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Cheap flights from St. Louis (STL) to Idaho from $151

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 9/4. 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 — BOI
may. 21 — may. 281
From?
To?
mar. 5/21
mar. 5/28
1 adult, Economy
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How far in advance should I book a flight from St. Louis to Idaho?

Users have found that booking a flight from St. Louis to Idaho at least 18 days early can save you up to 119% on average compared to booking a flight this week. If booking 18 days before your flight isn’t an option for you, users have found flights from St. Louis to Idaho for as little as $379 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $773 for flights departing within the next 3 days.

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

Flights from St. Louis to Idaho lean towards being more expensive in March. Prices are generally better when you fly from St. Louis to Idaho in January, with the cheapest ticket starting at $298.

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

When flying from St. Louis to Idaho, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Cheap American Airlines flights from St. Louis to Idaho

Explore cheap flight options specifically provided by American Airlines for the route between St. Louis and Idaho. 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 2,637,452 searches. Data last updated mayo 16, 2024.
Consider these cheap American Airlines flights we've found departing from St. Louis to Idaho. Be sure to come back soon if the deals available don't appeal to you at this time.
lun. 7/15:27 amSTL - BOI
1 stop6h 33mAmerican Airlines
mar. 7/912:51 amBOI - STL
1 stop7h 38mAmerican Airlines
Deal found 5/15$303
mié. 5/292:28 pmSTL - GEG
1 stop10h 45mAmerican Airlines
mié. 6/510:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Deal found 5/15$306
lun. 7/16:11 pmSTL - BOI
1 stop6h 05mAmerican Airlines
mié. 7/105:12 pmBOI - STL
1 stop5h 43mAmerican Airlines
Deal found 5/15$335
lun. 8/1912:48 pmSTL - GEG
1 stop10h 03mAmerican Airlines
jue. 8/2910:32 pmGEG - STL
1 stop7h 47mAmerican Airlines
Deal found 5/15$351
vie. 8/26:09 pmSTL - GEG
1 stop6h 52mAmerican Airlines
dom. 8/1810:32 pmGEG - STL
1 stop7h 39mAmerican Airlines
Deal found 5/15$365
dom. 6/165:27 amSTL - BOI
1 stop6h 33mAmerican Airlines
lun. 6/173:33 pmBOI - STL
1 stop6h 24mAmerican Airlines
Deal found 5/15$366
lun. 8/195:30 amSTL - JAC
1 stop6h 49mAmerican Airlines
jue. 8/292:59 pmJAC - STL
1 stop6h 09mAmerican Airlines
Deal found 5/15$371
mié. 6/196:11 pmSTL - GEG
1 stop6h 49mAmerican Airlines
dom. 6/2310:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Deal found 5/16$373
mar. 8/205:30 amSTL - JAC
1 stop6h 49mAmerican Airlines
mar. 8/2711:59 amJAC - STL
1 stop6h 02mAmerican Airlines
Deal found 5/15$394

Cheap Spirit Airlines flights from St. Louis to Idaho

Explore cheap flight options specifically provided by Spirit Airlines for the route between St. Louis and Idaho. 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 2,637,452 searches. Data last updated mayo 16, 2024.
Take a gander at the lowest prices we've found on Spirit Airlines flights from St. Louis to Idaho. Deals are refreshing constantly so come back soon for more options.
vie. 6/213:07 pmSTL - BOI
1 stop22h 46mSpirit Airlines
dom. 6/239:13 pmBOI - STL
1 stop15h 38mSpirit Airlines
Deal found 5/15$337
jue. 6/136:22 pmSTL - BOI
3 stops43h 31mSpirit Airlines
jue. 6/209:13 pmBOI - STL
1 stop16h 03mSpirit Airlines
Deal found 5/15$439
dom. 6/165:22 pmSTL - BOI
3 stops26h 07mSpirit Airlines
lun. 6/179:13 pmBOI - STL
3 stops16h 10mSpirit Airlines
Deal found 5/15$475

