Cheap flights from Portland to St. Louis (PWM - STL) from $162

This is the cheapest round-trip 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.
PWM — STL
May 7 — May 141

The best prices from Portland to Lambert-St Louis are usually found in March or January, booked 47 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Portland to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to St. Louis (STL). 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

December

Cheapest in

March

Average price

$440

Round-trip from

$322
High demand for flights, 23% potential price rise
Best time to find cheap flights, 23% potential price drop
Average for round-trip flights in May 2024
From Portland to Lambert-St Louis

What is the cheapest day to fly round-trip from Portland, Maine to St. Louis?

Departing on a Tuesday is a good option for securing a great price. You can expect to save up to 57% when planning your travel around this day of the week.

How far in advance should I book a flight from Portland, Maine to St. Louis?

To save up to 189% on this flight, we recommend booking at least 48 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Portland, Maine to St. Louis from $565 1-2 weeks out and tickets from $700 for flights departing within the next 72 hours.

What is the cheapest month to fly from Portland, Maine to St. Louis?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, March can be a great choice for travel to St. Louis. Flights to St. Louis from Portland, Maine in March are about $472 on average during March, but can be found for as low as $314.

When is the cheapest time to fly from Portland, Maine to St. Louis (PWM - STL)?

When flying from Portland, Maine to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 7% versus a flight in the afternoon.

Cheap Frontier flights from Portland to St. Louis

Explore cheap flight options specifically provided by Frontier for the route between Portland and St. Louis. 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.
Check out some of the cheapest Frontier flights we've come across from Portland to St. Louis. Come back soon if you're not finding the exact deal you're looking for.
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Wed 6/58:13 amSTL - PWM
1 stop23h 53mFrontier
Deal found 5/1$162
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Mon 5/209:26 pmSTL - PWM
1 stop10h 43mFrontier
Deal found 5/1$163
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Mon 6/106:16 pmSTL - PWM
1 stop13h 50mFrontier
Deal found 5/1$172

Cheap Delta flights from Portland to St. Louis

Explore cheap flight options specifically provided by Delta for the route between Portland and St. Louis. 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.
Some of the best deals we've found on Delta flights traveling from Portland to St. Louis. Check back soon if you're not seeing flights that suit your needs.
Wed 8/216:30 amPWM - STL
1 stop5h 43mDelta
Sat 8/245:30 pmSTL - PWM
1 stop4h 36mDelta
Deal found 5/1$286
Mon 6/36:05 amPWM - STL
1 stop6h 43mDelta
Mon 6/103:10 pmSTL - PWM
1 stop6h 50mDelta
Deal found 5/1$346
Wed 6/263:46 pmPWM - STL
1 stop6h 08mDelta
Sun 6/306:30 amSTL - PWM
1 stop4h 42mDelta
Deal found 5/1$356
Sun 5/195:00 amPWM - STL
1 stop5h 19mDelta
Sun 5/265:29 pmSTL - PWM
1 stop5h 15mDelta
Deal found 5/1$426
Wed 8/216:30 amPWM - STL
2 stops10h 27mDelta
Sat 8/245:30 pmSTL - PWM
1 stop4h 36mDelta
Deal found 5/1$451
Wed 8/216:30 amPWM - STL
2 stops10h 27mDelta
Sat 8/245:30 pmSTL - PWM
1 stop4h 36mDelta
Deal found 4/30$461
Mon 6/36:05 amPWM - STL
1 stop6h 43mDelta
Mon 6/36:12 pmSTL - PWM
1 stop4h 32mDelta
Deal found 5/1$482
Wed 5/295:00 amPWM - STL
1 stop5h 19mDelta
Sun 6/212:53 pmSTL - PWM
1 stop8h 06mDelta
Deal found 5/1$497
Thu 5/3011:42 amPWM - STL
1 stop6h 34mDelta
Sun 6/212:53 pmSTL - PWM
1 stop8h 06mDelta
Deal found 5/1$517

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

Find cheap flight options from Portland to St. Louis 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.
Check out some of the best flight deals from Portland to St. Louis in 2024. More deals are always being added, so be sure to check back regularly.
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Wed 6/58:13 amSTL - PWM
1 stop23h 53mFrontier
Deal found 5/1$162
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Mon 5/209:26 pmSTL - PWM
1 stop10h 43mFrontier
Deal found 5/1$163
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Mon 6/106:16 pmSTL - PWM
1 stop13h 50mFrontier
Deal found 5/1$172
Wed 5/297:45 amPWM - STL
1 stop6h 25mAmerican Airlines
Wed 6/57:10 amSTL - PWM
1 stop7h 23mAmerican Airlines
Deal found 5/1$334
Mon 5/69:11 amPWM - STL
1 stop12h 00mFrontier
Mon 5/139:11 pmSTL - PWM
1 stop13h 59mFrontier
Deal found 5/1$340
Wed 5/297:45 amPWM - STL
1 stop6h 25mAmerican Airlines
Wed 6/56:08 amSTL - PWM
1 stop8h 53mAmerican Airlines
Deal found 5/1$348
Thu 5/237:45 amPWM - STL
1 stop6h 25mAmerican Airlines
Sun 5/264:20 pmSTL - PWM
1 stop5h 24mAmerican Airlines
Deal found 5/1$423
Sun 5/195:00 amPWM - STL
1 stop5h 19mDelta
Sun 5/265:29 pmSTL - PWM
1 stop5h 15mDelta
Deal found 5/1$426
Mon 5/1310:50 amPWM - STL
2 stops23h 49mMultiple Airlines
Wed 6/51:55 pmSTL - PWM
2 stops21h 46mMultiple Airlines
Deal found 5/1$435

