$139+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Mar 24 — Mar 311
1 adult, Economy
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Find cheap flights from St. Louis to Boise 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
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Best
Last-minute
One-way
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 February 22, 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 February 22, 2026.
This United Airlines deal was found by Cheapflights users on 2/20. 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 4/42:40 pm
STL
- BOI
1 stop7h 54m
United Airlines
Wed 4/82:37 pm
BOI
- STL
1 stop5h 17m
United Airlines
Deal found 2/20![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 2/19. 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.
Sun 4/52:12 pm
STL
- BOI
2 stops10h 34m
Delta
Sat 4/119:00 am
BOI
- STL
2 stops11h 31m
Delta
Deal found 2/19![Delta logo]()
$280
This Delta deal was found by Cheapflights users on 2/19. 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.
Fri 5/12:20 pm
STL
- BOI
2 stops10h 57m
Delta
Mon 5/410:41 am
BOI
- STL
2 stops12h 44m
Delta
Deal found 2/19![Delta logo]()
$286
This Delta deal was found by Cheapflights users on 2/19. 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.
Fri 4/172:20 pm
STL
- BOI
2 stops9h 04m
Delta
Mon 4/275:40 am
BOI
- STL
2 stops10h 46m
Delta
Deal found 2/19![Delta logo]()
$310
This Kiwi.com deal was found by Cheapflights users on 2/19. 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.
Wed 3/258:12 pm
STL
- BOI
1 stop16h 08m
Multiple Airlines
Thu 3/265:20 pm
BOI
- STL
2 stops16h 59m
Multiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$318
This Delta deal was found by Cheapflights users on 2/20. 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.
Sat 4/46:29 am
STL
- BOI
2 stops13h 14m
Delta
Wed 4/81:45 pm
BOI
- STL
2 stops9h 36m
Delta
Deal found 2/20![Delta logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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.
Sun 4/54:20 pm
STL
- BOI
1 stop19h 01m
Alaska Airlines
Sat 4/118:20 am
BOI
- STL
1 stop14h 39m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$340
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Sun 4/54:13 pm
STL
- BOI
1 stop7h 10m
American Airlines
Sat 4/111:29 pm
BOI
- STL
1 stop7h 48m
American Airlines
Deal found 2/20![American Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 2/20. 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 4/411:15 am
STL
- BOI
2 stops11h 19m
United Airlines
Sun 4/56:15 am
BOI
- STL
1 stop5h 53m
United Airlines
Deal found 2/20![United Airlines logo]()
$349
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 February 22, 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 February 22, 2026.
This Delta deal was found by Cheapflights users on 2/19. 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.
Sun 4/52:12 pm
STL
- BOI
2 stops10h 34m
Delta
Sat 4/119:00 am
BOI
- STL
2 stops11h 31m
Delta
Deal found 2/19![Delta logo]()
$280
This United Airlines deal was found by Cheapflights users on 2/20. 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 4/411:15 am
STL
- BOI
2 stops11h 19m
United Airlines
Wed 4/82:37 pm
BOI
- STL
1 stop5h 17m
United Airlines
Deal found 2/20![United Airlines logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 2/19. 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.
Wed 3/258:12 pm
STL
- BOI
1 stop16h 08m
Multiple Airlines
Thu 3/265:20 pm
BOI
- STL
2 stops16h 59m
Multiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$318
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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.
Sun 4/54:20 pm
STL
- BOI
1 stop19h 01m
Alaska Airlines
Sat 4/118:20 am
BOI
- STL
1 stop14h 39m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$340
This Delta deal was found by Cheapflights users on 2/19. 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.
Fri 4/172:20 pm
STL
- BOI
2 stops9h 04m
Delta
Mon 4/275:40 am
BOI
- STL
2 stops10h 46m
Delta
Deal found 2/19![Delta logo]()
$310
This flugladen.de deal was found by Cheapflights users on 2/19. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/54:20 pm
STL
- BOI
1 stop7h 37m
Multiple Airlines
Sun 4/1212:03 pm
BOI
- STL
2 stops34h 22m
Multiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$344
This Alaska Airlines deal was found by Cheapflights users on 2/21. 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.