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

Find cheap flight options from St. Louis to Idaho specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on mayo 16, 2024.
Listed are some of the best fares we've found on flights departing from St. Louis to Idaho in 2024. For more flight deals, be sure to check back very soon.
vie. 6/75:56 pmSTL - GEG
1 stop7h 47mDelta
vie. 6/145:15 pmGEG - STL
1 stop5h 43mDelta
Deal found 5/15$304
mié. 5/292:28 pmSTL - GEG
1 stop10h 45mAmerican Airlines
mié. 6/510:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Deal found 5/15$306
vie. 6/213:07 pmSTL - BOI
1 stop22h 46mSpirit Airlines
dom. 6/239:13 pmBOI - STL
1 stop15h 38mSpirit Airlines
Deal found 5/15$337
lun. 6/176:25 pmSTL - GEG
1 stop7h 20mDelta
lun. 6/245:15 pmGEG - STL
1 stop5h 43mDelta
Deal found 5/16$366
dom. 6/165:27 amSTL - BOI
1 stop6h 33mAmerican Airlines
lun. 6/173:33 pmBOI - STL
1 stop6h 24mAmerican Airlines
Deal found 5/15$366
mié. 6/196:11 pmSTL - GEG
1 stop6h 49mAmerican Airlines
dom. 6/2310:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Deal found 5/16$373
lun. 6/172:29 pmSTL - GEG
2 stops10h 26mDelta
lun. 6/245:15 pmGEG - STL
1 stop5h 43mDelta
Deal found 5/16$374
mié. 5/295:37 pmSTL - GEG
1 stop7h 15mDelta
mié. 6/512:42 pmGEG - STL
2 stops10h 14mDelta
Deal found 5/15$380
vie. 6/145:56 pmSTL - GEG
1 stop7h 47mDelta
dom. 6/1610:00 amGEG - STL
1 stop5h 35mDelta
Deal found 5/15$381

St. Louis to Idaho 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Idaho in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated mayo 16, 2024.
Listed are some of the best fares we've found on flights departing from St. Louis to Idaho in 2024. For more flight deals, be sure to check back very soon.
vie. 8/237:30 amSTL - LWS
1 stop6h 15mDelta
mar. 8/2712:30 pmLWS - STL
1 stop7h 06mDelta
Deal found 5/15$291
mié. 9/43:30 pmSTL - GEG
1 stop6h 30mDelta
sáb. 9/76:00 amGEG - STL
1 stop5h 25mDelta
Deal found 5/15$303
lun. 7/15:27 amSTL - BOI
1 stop6h 33mAmerican Airlines
mar. 7/912:51 amBOI - STL
1 stop7h 38mAmerican Airlines
Deal found 5/15$303
vie. 6/75:56 pmSTL - GEG
1 stop7h 47mDelta
vie. 6/145:15 pmGEG - STL
1 stop5h 43mDelta
Deal found 5/15$304
vie. 8/236:59 pmSTL - LWS
2 stops28h 01mDelta
mar. 8/2712:30 pmLWS - STL
1 stop7h 06mDelta
Deal found 5/15$305
mié. 5/292:28 pmSTL - GEG
1 stop10h 45mAmerican Airlines
mié. 6/510:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Deal found 5/15$306
lun. 7/86:30 pmSTL - GEG
1 stop7h 05mDelta
sáb. 7/1312:11 pmGEG - STL
1 stop7h 56mDelta
Deal found 5/15$331
mié. 9/46:59 pmSTL - GEG
1 stop5h 37mDelta
sáb. 9/78:00 amGEG - STL
2 stops11h 17mDelta
Deal found 5/15$333
vie. 8/236:59 pmSTL - GEG
1 stop6h 41mDelta
lun. 8/2612:45 pmGEG - STL
1 stop8h 54mDelta
Deal found 5/15$335

