$92+ Cheap flights from St. Louis to Boise (STL - BOI)
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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
May 18 — May 251
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Boise with Cheapflights
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Cheapest flights from St. Louis to BoiseExplore the most affordable flight options available from St. Louis to Boise. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 18, 2026.
Explore the most affordable flight options available from St. Louis to Boise. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 18, 2026.
This Trip.com deal was found by Cheapflights users on 4/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/97:00 am
STL
- BOI
1 stop9h 33m
Alaska Airlines
Sat 5/164:19 pm
BOI
- STL
1 stop6h 35m
Alaska Airlines
Deal found 4/17![Alaska Airlines logo]()
$302
This Expedia deal was found by Cheapflights users on 4/15. 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.
Wed 5/135:33 pm
STL
- BOI
1 stop7h 25m
Alaska Airlines
Wed 5/204:19 pm
BOI
- STL
1 stop6h 35m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$317
This Expedia deal was found by Cheapflights users on 4/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/305:37 pm
STL
- BOI
1 stop7h 11m
Multiple Airlines
Tue 7/71:04 pm
BOI
- STL
1 stop5h 19m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$349
This Expedia deal was found by Cheapflights users on 4/17. 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 7/76:02 am
STL
- BOI
1 stop9h 05m
Multiple Airlines
Tue 7/141:04 pm
BOI
- STL
1 stop5h 19m
Multiple Airlines
Deal found 4/17![Multiple Airlines logo]()
$355
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/305:25 am
STL
- BOI
1 stop6h 54m
American Airlines
Sat 6/63:11 pm
BOI
- STL
1 stop7h 45m
American Airlines
Deal found 4/15![American Airlines logo]()
$356
This American Airlines deal was found by Cheapflights users on 4/17. 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 5/267:00 am
STL
- BOI
1 stop8h 20m
American Airlines
Sat 5/303:11 pm
BOI
- STL
1 stop7h 43m
American Airlines
Deal found 4/17![American Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:35 pm
STL
- BOI
1 stop6h 55m
Southwest
Tue 6/93:00 pm
BOI
- STL
2 stops7h 40m
Southwest
Deal found 4/16![Southwest logo]()
$362
This Southwest deal was found by Cheapflights users on 4/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/138:25 am
STL
- BOI
2 stops9h 00m
Southwest
Wed 5/202:00 pm
BOI
- STL
1 stop7h 00m
Southwest
Deal found 4/15![Southwest logo]()
$380
This American Airlines deal was found by Cheapflights users on 4/16. 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 6/27:03 am
STL
- BOI
1 stop9h 04m
American Airlines
Mon 6/83:11 pm
BOI
- STL
1 stop7h 45m
American Airlines
Deal found 4/16![American Airlines logo]()
$381
This American Airlines deal was found by Cheapflights users on 4/16. 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.
Wed 6/106:00 am
STL
- BOI
1 stop9h 20m
American Airlines
Wed 6/173:11 pm
BOI
- STL
1 stop7h 45m
American Airlines
Deal found 4/16![American Airlines logo]()
$383
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:35 pm
STL
- BOI
1 stop6h 55m
Southwest
Mon 6/84:25 pm
BOI
- STL
2 stops7h 10m
Southwest
Deal found 4/16![Southwest logo]()
$386
Best flights from St. Louis to BoiseDiscover carefully curated flight deals from St. Louis to Boise that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 18, 2026.
Discover carefully curated flight deals from St. Louis to Boise that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 18, 2026.
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:35 pm
STL
- BOI
1 stop6h 55m
Southwest
Tue 6/93:00 pm
BOI
- STL
2 stops7h 40m
Southwest
Deal found 4/16![Southwest logo]()
$362
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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.
