from Lambert-St Louis to Seattle/Tacoma Intl
Search Deals

What is the cheapest day to fly round-trip from St. Louis to Seattle?

Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 20% on the overall cost on flights from St. Louis to Seattle.

How far in advance should I book a flight from St. Louis to Seattle?

Find a great deal and save up to 111% by booking at least 10 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to Seattle within the next two weeks, with the cheapest ticket starting at $268.

What is the cheapest month to fly from St. Louis to Seattle?

Flights from St. Louis to Seattle lean towards being more expensive in July. Prices are generally better when you fly from St. Louis to Seattle in November, with the cheapest ticket starting at $115.

When is the cheapest time to fly from St. Louis to Seattle (STL - SEA)?

Unlike in the evening, when flights are generally more expensive, you can save up to 28% on flights from St. Louis to Seattle by exploring options for tickets in the afternoon.

Cheap Frontier flights from St. Louis to Seattle

Explore cheap flight options specifically provided by Frontier for the route between St. Louis and Seattle. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Peruse some of the lowest-priced Frontier flights we've found from St. Louis to Seattle. Deals update often to give you more flight options matching your criteria
Sat 8/318:00 pmSTL - SEA
1 stop14h 37mFrontier
Tue 9/37:51 pmSEA - STL
1 stop12h 27mFrontier
Deal found 5/1$169
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Mon 5/208:00 pmSEA - STL
1 stop12h 13mFrontier
Deal found 5/1$170
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Fri 5/1710:24 pmSEA - STL
1 stop9h 01mFrontier
Deal found 4/30$173
Thu 5/1611:06 pmSTL - SEA
1 stop11h 39mFrontier
Sun 5/198:04 amSEA - STL
1 stop23h 32mFrontier
Deal found 5/1$174
Tue 8/1310:32 pmSTL - SEA
1 stop12h 05mFrontier
Mon 8/1910:08 pmSEA - STL
1 stop11h 42mFrontier
Deal found 5/1$175
Sat 5/188:04 pmSTL - SEA
1 stop13h 00mFrontier
Mon 5/208:00 pmSEA - STL
1 stop12h 13mFrontier
Deal found 4/30$179
Wed 5/158:04 pmSTL - SEA
1 stop14h 26mFrontier
Mon 5/206:29 pmSEA - STL
1 stop16h 40mFrontier
Deal found 5/1$180
Mon 5/2010:21 pmSTL - SEA
1 stop13h 34mFrontier
Fri 5/249:04 pmSEA - STL
1 stop11h 09mFrontier
Deal found 5/1$183
Fri 8/167:29 pmSTL - SEA
1 stop25h 32mFrontier
Tue 8/207:51 pmSEA - STL
1 stop12h 27mFrontier
Deal found 5/1$184

  • One of the most popular airlines traveling from St. Louis to Seattle is Frontier. Flights from Frontier traveling this route typically cost $397.19 RT. This price is typically 43% cheaper than other airlines that offer St. Louis to Seattle flights. When booking this route, the cheapest RT price found was $167. Lambert-St Louis Airport is the most common St. Louis airport to take off from when flying to Seattle. Seattle/Tacoma Intl Airport is the most popular arrival airport in Seattle. When flying from St. Louis to Seattle, Frontier flights are 11% more popular than any other airline flying that same route.