St. Louis to Idaho flights leaving soon

Find last-minute flight options from St. Louis to Idaho 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 2,637,452 searches. Data last updated mayo 16, 2024.
Users seeking a last-minute flight from St. Louis to Idaho should consider booking one of these fares. Users should be sure to double check the price, date, and time of their last-minute flight.
sáb. 5/2511:39 amSTL - BOI
2 stops24h 46mMultiple Airlines
vie. 5/3110:54 amBOI - STL
3 stops24h 11mMultiple Airlines
Deal found 5/14$392
sáb. 5/2511:39 amSTL - BOI
3 stops33h 21mMultiple Airlines
vie. 5/3110:54 amBOI - STL
3 stops24h 11mMultiple Airlines
Deal found 5/14$404
jue. 5/232:28 pmSTL - GEG
1 stop5h 54mDelta
jue. 5/302:20 pmGEG - STL
1 stop5h 32mDelta
Deal found 5/15$408
sáb. 5/2511:39 amSTL - BOI
2 stops24h 46mMultiple Airlines
vie. 5/3110:54 amBOI - STL
2 stops22h 34mMultiple Airlines
Deal found 5/14$436
sáb. 5/252:34 pmSTL - BOI
1 stop9h 26mAlaska Airlines
vie. 5/313:02 pmBOI - STL
1 stop7h 57mAlaska Airlines
Deal found 5/14$438
mié. 5/225:30 pmSTL - GEG
1 stop8h 24mDelta
mar. 5/282:20 pmGEG - STL
1 stop5h 32mDelta
Deal found 5/15$512
jue. 5/237:55 amSTL - GEG
1 stop6h 03mDelta
jue. 5/309:09 amGEG - STL
2 stops10h 43mDelta
Deal found 5/15$518
sáb. 5/259:51 amSTL - BOI
2 stops13h 02mAmerican Airlines
vie. 5/315:15 pmBOI - STL
1 stop5h 41mAmerican Airlines
Deal found 5/14$531
jue. 5/236:11 amSTL - BOI
1 stop7h 15mDelta
vie. 5/245:59 pmBOI - STL
1 stop5h 47mDelta
Deal found 5/15$542

One-way flights to Idaho from St. Louis

Search for one-way flight options from St. Louis to Idaho. 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 2,637,452 searches. Data last updated mayo 16, 2024.
Take a look at some of the best available options we've come across on one-way flights from St. Louis to Idaho. Users can also find round-trip St. Louis to Idaho flights by using the search form above.
mié. 9/42:05 pmSTL - GEG
1 stop8h 23mAmerican Airlines
Deal found 5/15$151
dom. 7/286:30 pmSTL - GEG
1 stop7h 05mDelta
Deal found 5/15$152
jue. 10/34:20 pmSTL - GEG
1 stop6h 08mAmerican Airlines
Deal found 5/15$171
dom. 6/21:25 pmSTL - BOI
3 stops28h 05mMultiple Airlines
Deal found 5/14$182
dom. 7/286:30 pmSTL - GEG
1 stop7h 05mDelta
Deal found 5/16$183
dom. 6/27:55 amSTL - BOI
1 stop5h 27mDelta
Deal found 5/14$189
mié. 9/43:30 pmSTL - GEG
2 stops10h 22mDelta
Deal found 5/15$196
dom. 9/14:22 pmSTL - JAC
1 stop24h 14mAmerican Airlines
Deal found 5/15$214
jue. 10/32:05 pmSTL - GEG
2 stops11h 48mAlaska Airlines
Deal found 5/15$221

Find flights from St. Louis to Idaho within your budget

Customize your flight search to find flights from St. Louis to Idaho 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 2,637,452 searches. Data last updated mayo 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$291 - $417