Portland to St. Louis 2024 flight deals

Discover exclusive flight deals for travel between Portland and St. Louis 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.
Check out some of the best flight deals from Portland to St. Louis in 2024. More deals are always being added, so be sure to check back regularly.
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Wed 6/58:13 amSTL - PWM
1 stop23h 53mFrontier
Deal found 5/1$162
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Mon 5/209:26 pmSTL - PWM
1 stop10h 43mFrontier
Deal found 5/1$163
Mon 5/139:11 amPWM - STL
1 stop12h 00mFrontier
Mon 6/106:16 pmSTL - PWM
1 stop13h 50mFrontier
Deal found 5/1$172
Wed 8/216:30 amPWM - STL
1 stop5h 43mDelta
Sat 8/245:30 pmSTL - PWM
1 stop4h 36mDelta
Deal found 5/1$286
Wed 5/297:45 amPWM - STL
1 stop6h 25mAmerican Airlines
Wed 6/57:10 amSTL - PWM
1 stop7h 23mAmerican Airlines
Deal found 5/1$334
Mon 7/151:27 pmPWM - STL
1 stop23h 57mSun Country Air
Fri 7/193:22 pmSTL - PWM
1 stop18h 53mSun Country Air
Deal found 5/1$335
Mon 5/69:11 amPWM - STL
1 stop12h 00mFrontier
Mon 5/139:11 pmSTL - PWM
1 stop13h 59mFrontier
Deal found 5/1$340
Mon 6/36:05 amPWM - STL
1 stop6h 43mDelta
Mon 6/103:10 pmSTL - PWM
1 stop6h 50mDelta
Deal found 5/1$346
Wed 5/297:45 amPWM - STL
1 stop6h 25mAmerican Airlines
Wed 6/56:08 amSTL - PWM
1 stop8h 53mAmerican Airlines
Deal found 5/1$348

One-way flights to St. Louis from Portland

Search for one-way flight options from Portland to St. Louis. 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.
Take a look at some of the best available options we've come across on one-way flights from Portland to St. Louis. Those seeking round-trip flights from Portland to St. Louis should utilize the search form at the the top of the page.
Fri 7/266:01 amPWM - STL
1 stop7h 18mDelta
Deal found 5/1$213
Sat 7/65:31 amPWM - STL
1 stop5h 59mAmerican Airlines
Deal found 5/1$258
Fri 7/261:40 pmPWM - STL
2 stops21h 54mMultiple Airlines
Deal found 5/1$305
Sun 7/71:27 pmPWM - STL
3 stops24h 33mMultiple Airlines
Deal found 5/1$314
Sun 7/71:27 pmPWM - STL
3 stops24h 33mMultiple Airlines
Deal found 5/1$315
Sun 7/71:27 pmPWM - STL
2 stops25h 24mMultiple Airlines
Deal found 5/1$319
Sun 7/71:27 pmPWM - STL
2 stops25h 24mMultiple Airlines
Deal found 5/1$325
Sun 8/45:26 pmPWM - STL
1 stop5h 03mAmerican Airlines
Deal found 5/1$333
Sun 7/711:57 amPWM - STL
1 stop12h 24mDelta
Deal found 5/1$343

Find flights from Portland to St. Louis within your budget

Customize your flight search to find flights from Portland to St. Louis 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

$162 - $491

Route

Depart

Return

Price

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 5/13

1 stop12h 00m

Lambert-St Louis

Wed 6/5

1 stop23h 53m

$162

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 5/13

1 stop12h 00m

Lambert-St Louis

Mon 5/20

1 stop10h 43m

$163

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 5/13

1 stop12h 00m

Lambert-St Louis

Mon 6/10

1 stop13h 50m

$172

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Wed 8/21

1 stop5h 43m

Lambert-St Louis

Sat 8/24

1 stop4h 36m

$286

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Wed 5/29

1 stop6h 25m

Lambert-St Louis

Wed 6/5

1 stop7h 23m

$334

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 7/15

1 stop23h 57m

Lambert-St Louis

Fri 7/19

1 stop18h 53m

$335

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 6/3

1 stop6h 43m

Lambert-St Louis

Mon 6/10

1 stop6h 50m

$346

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 5/13

2 stops23h 49m

Lambert-St Louis

Wed 6/5

2 stops21h 46m

$435

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Thu 5/23

1 stop5h 03m

Lambert-St Louis

Sun 5/26

2 stops16h 01m

$491

Flights are sorted by cheapest first

Deals found on 5/1

When is the best time to book a flight from Portland, Maine to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Portland to St. Louis. Price data was last updated on January 28, 2024.
The price you pay for your flight from Portland, Maine to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 47 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Search Deals

When is the cheapest time to fly from Portland, Maine to St. Louis?