Fri 4/177:00 am
STL
- BOI
1 stop16h 57m
Alaska Airlines
Mon 4/276:08 pm
BOI
- STL
1 stop28h 51m
Alaska Airlines
Deal found 2/21![Alaska Airlines logo]()
$353
This Delta deal was found by Cheapflights users on 2/19. 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.
Fri 5/12:20 pm
STL
- BOI
2 stops10h 57m
Delta
Mon 5/48:30 am
BOI
- STL
1 stop7h 56m
Delta
Deal found 2/19![Delta logo]()
$351
Last-minute flights from St. Louis to BoiseDiscover last-minute flight deals from St. Louis to Boise. Data last updated February 22, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Boise. Data last updated February 22, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Sun 3/85:12 am
STL
- BOI
1 stop8h 36m
American Airlines
Wed 3/111:39 pm
BOI
- STL
1 stop8h 19m
American Airlines
Deal found 2/20![American Airlines logo]()
$547
This Delta deal was found by Cheapflights users on 2/19. 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.
Sun 3/86:12 pm
STL
- BOI
1 stop4h 59m
Delta
Wed 3/1110:35 am
BOI
- STL
2 stops12h 46m
Delta
Deal found 2/19![Delta logo]()
$581
This United Airlines deal was found by Cheapflights users on 2/20. 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 3/85:15 am
STL
- BOI
1 stop5h 51m
United Airlines
Wed 3/115:00 am
BOI
- STL
2 stops8h 42m
United Airlines
Deal found 2/20![United Airlines logo]()
$587
This CheapOair deal was found by Cheapflights users on 2/20. 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.
Tue 3/107:00 am
STL
- BOI
1 stop9h 08m
Alaska Airlines
Thu 3/126:28 am
BOI
- STL
1 stop6h 23m
Alaska Airlines
Deal found 2/20![Alaska Airlines logo]()
$604
This Kiwi.com deal was found by Cheapflights users on 2/21. 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.
Fri 3/138:12 pm
STL
- BOI
2 stops42h 49m
Multiple Airlines
Thu 3/1912:15 pm
BOI
- STL
1 stop20h 34m
Multiple Airlines
Deal found 2/21![Multiple Airlines logo]()
$584
This Delta deal was found by Cheapflights users on 2/21. 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.
Fri 3/136:29 am
STL
- BOI
2 stops10h 31m
Delta
Thu 3/197:30 pm
BOI
- STL
2 stops12h 31m
Delta
Deal found 2/21![Delta logo]()
$610
This Delta deal was found by Cheapflights users on 2/21. 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 3/166:12 pm
STL
- BOI
1 stop4h 59m
Delta
Thu 3/197:30 pm
BOI
- STL
2 stops12h 31m
Delta
Deal found 2/21![Delta logo]()
$555
This Southwest deal was found by Cheapflights users on 2/21. 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 3/165:20 pm
STL
- BOI
2 stops9h 00m
Southwest
Thu 3/198:15 pm
BOI
- STL
2 stops14h 25m
Southwest
Deal found 2/21![Southwest logo]()
$590
This Kiwi.com deal was found by Cheapflights users on 2/19. 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.
Wed 3/258:12 pm
STL
- BOI
1 stop16h 08m
Multiple Airlines
Thu 3/265:20 pm
BOI
- STL
2 stops16h 59m
Multiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$318
This Southwest deal was found by Cheapflights users on 2/19. 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 3/256:30 pm
STL
- BOI
1 stop7h 00m
Southwest
Thu 3/264:20 pm
BOI
- STL
1 stop6h 25m
Southwest
Deal found 2/19![Southwest logo]()
$358
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 February 22, 2026.
Search for one-way flight options from St. Louis to Boise. Find affordable one-way fares based on user searches. Data last updated February 22, 2026.
This American Airlines deal was found by Cheapflights users on 2/19. 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 4/287:05 am
STL
- BOI
1 stop6h 44m
American Airlines
Deal found 2/19![American Airlines logo]()
$139
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Tue 4/288:54 am
STL
- BOI
2 stops8h 54m
United Airlines
Deal found 2/19![United Airlines logo]()
$144
This CheapOair deal was found by Cheapflights users on 2/22. 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 3/148:12 pm
STL
- BOI
1 stop16h 08m
Frontier
Deal found 2/22![Frontier logo]()
$147
This United Airlines deal was found by Cheapflights users on 2/21. 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.