Route

Depart

Return

Price

Lambert-St LouisLewiston Nez Perce Rgnl

STL - LWS

STLLWS

Lambert-St Louis

vie. 8/23

1 stop6h 15m

Lewiston Nez Perce Rgnl

mar. 8/27

1 stop7h 06m

$291

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

lun. 7/1

1 stop6h 33m

Boise Air Term. Gowen Fld

mar. 7/9

1 stop7h 38m

$303

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mié. 9/4

1 stop6h 30m

Spokane

sáb. 9/7

1 stop5h 25m

$303

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

vie. 6/7

1 stop7h 47m

Spokane

vie. 6/14

1 stop5h 43m

$304

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mié. 5/29

1 stop10h 45m

Spokane

mié. 6/5

1 stop8h 00m

$306

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

vie. 6/21

1 stop22h 46m

Boise Air Term. Gowen Fld

dom. 6/23

1 stop15h 38m

$337

Lambert-St LouisLewiston Nez Perce Rgnl

STL - LWS

STLLWS

Lambert-St Louis

vie. 8/23

2 stops13h 09m

Lewiston Nez Perce Rgnl

mar. 8/27

2 stops13h 01m

$376

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

vie. 6/21

2 stops18h 23m

Boise Air Term. Gowen Fld

dom. 6/23

1 stop15h 38m

$407

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

vie. 6/7

2 stops26h 48m

Spokane

lun. 6/10

1 stop28h 27m

$417

Flights are sorted by cheapest first

Deals found on 5/15

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. 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 Idaho. Reviews last updated mayo 16, 2024.
Read through reviews of airlines operating flights from St. Louis to Idaho, such as American Airlines, Spirit Airlines and Alaska Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.6

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Alaska Airlines
8.1
Very good
9,157 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.6

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Delta
8.0
Very good
10,673 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.6

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

United Airlines
7.4
Good
10,924 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.6

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

American Airlines
7.3
Good
14,514 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.6

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Spirit Airlines
6.4
Okay
8,672 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.6

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Related info for your journey

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

  • What airport do you fly from for flights from St. Louis to Idaho?

    For a flight from St. Louis to Idaho, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

  • Can I find flights from St. Louis to Idaho for under $300 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Idaho for under $300. The cheapest flight booked recently is on Delta for just $291, but on average you can expect to pay $334.

  • Are there last-minute flights available from St. Louis to Idaho for under $400?

    There are currently 20+ open flights from St. Louis to Idaho within the next 7 days for less than $400.

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

    The cheapest airlines for a one-way flight from St. Louis to Idaho are American Airlines ($151), Delta ($152), and Alaska Airlines ($221).

  • What are the most popular routes from St. Louis to Idaho?

    The most popular route from St. Louis to Idaho is Lambert-St Louis - Jackson Hole. You may also consider Lambert-St Louis - Spokane or Lambert-St Louis - Boise Air Term. Gowen Fld.

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

    When booking a flight from St. Louis to Idaho, you may want to consider flying on American Airlines, Alaska Airlines or Delta as they are the most popular for this route.

  • What does STL to BOI mean?

    STL and BOI are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. STL to BOI refers to a flight route from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport. Idaho Falls Fanning Field Airport (IDA), Hailey Sun Valley-Friedman Airport (SUN), Lewiston Nez Perce Rgnl Airport (LWS), Pocatello Airport (PIH), Twin Falls Joslin Airport (TWF) are other airports near this flight route and their unique identifiers/IATA codes.

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

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

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

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

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

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

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

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

    Many airlines flying from St. Louis to Idaho 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 Idaho?

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

    The St. Louis to Idaho flight deals you see on this page were last updated on 5/15.

See more FAQs

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Alternative routes for St. Louis to Idaho
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Top 5 airlines flying from St. Louis to Idaho

Discover the top 5 airlines that operate flights from St. Louis to Idaho. 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 2,637,452 searches. Data last updated mayo 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$197Average$250FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
DeltaCheapest$296Average$619FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$304Average$388FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
American AirlinesCheapest$307Average$549FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$316Average$656FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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Search flights from St. Louis to Idaho by cabin class

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

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Idaho from St. Louis today with Cheapflights!

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Idaho from St. Louis.

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

Yes! Cheapflights helps users easily find flights from St. Louis to Idaho with no change fees.

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

Yes, Cheapflights offers price alerts on St. Louis to Idaho 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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