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

Average price of flights to St. Louis by month

Plan your trip from Portland to St. Louis by taking into account the cheapest months to travel. The average price of a one-way flight from Portland to St. Louis is currently $303 while a round-trip flight costs $303. Price data was last updated on April 28, 2024.

Currently, September is the cheapest month in which you can book a flight from Portland, Maine to St. Louis (average of $322). Flying from Portland, Maine to St. Louis in July is currently the most expensive (average of $377). 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

$326

February

$331

March

$357

April

$337

May

$345

June

$371

July

$377

August

$336

September

$322

October

$324

November

$336

December

$326

Temperature and rainfall in St. Louis by month

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

STL

Temperature

32 - 80.6 °F

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated May 2, 2024.
Peruse reviews from past customers who have flown with Frontier, Delta and American Airlines from Portland to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
10,874 reviews

Food

7.4

Boarding

8.2

Crew

8.6

Overall

8.1

Entertainment

8.0

Comfort

7.9

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

8.1
Very good
10,874 reviews
8.1
Very good
10,874 reviews

Food

7.4

Boarding

8.2

Crew

8.6

Overall

8.1

Entertainment

8.0

Comfort

7.9

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

7.4
Good
11,159 reviews
8.1
Very good
10,874 reviews

Food

7.4

Boarding

8.2

Crew

8.6

Overall

8.1

Entertainment

8.0

Comfort

7.9

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

7.3
Good
14,788 reviews
8.1
Very good
10,874 reviews

Food

7.4

Boarding

8.2

Crew

8.6

Overall

8.1

Entertainment

8.0

Comfort

7.9

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

7.3
Good
650 reviews
8.1
Very good
10,874 reviews

Food

7.4

Boarding

8.2

Crew

8.6

Overall

8.1

Entertainment

8.0

Comfort

7.9

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

6.3
Okay
4,114 reviews
8.1
Very good
10,874 reviews

Food

7.4

Boarding

8.2

Crew

8.6

Overall

8.1

Entertainment

8.0

Comfort

7.9

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

Related info for your journey

Find useful and relevant information for your journey from Portland to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • Can I find flights from Portland, Maine to St. Louis for under $200 on Cheapflights?

    Yes, there are multiple flights from Portland, Maine to St. Louis for under $200. The cheapest flight booked recently is on Frontier for just $162, but on average you can expect to pay $367.

  • What are the cheapest airlines flying from Portland, Maine to St. Louis round-trip?

    Flying on Frontier is currently your cheapest option to St. Louis, with prices starting at $162. Additional round-trip tickets that might be worth considering are offered by Delta and American Airlines, with the lowest prices starting at $286 and $334, respectively. Frontier is 65% cheaper than the average price of flights available within the next 90 days to this destination.

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

    For one-way options, check prices for Delta. According to our data, you can fly for as low as $213. Users have also found prices from $258 and $357 on American Airlines and United Airlines, respectively.

  • What are the most popular airlines that fly from Portland, Maine to St. Louis?

  • What does PWM to STL mean?

    PWM stands for Portland Airport, while STL stands for Lambert-St Louis 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.

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

    The amount of baggage you can bring on your Portland to St. Louis 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 Portland to St. Louis with specific airlines?

    Yes, Cheapflights allows you to browse and filter Portland to St. Louis 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 Portland to St. Louis that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland to St. Louis 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 Portland to St. Louis that allow pets onboard?

    Many airlines flying from Portland to St. Louis 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 Portland to St. Louis?

    Yes, you can often find last-minute deals on Portland to St. Louis 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 Portland, Maine to St. Louis flight deals updated?

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

See more FAQs

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

Top 4 airlines flying from Portland to St. Louis

Discover the top 4 airlines that operate flights from Portland to St. Louis. 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
JetBlueCheapest$242Average$474FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
United AirlinesCheapest$338Average$540FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$346Average$490FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$363Average$483FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Search flights from Portland to St. Louis by cabin class

Find flights from Portland to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.

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 Portland to St. Louis?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Portland to St. Louis. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights helps you find that perfect flight to St. Louis from Portland 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 Portland to St. Louis with no change fees?

Certainly. Search results for flights to St. Louis from Portland 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 Portland to St. Louis become cheaper?

Yes, Cheapflights offers price alerts on Portland to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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