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Cheap flights from St. Louis (STL) to Idaho from $61

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 5/20. 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
Mai 1 — Mai 81
From?
To?
Mi 5/1
Mi 5/8
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 16 days early can save you up to 227% on average compared to booking a flight this week. If booking 16 days before your flight isn’t an option for you, users have found flights from St. Louis to Idaho for as little as $355 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 $651 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 December. Prices are generally better when you fly from St. Louis to Idaho in February, with the cheapest ticket starting at $278.

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 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 3,068,117 searches. Data last updated April 26, 2024.
Consider these cheap Spirit 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.
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Di 5/289:15 pmBOI - STL
1 stop12h 31mSpirit Airlines
Deal found 4/25$103
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Mi 5/228:46 pmBOI - STL
3 stops19h 43mSpirit Airlines
Deal found 4/26$208
Mi 5/2911:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Fr 5/3110:54 amBOI - STL
2 stops22h 34mSpirit Airlines
Deal found 4/25$305
Mi 5/2911:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Fr 5/319:15 pmBOI - STL
3 stops18h 10mSpirit Airlines
Deal found 4/25$339
Fr 6/213:07 pmSTL - BOI
1 stop22h 46mSpirit Airlines
Do 6/279:16 pmBOI - STL
1 stop16h 00mSpirit Airlines
Deal found 4/25$367
Do 7/188:49 pmSTL - BOI
2 stops25h 48mSpirit Airlines
So 7/2811:05 pmBOI - STL
1 stop14h 12mSpirit Airlines
Deal found 4/25$399
Do 7/258:49 pmSTL - BOI
2 stops26h 14mSpirit Airlines
So 7/2810:35 pmBOI - STL
1 stop14h 42mSpirit Airlines
Deal found 4/26$429
Do 7/188:49 pmSTL - BOI
3 stops25h 48mSpirit Airlines
So 7/2810:35 pmBOI - STL
1 stop14h 42mSpirit Airlines
Deal found 4/25$480

Cheap Delta flights from St. Louis to Idaho

Explore cheap flight options specifically provided by Delta 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 3,068,117 searches. Data last updated April 26, 2024.
Take a gander at the lowest prices we've found on Delta flights from St. Louis to Idaho. Deals are refreshing constantly so come back soon for more options.
Mi 5/295:37 pmSTL - GEG
1 stop7h 15mDelta
Mi 6/512:18 pmGEG - STL
1 stop9h 22mDelta
Deal found 4/25$294
Fr 8/236:59 pmSTL - LWS
2 stops28h 01mDelta
Di 8/2712:30 pmLWS - STL
1 stop7h 06mDelta
Deal found 4/24$295
Mi 5/295:30 pmSTL - GEG
1 stop8h 24mDelta
Mi 6/512:42 pmGEG - STL
2 stops10h 04mDelta
Deal found 4/25$313
Sa 6/227:55 amSTL - GEG
1 stop6h 20mDelta
Mi 6/266:00 amGEG - STL
1 stop6h 33mDelta
Deal found 4/25$325
Fr 8/236:59 pmSTL - LWS
2 stops28h 01mDelta
Di 8/277:00 amLWS - STL
2 stops12h 36mDelta
Deal found 4/25$331
Mi 5/295:37 pmSTL - GEG
1 stop7h 15mDelta
Do 6/612:42 pmGEG - STL
2 stops10h 04mDelta
Deal found 4/24$333
Do 8/15:59 pmSTL - BOI
1 stop6h 54mDelta
Mo 8/55:59 pmBOI - STL
1 stop5h 37mDelta
Deal found 4/25$336
Mi 5/155:30 pmSTL - BOI
1 stop7h 44mDelta
Mi 5/225:59 pmBOI - STL
1 stop5h 47mDelta
Deal found 4/26$342
Sa 6/15:30 pmSTL - BOI
1 stop6h 35mDelta
So 6/165:30 amBOI - STL
1 stop8h 03mDelta
Deal found 4/25$356