Cheap American Airlines flights from St. Louis to Seattle

Explore cheap flight options specifically provided by American Airlines for the route between St. Louis and Seattle. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Take a gander at the lowest prices we've found on American Airlines flights from St. Louis to Seattle. Make sure to examine the flight information before completing your reservation.
Tue 9/39:44 amSTL - SEA
1 stop11h 36mAmerican Airlines
Sat 11/26:00 amSEA - STL
1 stop8h 11mAmerican Airlines
Deal found 5/1$230
Wed 5/82:00 pmSTL - SEA
1 stop10h 41mAmerican Airlines
Tue 5/141:15 amSEA - STL
1 stop9h 16mAmerican Airlines
Deal found 4/30$239
Wed 5/82:00 pmSTL - SEA
1 stop10h 41mAmerican Airlines
Fri 5/101:15 amSEA - STL
1 stop7h 13mAmerican Airlines
Deal found 5/1$274
Wed 8/145:30 amSTL - SEA
1 stop9h 04mAmerican Airlines
Sat 8/1712:18 amSEA - STL
1 stop6h 46mAmerican Airlines
Deal found 5/1$286
Wed 5/296:18 pmSTL - SEA
1 stop7h 57mAmerican Airlines
Tue 6/412:20 amSEA - STL
1 stop6h 34mAmerican Airlines
Deal found 5/1$307
Wed 5/155:55 amSTL - SEA
1 stop8h 31mAmerican Airlines
Sun 5/191:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/1$317
Wed 5/85:04 amSTL - SEA
1 stop8h 04mAmerican Airlines
Sun 5/121:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 4/30$340
Sat 5/186:18 pmSTL - SEA
1 stop7h 57mAmerican Airlines
Sun 5/191:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 4/30$342
Wed 5/82:00 pmSTL - SEA
1 stop10h 41mAmerican Airlines
Sun 5/121:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/1$350

  • If you’re traveling from St. Louis to Seattle, one of the more common airlines traveling that route is American Airlines. Flights from American Airlines traveling this route typically cost $486.19 RT. This price is typically 47% more expensive than other airlines that offer St. Louis to Seattle flights. When booking this route, the cheapest RT price found was $176. The most popular departure airport in St. Louis when flying to Seattle is Lambert-St Louis Airport. The most popular airport to fly into when visiting Seattle is Seattle/Tacoma Intl Airport. When flying from St. Louis to Seattle, American Airlines flights are 1% more popular than any other airline flying that same route.

Cheap St. Louis to Seattle flights in May & June 2024

Find cheap flight options from St. Louis to Seattle specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,899,487 searches. Prices were last updated on May 2, 2024.
These are some of the most attractive deals on flights from St. Louis to Seattle in 2024. More deals are always being added, so be sure to check back regularly.
Mon 5/2010:21 pmSTL - SEA
1 stop13h 34mMultiple Airlines
Tue 5/289:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 4/30$139
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mMultiple Airlines
Tue 5/149:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 4/30$147
Fri 5/1010:17 pmSTL - SEA
1 stop13h 03mMultiple Airlines
Tue 5/149:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 4/30$162
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Mon 5/208:00 pmSEA - STL
1 stop12h 13mFrontier
Deal found 5/1$170
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Fri 5/1710:24 pmSEA - STL
1 stop9h 01mFrontier
Deal found 4/30$173
Wed 5/87:51 pmSTL - SEA
1 stop22h 40mFrontier
Wed 5/159:50 pmSEA - STL
1 stop22h 16mFrontier
Deal found 4/30$174
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Mon 5/208:00 pmSEA - STL
1 stop12h 13mFrontier
Deal found 4/30$178
Sat 5/188:04 pmSTL - SEA
1 stop13h 00mFrontier
Mon 5/208:00 pmSEA - STL
1 stop12h 13mFrontier
Deal found 4/30$179
Wed 5/87:51 pmSTL - SEA
1 stop22h 40mFrontier
Mon 5/139:00 pmSEA - STL
1 stop11h 09mFrontier
Deal found 5/1$180

