$111+ Cheap flights from Boise to St. Louis (BOI - STL)
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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Sep 16 — Sep 231
Round-trip
1 adult, Economy
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Find cheap flights from Boise to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Boise to St. Louis
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Best
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One-way
Cheapest flights from Boise to St. LouisExplore the most affordable flight options available from Boise to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 17, 2026.
Explore the most affordable flight options available from Boise to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 17, 2026.
This Priceline deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/123:52 pm -
1 stop8h 25m
Fri 10/234:42 pm -
1 stop8h 17m
Deal found 8/12![Multiple Airlines logo]()
$263
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/72:02 pm -
1 stop5h 41m
Wed 10/146:32 am -
1 stop8h 19m
Deal found 8/12![American Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/52:58 pm -
1 stop8h 00m
Tue 9/85:42 am -
1 stop6h 34m
Deal found 8/13![American Airlines logo]()
$271
This Alaska Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:18 pm -
1 stop6h 41m
Mon 11/27:00 am -
1 stop9h 27m
Deal found 8/12![Alaska Airlines logo]()
$299
This CheapOair deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:50 pm -
1 stop19h 27m
Sun 9/1312:27 pm -
1 stop26h 28m
Deal found 8/13![Frontier logo]()
$307
This CheapOair deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/112:50 pm -
1 stop19h 42m
Sun 9/1312:27 pm -
1 stop26h 28m
Deal found 8/13![Frontier logo]()
$322
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:50 pm -
2 stops14h 00m
Fri 10/235:05 am -
2 stops9h 15m
Deal found 8/12![Southwest logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:18 pm -
1 stop6h 41m
Sat 10/246:02 am -
1 stop7h 33m
Deal found 8/16![Alaska Airlines logo]()
$369
Best flights from Boise to St. LouisDiscover carefully curated flight deals from Boise to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 17, 2026.
Discover carefully curated flight deals from Boise to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 17, 2026.
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/72:02 pm -
1 stop5h 41m
Wed 10/146:32 am -
1 stop8h 19m
Deal found 8/12![American Airlines logo]()
$269
This Alaska Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:18 pm -
1 stop6h 41m
Sat 10/246:02 am -
1 stop7h 33m
Deal found 8/13![Alaska Airlines logo]()
$269
This Orbitz deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/123:52 pm -
1 stop8h 25m
Fri 10/236:04 am -
2 stops12h 03m
Deal found 8/12![Multiple Airlines logo]()
$318
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:50 pm -
2 stops14h 00m
Fri 10/235:05 am -
2 stops9h 15m
Deal found 8/12![Southwest logo]()
$347
This United Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:00 am -
2 stops9h 43m
Mon 11/24:39 pm -
1 stop7h 20m
Deal found 8/12![United Airlines logo]()
$394
This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/51:55 pm -
2 stops8h 47m
Tue 9/85:42 am -
1 stop6h 34m
Deal found 8/13![American Airlines logo]()
$276
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/24:45 pm -
1 stop5h 35m
Mon 10/55:05 am -
1 stop7h 15m
Deal found 8/14![Southwest logo]()
$391
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/132:25 pm -
1 stop8h 30m
Sun 10/186:20 am -
1 stop5h 20m
Deal found 8/13![Southwest logo]()
$393
This Alaska Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/104:20 pm -
1 stop6h 39m
Sun 9/136:29 am -
1 stop7h 06m
Deal found 8/17![Alaska Airlines logo]()
$443
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/103:21 pm -
1 stop8h 06m
Sun 9/137:00 am -
1 stop7h 00m
Deal found 8/16![American Airlines logo]()
$443
Last-minute flights from Boise to St. LouisDiscover last-minute flight deals from Boise to St. Louis. Data last updated August 17, 2026 and is based on user searches.
Discover last-minute flight deals from Boise to St. Louis. Data last updated August 17, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/32:49 pm -
1 stop7h 53m
Sun 9/69:32 am -
1 stop5h 57m
Deal found 8/12![American Airlines logo]()
$320
This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/52:58 pm -
1 stop8h 00m
Tue 9/85:42 am -
1 stop6h 34m
Deal found 8/13![American Airlines logo]()
$271
This CheapOair deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:50 pm -
1 stop19h 27m
Sun 9/1312:27 pm -
1 stop26h 28m
Deal found 8/12![Frontier logo]()
$255
This CheapOair deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/112:50 pm -
1 stop19h 42m
Sun 9/1312:27 pm -
1 stop26h 28m
Deal found 8/13![Frontier logo]()
$322
This Expedia deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:25 pm -
1 stop19h 45m
Sun 9/276:29 am -
1 stop7h 06m
Deal found 8/17![Alaska Airlines logo]()
$423
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/221:52 pm -
2 stops9h 35m
Sun 9/277:00 am -
1 stop7h 00m
Deal found 8/17![American Airlines logo]()
$428
This Expedia deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:20 pm -
1 stop6h 39m
Mon 9/283:19 pm -
1 stop8h 19m
Deal found 8/14![Alaska Airlines logo]()
$396
One-way flights from Boise to St. LouisSearch for one-way flight options from Boise to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 17, 2026.