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

Find cheap flight options from St. Louis to Idaho specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,068,117 searches. Prices were last updated on April 26, 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.
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Di 5/289:15 pmBOI - STL
1 stop12h 31mSpirit Airlines
Deal found 4/25$103
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Mi 5/228:46 pmBOI - STL
3 stops19h 43mSpirit Airlines
Deal found 4/26$208
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mMultiple Airlines
Di 5/289:15 pmBOI - STL
3 stops18h 00mMultiple Airlines
Deal found 4/25$252
Mi 5/295:37 pmSTL - GEG
1 stop7h 15mDelta
Mi 6/512:18 pmGEG - STL
1 stop9h 22mDelta
Deal found 4/25$294
Mi 5/295:37 pmSTL - BOI
1 stop7h 13mDelta
Fr 5/315:59 pmBOI - STL
1 stop5h 47mDelta
Deal found 4/25$294
Mi 5/2911:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Fr 5/3110:54 amBOI - STL
2 stops22h 34mSpirit Airlines
Deal found 4/25$305
Mi 5/295:30 pmSTL - GEG
1 stop8h 24mDelta
Mi 6/512:42 pmGEG - STL
2 stops10h 04mDelta
Deal found 4/25$313
Mi 5/298:00 amSTL - GEG
1 stop7h 29mAmerican Airlines
Do 6/610:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Deal found 4/24$323
Mi 5/295:37 pmSTL - GEG
1 stop7h 15mDelta
Do 6/612:42 pmGEG - STL
2 stops10h 04mDelta
Deal found 4/24$333

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 3,068,117 searches. Data last updated April 26, 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.
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Di 5/289:15 pmBOI - STL
1 stop12h 31mSpirit Airlines
Deal found 4/25$103
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Mi 5/228:46 pmBOI - STL
3 stops19h 43mSpirit Airlines
Deal found 4/26$208
Mi 5/1511:36 amSTL - BOI
1 stop9h 20mMultiple Airlines
Di 5/289:15 pmBOI - STL
3 stops18h 00mMultiple Airlines
Deal found 4/25$252
Mi 5/295:37 pmSTL - GEG
1 stop7h 15mDelta
Mi 6/512:18 pmGEG - STL
1 stop9h 22mDelta
Deal found 4/25$294
Mo 7/15:27 amSTL - BOI
1 stop6h 33mAmerican Airlines
Di 7/912:59 amBOI - STL
1 stop7h 30mAmerican Airlines
Deal found 4/25$294
Fr 8/236:59 pmSTL - LWS
2 stops28h 01mDelta
Di 8/2712:30 pmLWS - STL
1 stop7h 06mDelta
Deal found 4/24$295
Mi 5/2911:36 amSTL - BOI
1 stop9h 20mSpirit Airlines
Fr 5/3110:54 amBOI - STL
2 stops22h 34mSpirit Airlines
Deal found 4/25$305
Fr 6/217:30 pmSTL - BOI
1 stop21h 53mMultiple Airlines
Do 6/277:19 pmBOI - STL
1 stop17h 57mMultiple Airlines
Deal found 4/25$308
Mi 5/295:30 pmSTL - GEG
1 stop8h 24mDelta
Mi 6/512:42 pmGEG - STL
2 stops10h 04mDelta
Deal found 4/25$313

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 3,068,117 searches. Data last updated April 26, 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.
Mi 5/17:00 amSTL - GEG
1 stop7h 38mAlaska Airlines
Sa 5/46:25 amGEG - STL
2 stops15h 34mAlaska Airlines
Deal found 4/24$605
Mi 5/16:05 amSTL - GEG
2 stops29h 47mAlaska Airlines
Sa 5/112:50 pmGEG - STL
1 stop7h 09mAlaska Airlines
Deal found 4/25$631
Mi 5/17:00 amSTL - GEG
1 stop7h 38mAlaska Airlines
Sa 5/45:00 amGEG - STL
1 stop6h 23mAlaska Airlines
Deal found 4/24$632
Mi 5/15:30 pmSTL - GEG
2 stops17h 10mDelta
Sa 5/47:30 amGEG - STL
2 stops11h 47mDelta
Deal found 4/25$652
Mi 5/15:40 pmSTL - GEG
1 stop6h 46mDelta
Sa 5/111:10 pmGEG - STL
1 stop6h 14mDelta
Deal found 4/25$671
Mi 5/16:05 amSTL - GEG
2 stops29h 47mAlaska Airlines
Sa 5/1111:49 amGEG - STL
2 stops10h 07mAlaska Airlines
Deal found 4/25$679
Fr 5/36:50 pmSTL - GEG
1 stop6h 49mDelta
So 5/510:11 amGEG - STL
1 stop5h 31mDelta
Deal found 4/25$680
Fr 5/311:26 amSTL - GEG
2 stops13h 35mAlaska Airlines
So 5/510:35 amGEG - STL
2 stops11h 24mAlaska Airlines
Deal found 4/25$704
Mi 5/13:06 pmSTL - GEG
2 stops10h 57mDelta
Sa 5/412:15 pmGEG - STL
1 stop7h 45mDelta
Deal found 4/25$712