St. Louis to Seattle 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Seattle in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
These are some of the most attractive deals on flights from St. Louis to Seattle in 2024. More deals are always being added, so be sure to check back regularly.
Mon 5/2010:21 pmSTL - SEA
1 stop13h 34mMultiple Airlines
Tue 5/289:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 4/30$139
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mMultiple Airlines
Tue 5/149:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 4/30$147
Fri 5/1010:17 pmSTL - SEA
1 stop13h 03mMultiple Airlines
Tue 5/149:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 4/30$162
Thu 8/227:29 pmSTL - SEA
1 stop17h 19mFrontier
Sat 8/317:51 pmSEA - STL
1 stop12h 27mFrontier
Deal found 4/30$169
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Mon 5/208:00 pmSEA - STL
1 stop12h 13mFrontier
Deal found 5/1$170
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Fri 5/1710:24 pmSEA - STL
1 stop9h 01mFrontier
Deal found 4/30$173
Wed 5/87:51 pmSTL - SEA
1 stop22h 40mFrontier
Wed 5/159:50 pmSEA - STL
1 stop22h 16mFrontier
Deal found 4/30$174
Tue 8/1310:32 pmSTL - SEA
1 stop12h 05mFrontier
Mon 8/1910:08 pmSEA - STL
1 stop11h 42mFrontier
Deal found 5/1$175
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Mon 5/208:00 pmSEA - STL
1 stop12h 13mFrontier
Deal found 4/30$178

Non-stop flights to Seattle from St. Louis

Discover non-stop flight options from St. Louis to Seattle. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
To help reduce your travel time, choose from one of these non-stop flights from St. Louis to Seattle. If you're looking for other options for flights from St. Louis to Seattle, make sure to update the search form at the top of page.
Wed 5/297:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Tue 6/45:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/1$237
Wed 5/227:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Fri 5/245:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/1$257
Fri 5/247:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Tue 5/287:37 amSEA - STL
Nonstop3h 59mAlaska Airlines
Deal found 5/1$277
Mon 5/277:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Fri 5/315:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/1$297
Sat 6/17:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Wed 6/57:37 amSEA - STL
Nonstop3h 59mAlaska Airlines
Deal found 4/30$307
Mon 5/207:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Tue 5/287:37 amSEA - STL
Nonstop3h 59mAlaska Airlines
Deal found 4/30$322
Thu 5/232:36 pmSTL - SEA
Nonstop4h 13mAlaska Airlines
Thu 5/307:37 amSEA - STL
Nonstop3h 59mAlaska Airlines
Deal found 5/1$327
Sun 5/197:00 amSTL - SEA
Nonstop4h 14mAlaska Airlines
Fri 5/245:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/1$342
Fri 5/247:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Fri 5/315:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 4/30$387

St. Louis to Seattle flights leaving soon

Find last-minute flight options from St. Louis to Seattle for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Have a look at some of the flights available from St. Louis to Seattle departing last-minute. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Fri 5/1010:17 pmSTL - SEA
1 stop13h 03mMultiple Airlines
Tue 5/149:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 4/30$162
Wed 5/87:51 pmSTL - SEA
1 stop22h 40mFrontier
Wed 5/159:50 pmSEA - STL
1 stop22h 16mFrontier
Deal found 4/30$174
Wed 5/87:51 pmSTL - SEA
1 stop22h 40mFrontier
Mon 5/139:00 pmSEA - STL
1 stop11h 09mFrontier
Deal found 5/1$180
Wed 5/87:51 pmSTL - SEA
1 stop22h 40mFrontier
Mon 5/139:55 amSEA - STL
1 stop9h 08mFrontier
Deal found 4/30$193
Thu 5/97:51 pmSTL - SEA
1 stop25h 39mFrontier
Sun 5/1210:30 pmSEA - STL
1 stop9h 17mFrontier
Deal found 5/1$194
Thu 5/911:38 amSTL - SEA
1 stop11h 36mFrontier
Sun 5/129:20 pmSEA - STL
1 stop10h 58mFrontier
Deal found 4/30$216
Wed 5/82:00 pmSTL - SEA
1 stop10h 41mAmerican Airlines
Tue 5/141:15 amSEA - STL
1 stop9h 16mAmerican Airlines
Deal found 4/30$239
Wed 5/82:00 pmSTL - SEA
1 stop10h 41mAmerican Airlines
Fri 5/101:15 amSEA - STL
1 stop7h 13mAmerican Airlines
Deal found 5/1$274
Thu 5/92:28 pmSTL - SEA
1 stop5h 58mDelta
Sat 5/1112:40 amSEA - STL
1 stop8h 30mDelta
Deal found 4/30$276