Search for one-way flight options from Boise to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/81:24 pm -
1 stop28h 53m
Deal found 8/12![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/142:50 pm -
1 stop19h 42m
Deal found 8/15![Frontier logo]()
$117
This United Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1212:30 pm -
1 stop8h 03m
Deal found 8/13![United Airlines logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/122:50 pm -
2 stops47h 34m
Deal found 8/13![Frontier logo]()
$158
This Priceline deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3012:24 pm -
1 stop5h 49m
Deal found 8/15![Frontier logo]()
$179
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/151:52 pm -
1 stop6h 00m
Deal found 8/16![American Airlines logo]()
$185
This Expedia deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2312:24 pm -
1 stop5h 49m
Deal found 8/15![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/124:37 pm -
3 stops48h 03m
Deal found 8/13![Multiple Airlines logo]()
$273
This United Airlines deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/305:00 am -
2 stops8h 57m
Deal found 8/15![United Airlines logo]()
$304
Find flight deals from Boise to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) 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 August 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $255 (CheapOair) |
One-way from | $111 (Kiwi.com) |
Popular in | March |
Cheapest in | September |
Average price | $466 |
Cheapflights Fare Finder
Customize your flight search to find flights from Boise 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 2,558,603 searches. Data last updated August 17, 2026.
Use the filters below to find and compare flights from Boise to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Wed 10/7
2:02 pm-8:43 pm
1 stop5h 41m
Lambert-St Louis
Wed 10/14
6:32 am-1:51 pm
1 stop8h 19m
$269
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Wed 10/21
4:18 pm-11:59 pm
1 stop6h 41m
Lambert-St Louis
Sat 10/24
6:02 am-12:35 pm
1 stop7h 33m
$269
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Sat 9/5
1:55 pm-11:42 pm
2 stops8h 47m
Lambert-St Louis
Tue 9/8
5:42 am-11:16 am
1 stop6h 34m
$276
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Mon 10/12
3:52 pm-1:17 am
1 stop8h 25m
Lambert-St Louis
Fri 10/23
6:04 am-5:07 pm
2 stops12h 03m
$318
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Mon 10/12
6:50 pm-9:50 am
2 stops14h 00m
Lambert-St Louis
Fri 10/23
5:05 am-1:20 pm
2 stops9h 15m
$347
Quickest round-trip
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Fri 10/2
4:45 pm-11:20 pm
1 stop5h 35m
Lambert-St Louis
Mon 10/5
5:05 am-11:20 am
1 stop7h 15m
$391
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Tue 10/13
2:25 pm-11:55 pm
1 stop8h 30m
Lambert-St Louis
Sun 10/18
6:20 am-10:40 am
1 stop5h 20m
$393
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Thu 10/29
5:00 am-3:43 pm
2 stops9h 43m
Lambert-St Louis
Mon 11/2
4:39 pm-10:59 pm
1 stop7h 20m
$394
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Thu 9/10
4:20 pm-11:59 pm
1 stop6h 39m
Lambert-St Louis
Sun 9/13
6:29 am-12:35 pm
1 stop7h 06m
$443
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Thu 9/10
3:21 pm-12:27 am
1 stop8h 06m
Lambert-St Louis
Sun 9/13
7:00 am-1:00 pm
1 stop7h 00m
$443
Showing 1-10 of 18 resultsSorted by cheapest first
Compare providers for flights from Boise to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boise to St. Louis in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Boise-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boise-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boise-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Boise-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boise-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Boise to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Boise with our price prediction graph.
BOI-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Boise to St. Louis
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 August 17, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from Boise 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.
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Related info for your journey
Find useful and relevant information for your journey from Boise to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington
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Boise and St. Louis flights
Browse other Boise and St. Louis flight options. Last updated on August 17, 2026.
Other flights from Boise
Browse through other flights departing from Boise. Flights are based on user searches made on Cheapflights and were last updated on August 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 17, 2026.
Top 3 airlines flying from Boise to St. Louis
Discover the top 3 airlines that operate flights from Boise 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 2,558,603 searches. Data last updated August 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$260 | Average$447 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$283 | Average$466 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$347 | Average$522 | FlexibilityNo cancel fee | On-time63% |