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 3,068,117 searches. Data last updated April 26, 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.
Mo 5/204:05 pmSTL - BOI
1 stop29h 20mSpirit Airlines
Deal found 4/25$61
Fr 5/314:05 pmSTL - BOI
1 stop29h 20mSpirit Airlines
Deal found 4/25$68
Mo 5/2012:00 pmSTL - BOI
3 stops33h 25mMultiple Airlines
Deal found 4/25$137
Fr 5/244:05 pmSTL - BOI
1 stop29h 20mSpirit Airlines
Deal found 4/25$156
Sa 5/257:41 pmSTL - GEG
1 stop6h 18mAlaska Airlines
Deal found 4/25$178
Sa 5/1811:39 amSTL - BOI
2 stops28h 51mSpirit Airlines
Deal found 4/25$178
Fr 5/318:35 pmSTL - BOI
3 stops24h 50mMultiple Airlines
Deal found 4/25$209
Fr 5/244:45 pmSTL - BOI
3 stops24h 19mMultiple Airlines
Deal found 4/25$211
Sa 5/185:21 amSTL - BOI
1 stop8h 24mAmerican Airlines
Deal found 4/25$224

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 3,068,117 searches. Data last updated April 26, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$103 - $366

Route

Depart

Return

Price

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

Mi 5/15

1 stop9h 20m

Boise Air Term. Gowen Fld

Di 5/28

1 stop12h 31m

$103

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

Mi 5/15

1 stop9h 20m

Boise Air Term. Gowen Fld

Mi 5/22

3 stops19h 43m

$208

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

Mi 5/15

1 stop9h 20m

Boise Air Term. Gowen Fld

Di 5/28

3 stops18h 00m

$252

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Mi 5/29

1 stop7h 15m

Spokane

Mi 6/5

1 stop9h 22m

$294

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

Mo 7/1

1 stop6h 33m

Boise Air Term. Gowen Fld

Di 7/9

1 stop7h 30m

$294

Lambert-St LouisLewiston Nez Perce Rgnl

STL - LWS

STLLWS

Lambert-St Louis

Fr 8/23

2 stops28h 01m

Lewiston Nez Perce Rgnl

Di 8/27

1 stop7h 06m

$295

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

Fr 6/21

1 stop21h 53m

Boise Air Term. Gowen Fld

Do 6/27

1 stop17h 57m

$308

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Mi 5/22

1 stop6h 18m

Spokane

Di 5/28

1 stop8h 26m

$356

Lambert-St LouisLewiston Nez Perce Rgnl

STL - LWS

STLLWS

Lambert-St Louis

Fr 8/23

1 stop7h 28m

Lewiston Nez Perce Rgnl

Di 8/27

1 stop5h 08m

$366

Flights are sorted by cheapest first

Deals found on 4/25

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 April 26, 2024.
Read through reviews of airlines operating flights from St. Louis to Idaho, such as Spirit Airlines, Delta and United 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
9,115 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

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

Alaska Airlines
8.1
Very good
9,115 reviews
Alaska Airlines
8.1
Very good
9,115 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

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

Delta
8.1
Very good
10,966 reviews
Alaska Airlines
8.1
Very good
9,115 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

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

United Airlines
7.4
Good
11,228 reviews
Alaska Airlines
8.1
Very good
9,115 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

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

American Airlines
7.3
Good
14,889 reviews
Alaska Airlines
8.1
Very good
9,115 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

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

Spirit Airlines
6.4
Okay
8,746 reviews
Alaska Airlines
8.1
Very good
9,115 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

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 $200 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Idaho for under $200. The cheapest flight booked recently is on Spirit Airlines for just $103, but on average you can expect to pay $306.

  • Are there last-minute flights available from St. Louis to Idaho for under $700?

    There are currently 12+ open flights from St. Louis to Idaho within the next 7 days for less than $700.

  • 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 Spirit Airlines ($61), Alaska Airlines ($178), and American Airlines ($224).

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

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

  • 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 4/26.

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 3,068,117 searches. Data last updated April 26, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$198Average$264FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
Alaska AirlinesCheapest$283Average$388FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
DeltaCheapest$297Average$614FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$299Average$537FlexibilityNo 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.
First Class
Business Class
Prem Econ Class
Economy 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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