Mon 3/165:55 pm
STL
- BOI
1 stop5h 48m
United Airlines
Deal found 2/21![United Airlines logo]()
$164
This American Airlines deal was found by Cheapflights users on 2/21. 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 5/205:51 am
STL
- BOI
1 stop7h 58m
American Airlines
Deal found 2/21![American Airlines logo]()
$174
This American Airlines deal was found by Cheapflights users on 2/20. 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 7/75:45 am
STL
- BOI
1 stop6h 44m
American Airlines
Deal found 2/20![American Airlines logo]()
$184
This Delta deal was found by Cheapflights users on 2/21. 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 4/202:20 pm
STL
- BOI
2 stops10h 57m
Delta
Deal found 2/21![Delta logo]()
$188
This American Airlines deal was found by Cheapflights users on 2/21. 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.
Mon 4/207:05 am
STL
- BOI
1 stop6h 44m
American Airlines
Deal found 2/21![American Airlines logo]()
$189
This Southwest deal was found by Cheapflights users on 2/21. 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 4/205:15 pm
STL
- BOI
2 stops8h 30m
Southwest
Deal found 2/21![Southwest logo]()
$194
This Alaska Airlines deal was found by Cheapflights users on 2/21. 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 7/72:24 pm
STL
- BOI
2 stops10h 21m
Alaska Airlines
Deal found 2/21![Alaska Airlines logo]()
$239
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 February 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $277 (United Airlines) |
One-way from | $139 (American Airlines) |
Popular in | February |
Cheapest in | January |
Average price | $566 |
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 February 22, 2026.
Use the filters below to find and compare flights from St. Louis to Boise that are best for you.
Fly from
St. Louis
Fly to
Boise
Route
Depart
Return
Price
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sun 4/5
2:12 pm-11:46 pm
2 stops10h 34m
Boise Air Term. Gowen Fld
Sat 4/11
9:00 am-9:31 pm
2 stops11h 31m
$280
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sat 4/4
11:15 am-9:34 pm
2 stops11h 19m
Boise Air Term. Gowen Fld
Wed 4/8
2:37 pm-8:54 pm
1 stop5h 17m
$282
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 4/17
2:20 pm-10:24 pm
2 stops9h 04m
Boise Air Term. Gowen Fld
Mon 4/27
5:40 am-5:26 pm
2 stops10h 46m
$310
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Wed 3/25
8:12 pm-11:20 am
1 stop16h 08m
Boise Air Term. Gowen Fld
Thu 3/26
5:20 pm-11:19 am
2 stops16h 59m
$318
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sun 4/5
4:20 pm-10:21 am
1 stop19h 01m
Boise Air Term. Gowen Fld
Sat 4/11
8:20 am-11:59 pm
1 stop14h 39m
$340
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sun 4/5
4:20 pm-10:57 pm
1 stop7h 37m
Boise Air Term. Gowen Fld
Sun 4/12
12:03 pm-11:25 pm
2 stops34h 22m
$344
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 5/1
2:20 pm-12:17 am
2 stops10h 57m
Boise Air Term. Gowen Fld
Mon 5/4
8:30 am-5:26 pm
1 stop7h 56m
$351
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 4/17
7:00 am-10:57 pm
1 stop16h 57m
Boise Air Term. Gowen Fld
Mon 4/27
6:08 pm-11:59 pm
1 stop28h 51m
$353
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 7/7
5:45 am-11:29 am
1 stop6h 44m
$184
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Mon 4/20
5:15 pm-12:45 am
2 stops8h 30m
$194
Showing 1-10 of 15 results
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 February.
| 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
More
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 February 20, 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, September is the cheapest month in which you can book a flight from St. Louis to Boise (average of $186). Flying from St. Louis to Boise in February is currently the most expensive (average of $380). 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.
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 February 22, 2026.
Read reviews from past customers who have flown Southwest, Delta, and United 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.
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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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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 February 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$186 | Average$366 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$237 | Average$362 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$292 | Average$421 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$338 | Average$476 | FlexibilityNo cancel fee | On-time69% |