One-way flights to Seattle from St. Louis

Search for one-way flight options from St. Louis to Seattle. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
If you're seeking multiple options on one-way flights from St. Louis to Seattle, be sure to check out these deals, which are updated often. Those seeking round-trip flights from St. Louis to Seattle should utilize the search form at the the top of the page.
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Deal found 4/30$91
Wed 5/87:51 pmSTL - SEA
1 stop22h 40mFrontier
Deal found 5/1$92
Fri 5/1010:17 pmSTL - SEA
1 stop13h 03mFrontier
Deal found 5/1$95
Tue 8/1310:32 pmSTL - SEA
1 stop12h 05mFrontier
Deal found 5/1$96
Wed 6/57:29 pmSTL - SEA
1 stop28h 36mFrontier
Deal found 5/1$100
Wed 8/148:00 pmSTL - SEA
1 stop14h 37mFrontier
Deal found 5/1$101
Thu 6/207:29 pmSTL - SEA
1 stop15h 08mFrontier
Deal found 5/1$110
Mon 6/178:22 pmSTL - SEA
1 stop14h 17mFrontier
Deal found 5/1$111
Thu 6/66:50 pmSTL - SEA
1 stop7h 09mDelta
Deal found 5/1$113

Find flights from St. Louis to Seattle within your budget

Customize your flight search to find flights from St. Louis to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$139 - $361

Route

Depart

Return

Price

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Mon 5/20

1 stop13h 34m

Seattle/Tacoma Intl

Tue 5/28

1 stop11h 06m

$139

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Sat 8/31

1 stop14h 37m

Seattle/Tacoma Intl

Tue 9/3

1 stop12h 27m

$169

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Mon 5/13

1 stop13h 51m

Seattle/Tacoma Intl

Mon 5/20

1 stop12h 13m

$170

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Sat 5/25

1 stop13h 00m

Seattle/Tacoma Intl

Tue 5/28

1 stop11h 06m

$189

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 9/3

1 stop11h 36m

Seattle/Tacoma Intl

Sat 11/2

1 stop8h 11m

$230

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 5/29

Nonstop4h 19m

Seattle/Tacoma Intl

Wed 6/5

Nonstop3h 59m

$237

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 5/29

1 stop10h 53m

Seattle/Tacoma Intl

Wed 6/5

2 stops31h 54m

$272

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 9/18

1 stop7h 00m

Seattle/Tacoma Intl

Tue 9/24

1 stop7h 20m

$288

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 8/28

1 stop8h 15m

Seattle/Tacoma Intl

Sat 8/31

Nonstop3h 50m

$361

Flights are sorted by cheapest first

Deals found on 4/30

When is the best time to book a flight from St. Louis to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Seattle. Price data was last updated on January 28, 2024.
The best time to book flights from St. Louis to Seattle is 87 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Search Deals

When is the cheapest time to fly from St. Louis to Seattle?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Seattle. Price data was last updated on April 28, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their St. Louis to Seattle flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Seattle by month

Plan your trip from St. Louis to Seattle by taking into account the cheapest months to travel. The average price of a one-way flight from St. Louis to Seattle is currently $101 while a round-trip flight costs $228. Price data was last updated on April 28, 2024.

Currently, December is the cheapest month in which you can book a flight from St. Louis to Seattle (average of $245). Flying from St. Louis to Seattle in July is currently the most expensive (average of $408). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

$247

February

$254

March

$288

April

$294

May

$320

June

$406

July

$408

August

$343

September

$278

October

$257

November

$258

December

$245

Temperature and rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average temperature and rainfall totals by month.