Tue 6/24:12 pm
STL
- BOI
1 stop7h 12m
Alaska Airlines
Wed 6/34:19 pm
BOI
- STL
1 stop6h 35m
Alaska Airlines
Deal found 4/16![Alaska Airlines logo]()
$428
This Delta deal was found by Cheapflights users on 4/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/33:40 pm
STL
- BOI
1 stop7h 52m
Delta
Sat 8/810:29 am
BOI
- STL
1 stop5h 22m
Delta
Deal found 4/17![Delta logo]()
$445
This United Airlines deal was found by Cheapflights users on 4/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/125:10 am
STL
- BOI
1 stop5h 35m
United Airlines
Sun 6/145:46 pm
BOI
- STL
1 stop5h 11m
United Airlines
Deal found 4/17![United Airlines logo]()
$467
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/306:55 pm
STL
- BOI
1 stop6h 30m
Southwest
Tue 7/74:05 pm
BOI
- STL
1 stop5h 05m
Southwest
Deal found 4/17![Southwest logo]()
$395
This Delta deal was found by Cheapflights users on 4/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/22:27 pm
STL
- BOI
2 stops10h 26m
Delta
Sun 6/77:53 pm
BOI
- STL
2 stops11h 49m
Delta
Deal found 4/13![Delta logo]()
$455
This Southwest deal was found by Cheapflights users on 4/13. 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.
Fri 7/246:45 pm
STL
- BOI
1 stop8h 00m
Southwest
Mon 7/273:25 pm
BOI
- STL
2 stops7h 45m
Southwest
Deal found 4/13![Southwest logo]()
$457
This Delta deal was found by Cheapflights users on 4/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/207:59 pm
STL
- BOI
1 stop5h 05m
Delta
Thu 5/289:16 pm
BOI
- STL
2 stops12h 16m
Delta
Deal found 4/15![Delta logo]()
$482
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:30 am
STL
- BOI
2 stops8h 45m
Southwest
Sun 9/277:30 am
BOI
- STL
2 stops9h 40m
Southwest
Deal found 4/17![Southwest logo]()
$497
Last-minute flights from St. Louis to BoiseDiscover last-minute flight deals from St. Louis to Boise. Data last updated April 18, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Boise. Data last updated April 18, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 4/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/97:00 am
STL
- BOI
1 stop9h 33m
Alaska Airlines
Sat 5/164:19 pm
BOI
- STL
1 stop6h 35m
Alaska Airlines
Deal found 4/17![Alaska Airlines logo]()
$302
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/94:45 pm
STL
- BOI
1 stop6h 20m
Southwest
Sat 5/1611:00 am
BOI
- STL
2 stops8h 25m
Southwest
Deal found 4/17![Southwest logo]()
$398
This Expedia deal was found by Cheapflights users on 4/15. 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.
Wed 5/135:33 pm
STL
- BOI
1 stop7h 25m
Alaska Airlines
Wed 5/204:19 pm
BOI
- STL
1 stop6h 35m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 4/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/138:25 am
STL
- BOI
2 stops9h 00m
Southwest
Wed 5/202:00 pm
BOI
- STL
1 stop7h 00m
Southwest
Deal found 4/15![Southwest logo]()
$380
This Delta deal was found by Cheapflights users on 4/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/132:27 pm
STL
- BOI
2 stops8h 46m
Delta
Wed 5/209:16 pm
BOI
- STL
2 stops12h 16m
Delta
Deal found 4/15![Delta logo]()
$405
This Expedia deal was found by Cheapflights users on 4/15. 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.
Sat 5/165:33 pm
STL
- BOI
1 stop7h 25m
Alaska Airlines
Mon 5/256:35 am
BOI
- STL
1 stop7h 41m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$421
This CheapOair deal was found by Cheapflights users on 4/13. 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.