SEA

Temperature

41 - 66.2 °F

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated May 2, 2024.
See what other customers who have flown with Frontier, American Airlines and Alaska Airlines from St. Louis to Seattle have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
6,121 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Southwest
8.2
Very good
6,121 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Alaska Airlines
8.1
Very good
9,115 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Delta
8.1
Very good
10,874 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

United Airlines
7.4
Good
11,159 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

American Airlines
7.3
Good
14,788 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from St. Louis to Seattle?

    Booking a flight from Lambert-St Louis (STL) to Seattle/Tacoma Intl (SEA) is your only option if you wish to fly from St. Louis to Seattle. On a typical day, there are 6 flights from Lambert-St Louis to Seattle/Tacoma Intl, all of which are around 4h 19m for a nonstop flight. You can also purchase a plane ticket from 8 airlines when you book a flight from Lambert-St Louis to Seattle.

  • Can I find flights from St. Louis to Seattle for under $200 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Seattle for under $200. The cheapest flight booked recently is on Multiple Airlines for just $139, but on average you can expect to pay $183.

  • Are there nonstop flights from St. Louis to Seattle for under $300 on Cheapflights?

    Cheapflights has at least 20 direct flights from St. Louis to Seattle under $300. A good price for a nonstop flight from St. Louis to Seattle is less than $394.

  • Are there last-minute flights available from St. Louis to Seattle for under $200?

    There are currently 20+ open flights from St. Louis to Seattle within the next 7 days for less than $200.

  • What days are nonstop flights available from St. Louis to Seattle?

    Nonstop flights can be found on the following days: Monday.

  • How popular is this St. Louis to Seattle flight route?

    Within the past month, 57 users have taken a look at flights from Lambert-St Louis to Seattle/Tacoma Intl.

  • How many flights depart from St. Louis to Seattle on average per day?

    Per day, 3 flights depart from St. Louis to Seattle on average.
    Afternoon (Noon - 6pm) - 100% of flight departures

  • How long is the flight from St. Louis to Seattle?

    Airlines like Frontier fly from St. Louis to Seattle in about 14h 37m. The time it takes to get you to your destination can typically vary by up to . There are 1714 mi between St. Louis and Seattle.

  • What is the cheapest airline to fly from St. Louis to Seattle round-trip?

    Currently priced at $169, Frontier will fly you from St. Louis to Seattle and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. You may be able to fly from St. Louis to Seattle for 55% less than the average price by searching for this airline.

  • What are the cheapest airlines to fly from St. Louis to Seattle one-way?

    The cheapest airlines for a one-way flight from St. Louis to Seattle are Frontier ($91), Delta ($113), and Alaska Airlines ($119).

  • What are the most popular airlines that fly from St. Louis to Seattle?

    Consider Undisclosed Carrier, American Airlines or Alaska Airlines when booking your flight. These represent the most popular airlines when flying from St. Louis to Seattle.

  • What are the most reliable airlines from St. Louis to Seattle?

    The top 3 most reliable airlines when flying from St. Louis to Seattle are Qatar Airways (97%), Japan Airlines (97%) and American Airlines (95%).

  • What are the cheapest flights from St. Louis to Seattle?

    Looking for the cheapest flight from St. Louis to Seattle? While on average our users pay $891, our data indicates the cheapest price to be $158. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $139.

  • What does STL to SEA mean?

    STL stands for Lambert-St Louis Airport, while SEA stands for Seattle/Tacoma Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.

  • Where are the most common layover locations when flying from St. Louis to Seattle?

    St. Louis to Seattle flights have a layover in Salt Lake City most of the time.

  • What are some popular things to do or see while on a layover in Salt Lake City?

    Most Salt Lake City visitors opt to spend their time experiencing Temple Square, Family History Library, and Hogle Zoo. Temple Square, Family History Library, and Hogle Zoo can be accessed by traveling approximately 4.7 mi, 4.7 mi, and 9.1 mi, respectively from Salt Lake City. Travelers in need of a car in Salt Lake City can rent one for about $55 per day.