Wed 5/207:41 pm
STL
- BOI
1 stop16h 22m
Alaska Airlines
Thu 5/289:00 am
BOI
- STL
1 stop6h 37m
Alaska Airlines
Deal found 4/13![Alaska Airlines logo]()
$401
This American Airlines deal was found by Cheapflights users on 4/17. 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 5/267:00 am
STL
- BOI
1 stop8h 20m
American Airlines
Sat 5/303:11 pm
BOI
- STL
1 stop7h 43m
American Airlines
Deal found 4/17![American Airlines logo]()
$357
This American Airlines deal was found by Cheapflights users on 4/17. 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 5/265:25 am
STL
- BOI
1 stop6h 04m
American Airlines
Tue 5/264:05 pm
BOI
- STL
1 stop6h 54m
American Airlines
Deal found 4/17![American Airlines logo]()
$402
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:35 pm
STL
- BOI
1 stop6h 55m
Southwest
Sat 5/3011:05 am
BOI
- STL
2 stops8h 15m
Southwest
Deal found 4/17![Southwest logo]()
$434
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/305:25 am
STL
- BOI
1 stop6h 54m
American Airlines
Sat 6/63:11 pm
BOI
- STL
1 stop7h 45m
American Airlines
Deal found 4/15![American Airlines logo]()
$356
This Southwest deal was found by Cheapflights users on 4/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:10 am
STL
- BOI
2 stops11h 05m
Southwest
Sat 6/65:10 pm
BOI
- STL
1 stop6h 25m
Southwest
Deal found 4/15![Southwest logo]()
$436
One-way flights from St. Louis to BoiseSearch for one-way flight options from St. Louis to Boise. Find affordable one-way fares based on user searches. Data last updated April 18, 2026.
Search for one-way flight options from St. Louis to Boise. Find affordable one-way fares based on user searches. Data last updated April 18, 2026.
This CheapOair deal was found by Cheapflights users on 4/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/98:08 pm
STL
- BOI
1 stop17h 19m
Frontier
Deal found 4/15![Frontier logo]()
$92
This CheapOair deal was found by Cheapflights users on 4/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:08 pm
STL
- BOI
1 stop17h 01m
Frontier
Deal found 4/16![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 4/15. 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.
Sat 5/98:08 pm
STL
- BOI
2 stops19h 15m
Multiple Airlines
Deal found 4/15![Multiple Airlines logo]()
$169
This American Airlines deal was found by Cheapflights users on 4/16. 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.
Wed 8/197:23 am
STL
- BOI
1 stop6h 21m
American Airlines
Deal found 4/16![American Airlines logo]()
$192
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:00 am
STL
- BOI
2 stops8h 00m
Southwest
Deal found 4/16![Southwest logo]()
$197
This CheapOair deal was found by Cheapflights users on 4/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/48:08 pm
STL
- BOI
1 stop17h 01m
Frontier
Deal found 4/16![Frontier logo]()
$201
This American Airlines deal was found by Cheapflights users on 4/16. 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 6/46:00 am
STL
- BOI
1 stop9h 20m
American Airlines
Deal found 4/16![American Airlines logo]()
$203
This American Airlines deal was found by Cheapflights users on 4/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/78:36 am
STL
- BOI
1 stop7h 12m
American Airlines
Deal found 4/14![American Airlines logo]()
$204
This United Airlines deal was found by Cheapflights users on 4/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/41:13 pm
STL
- BOI
2 stops9h 52m
United Airlines
Deal found 4/16![United Airlines logo]()
$209
This CheapOair deal was found by Cheapflights users on 4/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/38:08 pm
STL
- BOI
1 stop17h 01m
Frontier
Deal found 4/14![Frontier logo]()
$222
This Southwest deal was found by Cheapflights users on 4/14. 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.
Thu 5/148:25 am
STL
- BOI
1 stop8h 15m
Southwest
Deal found 4/14![Southwest logo]()
$223
Find flight deals from St. Louis to Boise
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Boise (BOI). 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 April 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $302 (Trip.com) |
One-way from | $92 (CheapOair) |
Popular in | February |
Cheapest in | January |
Average price | $396 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Boise 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 April 18, 2026.
Use the filters below to find and compare flights from St. Louis to Boise that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 6/2
5:35 pm-11:30 pm
1 stop6h 55m
Boise Air Term. Gowen Fld
Tue 6/9
3:00 pm-11:40 pm
2 stops7h 40m
$362
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 6/30
6:55 pm-12:25 am
1 stop6h 30m
Boise Air Term. Gowen Fld
Tue 7/7
4:05 pm-10:10 pm
1 stop5h 05m
$395
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 6/2
4:12 pm-10:24 pm
1 stop7h 12m
Boise Air Term. Gowen Fld
Wed 6/3
4:19 pm-11:54 pm
1 stop6h 35m
$428
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Mon 8/3
3:40 pm-10:32 pm
1 stop7h 52m
Boise Air Term. Gowen Fld
Sat 8/8
10:29 am-4:51 pm
1 stop5h 22m
$445
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 6/2
2:27 pm-11:53 pm
2 stops10h 26m
Boise Air Term. Gowen Fld
Sun 6/7
7:53 pm-8:42 am
2 stops11h 49m
$455
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 7/24
6:45 pm-1:45 am
1 stop8h 00m
Boise Air Term. Gowen Fld
Mon 7/27
3:25 pm-12:10 am
2 stops7h 45m
$457
Quickest round-trip
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 6/12
5:10 am-9:45 am
1 stop5h 35m
Boise Air Term. Gowen Fld
Sun 6/14
5:46 pm-11:57 pm
1 stop5h 11m
$467
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Wed 5/20
7:59 pm-12:04 am
1 stop5h 05m
Boise Air Term. Gowen Fld
Thu 5/28
9:16 pm-10:32 am
2 stops12h 16m
$482
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Thu 9/24
8:30 am-4:15 pm
2 stops8h 45m
Boise Air Term. Gowen Fld
Sun 9/27
7:30 am-6:10 pm
2 stops9h 40m
$497
Cheapest one-way
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sat 5/9
8:08 pm-12:27 pm
1 stop17h 19m
$92
Showing 1-10 of 18 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Boise
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 St. Louis to Boise in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on St. Louis-Boise flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Boise flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Boise flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Boise 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 St. Louis-Boise 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 St. Louis to Boise
Have a flexible travel schedule? Discover the best time to fly to Boise from St. Louis with our price prediction graph.
STL-BOI
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 St. Louis to Boise
Prices
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How far ahead should I book a flight from St. Louis to Boise?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Boise. Price data was last updated on April 10, 2026.
The price you pay for your flight from St. Louis to Boise may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from St. Louis to Boise?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Boise (average of $359). Flying from St. Louis to Boise in February is currently the most expensive (average of $566). 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.
How much does it cost to fly round-trip from St. Louis to Boise?
What’s the top layover airport for flights from St. Louis to Boise?
Share of 1-stop round-trip flights from St. Louis to Boise chosen by Cheapflights users in the past 12 months, using the same layover each way.
Denver (DEN) – chosen by Cheapflights users on 80% of 1-stop itineraries from St. Louis to Boise on Cheapflights.
What’s the cheapest layover airport for flights from St. Louis to Boise?
Average round-trip fare for 1-stop flights from St. Louis to Boise, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Seattle (SEA) is the most affordable 1-stop option, with an average round-trip price of $395.
What’s the fastest layover option from St. Louis to Boise?
Shortest average travel time for 1-stop one-way flights from St. Louis to Boise, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 5h 10m.
Which airport typically offers the quickest layover for flights from St. Louis to Boise?
Average layover duration for 1-stop one-way flights from St. Louis to Boise, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 1h 06m.
Reviews of airlines servicing Boise
Get insights into the airlines that provide service to Boise. 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 Boise. Reviews last updated April 18, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from St. Louis to Boise. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Boise. 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 Boise?
Book flights to Boise if you plan to visit one of these locationsOntario
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St. Louis and Boise flights
Browse other St. Louis and Boise flight options. Last updated on April 18, 2026.
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Top 4 airlines flying from St. Louis to Boise
Discover the top 4 airlines that operate flights from St. Louis to Boise. 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 April 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$186 | Average$366 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$237 | Average$366 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$296 | Average$436 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$338 | Average$457 | FlexibilityNo cancel fee | On-time69% |