  • Where are the least popular layover locations for St. Louis to Seattle flights?

    The least popular layover on flights from St. Louis to Seattle is Denver.

  • Can I find deals for flights from St. Louis to Seattle that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Seattle flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Seattle with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Seattle flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from St. Louis to Seattle that include hotel bookings?

    Yes. In addition to deals on St. Louis to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Seattle.

  • Can I find deals for business class flights from St. Louis to Seattle?

    Yes. Cheapflights offers flight deals from St. Louis to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from St. Louis to Seattle that allow pets onboard?

    Many airlines flying from St. Louis to Seattle offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Seattle?

    Yes, you can often find last-minute deals on St. Louis to Seattle flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to Seattle flight deals updated?

    The St. Louis to Seattle flight deals you see on this page were last updated on 5/1.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Seattle
See prices for flight routes from nearby airports that may be better suited for you.

Kansas City to Seattle flights
Springfield to Seattle flights
Kansas City to Spokane flights
St. Louis to Spokane flights
Columbia to Seattle flights
Joplin to Seattle flights
St. Louis to Pasco flights
Kansas City to Pasco flights
Springfield to Spokane flights
Columbia to Spokane flights
Kansas City to Walla Walla flights
Joplin to Spokane flights
Kirksville to Seattle flights
St. Louis to Pullman flights
Branson to Seattle flights
St. Louis to Yakima flights

Top 7 airlines flying from St. Louis to Seattle

Discover the top 7 airlines that operate flights from St. Louis to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$143Average$231FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Spirit AirlinesCheapest$155Average$306FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
DeltaCheapest$161Average$286FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$167Average$397FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Sun Country AirCheapest$169Average$384FlexibilityNo cancel feeOn-time83%
Search Sun Country Air flights
American AirlinesCheapest$176Average$486FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$178Average$345FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Philadelphia to Denver flights
Chicago to Toronto flights
Minneapolis to Seattle flights
New York to Atlanta flights
Minneapolis to New York flights
New York to Japan flights
Boston to San Diego flights
Sacramento to Dallas flights
San Francisco to Boston flights
Los Angeles to Washington, D.C. flights
Boston to Austin flights
St. Louis to Seoul flights

Search flights from St. Louis to Seattle by cabin class

Find flights from St. Louis to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from St. Louis to Seattle

Find hourly flight availability from St. Louis to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 2, 2024.
0%of flight departuresEarly morningMidnight to 6 am
55%of flight departuresMorning6 am to noon
45%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to Seattle

Explore weekly flight availability from St. Louis to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 2, 2024.
Sunday4daily flights
Monday8daily flights
Tuesday6daily flights
Wednesday4daily flights
Thursday6daily flights
Friday8daily flights
Saturday6daily flights

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Saint Peter Jersey
Flights to Kirkwall Arpt
Flights to Skiathos
Flights to Naxos
Flights to Ningbo Lishe Intl
Flights to Edremit/Korfez
Flights to Bourgas
Flights to Bodø
Flights to Pellston Emmet County
Flights to Cornwall Newquay
Flights to Ordu/Giresun
Flights to Batumi
Flights to Mason City
Flights to Biarritz Parme
Flights to Zakynthos Dionsios Salomos
Flights to Cortez Montezuma County
Flights to Clermont-Ferrand Aulnat
Flights to Nevsehir
Flights to Hyannis Barnstable
Flights to Girona Costa Brava
Flights to Kagoshima
Flights to Perugia Sant Egidio
Flights to Oran Es Senia
Flights to Chios

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Seattle?

Deals for St. Louis to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Seattle?

Cheapflights helps you find that perfect flight to Seattle from St. Louis by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from St. Louis to Seattle with no change fees?

Certainly. Search results for flights to Seattle from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from St. Louis to Seattle become cheaper?

Of course! You can now track prices for flights from St. Louis to Seattle and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines