$95+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Apr 12 — Apr 191
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
Best
Last-minute
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 March 13, 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 March 13, 2026.
This CheapTickets deal was found by Cheapflights users on 3/10. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/152:22 pm
BOI
- STL
1 stop8h 37m
Multiple Airlines
Wed 4/227:00 am
STL
- BOI
1 stop9h 33m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 3/11. 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 4/218:30 am
BOI
- STL
1 stop7h 56m
Delta
Tue 4/284:41 pm
STL
- BOI
1 stop6h 47m
Delta
Deal found 3/11![Delta logo]()
$277
This Trip.com deal was found by Cheapflights users on 3/8. 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.
Wed 4/222:57 pm
BOI
- STL
1 stop8h 02m
Alaska Airlines
Wed 4/297:00 am
STL
- BOI
1 stop9h 33m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 3/10. 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 4/153:15 pm
BOI
- STL
1 stop5h 30m
Southwest
Wed 4/226:35 am
STL
- BOI
2 stops7h 45m
Southwest
Deal found 3/10![Southwest logo]()
$282
This Delta deal was found by Cheapflights users on 3/9. 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 4/221:52 pm
BOI
- STL
2 stops9h 33m
Delta
Wed 4/292:20 pm
STL
- BOI
2 stops9h 04m
Delta
Deal found 3/9![Delta logo]()
$287
This Southwest deal was found by Cheapflights users on 3/8. 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 4/74:05 pm
BOI
- STL
1 stop6h 10m
Southwest
Tue 4/148:25 am
STL
- BOI
2 stops9h 00m
Southwest
Deal found 3/8![Southwest logo]()
$292
This Delta deal was found by Cheapflights users on 3/10. 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 4/151:52 pm
BOI
- STL
2 stops8h 22m
Delta
Wed 4/222:20 pm
STL
- BOI
2 stops10h 57m
Delta
Deal found 3/10![Delta logo]()
$294
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 4/142:22 pm
BOI
- STL
1 stop8h 37m
Alaska Airlines
Wed 4/157:00 am
STL
- BOI
1 stop7h 58m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 3/10. 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 4/82:00 pm
BOI
- STL
1 stop7h 00m
Southwest
Wed 4/155:30 am
STL
- BOI
2 stops12h 10m
Southwest
Deal found 3/10![Southwest logo]()
$298
This Southwest deal was found by Cheapflights users on 3/9. 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 4/111:10 am
BOI
- STL
2 stops9h 15m
Southwest
Wed 4/88:35 am
STL
- BOI
1 stop7h 50m
Southwest
Deal found 3/9![Southwest logo]()
$313
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 March 13, 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 March 13, 2026.
This Southwest deal was found by Cheapflights users on 3/10. 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 4/83:15 pm
BOI
- STL
1 stop6h 55m
Southwest
Wed 4/156:35 am
STL
- BOI
1 stop5h 20m
Southwest
Deal found 3/10![Southwest logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 3/7. 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 4/142:22 pm
BOI
- STL
1 stop8h 37m
Alaska Airlines
Wed 4/157:00 am
STL
- BOI
1 stop7h 58m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$295
This Delta deal was found by Cheapflights users on 3/8. 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 5/89:16 pm
BOI
- STL
2 stops12h 16m
Delta
Mon 5/112:27 pm
STL
- BOI
2 stops10h 28m
Delta
Deal found 3/8![Delta logo]()
$322
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/147:11 am
BOI
- STL
2 stops12h 43m
United Airlines
Wed 4/158:54 am
STL
- BOI
2 stops12h 19m
United Airlines
Deal found 3/10![United Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 3/10. 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 4/212:00 pm
BOI
- STL
1 stop7h 00m
Southwest
Tue 4/288:25 am
STL
- BOI
2 stops9h 00m
Southwest
Deal found 3/10![Southwest logo]()
$282
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 4/2210:02 am
BOI
- STL
1 stop12h 57m
Alaska Airlines
Wed 4/297:00 am
STL
- BOI
1 stop9h 33m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 3/10. 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 4/153:15 pm
BOI
- STL
1 stop5h 30m
Southwest
Wed 4/226:35 am
STL
- BOI
2 stops7h 45m
Southwest
Deal found 3/10![Southwest logo]()
$282
This Delta deal was found by Cheapflights users on 3/8. 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 4/66:15 pm
BOI
- STL
1 stop5h 06m
Delta
Mon 4/136:45 pm
STL
- BOI
2 stops16h 16m
Delta
Deal found 3/8![Delta logo]()
$336
Last-minute flights from Boise to St. LouisDiscover last-minute flight deals from Boise to St. Louis. Data last updated March 13, 2026 and is based on user searches.
Discover last-minute flight deals from Boise to St. Louis. Data last updated March 13, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 3/9. 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 4/111:10 am
BOI
- STL
2 stops9h 15m
Southwest
Wed 4/88:35 am
STL
- BOI
1 stop7h 50m
Southwest
Deal found 3/9![Southwest logo]()
$313
This Southwest deal was found by Cheapflights users on 3/8. 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 4/74:05 pm
BOI
- STL
1 stop6h 10m
Southwest
Tue 4/148:25 am
STL
- BOI
2 stops9h 00m
Southwest
Deal found 3/8![Southwest logo]()
$292
This Southwest deal was found by Cheapflights users on 3/10. 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 4/82:00 pm
BOI
- STL
1 stop7h 00m
Southwest
Wed 4/155:30 am
STL
- BOI
2 stops12h 10m
Southwest
Deal found 3/10![Southwest logo]()
$298
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 4/142:22 pm
BOI
- STL
1 stop8h 37m
Alaska Airlines
Wed 4/157:00 am
STL
- BOI
1 stop7h 58m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$295
This CheapTickets deal was found by Cheapflights users on 3/10. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/152:22 pm
BOI
- STL
1 stop8h 37m
Multiple Airlines
Wed 4/227:00 am
STL
- BOI
1 stop9h 33m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 3/10. 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 4/153:15 pm
BOI
- STL
1 stop5h 30m
Southwest
Wed 4/226:35 am
STL
- BOI
2 stops7h 45m
Southwest
Deal found 3/10![Southwest logo]()
$282
This Delta deal was found by Cheapflights users on 3/10. 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 4/151:52 pm
BOI
- STL
2 stops8h 22m
Delta
Wed 4/222:20 pm
STL
- BOI
2 stops10h 57m
Delta
Deal found 3/10![Delta logo]()
$294
This Delta deal was found by Cheapflights users on 3/11. 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 4/218:30 am
BOI
- STL
1 stop7h 56m
Delta
Tue 4/284:41 pm
STL
- BOI
1 stop6h 47m
Delta
Deal found 3/11![Delta logo]()
$277
This Trip.com deal was found by Cheapflights users on 3/8. 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.
Wed 4/222:57 pm
BOI
- STL
1 stop8h 02m
Alaska Airlines
Wed 4/297:00 am
STL
- BOI
1 stop9h 33m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 3/9. 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 4/221:52 pm
BOI
- STL
2 stops9h 33m
Delta
Wed 4/292:20 pm
STL
- BOI
2 stops9h 04m
Delta
Deal found 3/9![Delta logo]()
$287
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 March 13, 2026.
Search for one-way flight options from Boise to St. Louis. Find affordable one-way fares based on user searches. Data last updated March 13, 2026.
This Frontier deal was found by Cheapflights users on 3/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/711:53 am
BOI
- STL
1 stop6h 19m
Frontier
Deal found 3/9![Frontier logo]()
$95
This United Airlines deal was found by Cheapflights users on 3/11. 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 5/162:33 pm
BOI
- STL
1 stop5h 10m
United Airlines
Deal found 3/11![United Airlines logo]()
$139
This Alaska Airlines deal was found by Cheapflights users on 3/7. 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.
Sat 4/118:20 am
BOI
- STL
1 stop14h 39m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$144
This Priceline deal was found by Cheapflights users on 3/8. 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.
Thu 5/1411:53 am
BOI
- STL
1 stop6h 19m
Frontier
Deal found 3/8![Frontier logo]()
$145
This American Airlines deal was found by Cheapflights users on 3/8. 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 4/111:53 pm
BOI
- STL
1 stop8h 06m
American Airlines
Deal found 3/8![American Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 3/9. 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 5/410:41 am
BOI
- STL
2 stops12h 44m
Delta
Deal found 3/9![Delta logo]()
$164
This Delta deal was found by Cheapflights users on 3/11. 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 4/115:52 am
BOI
- STL
2 stops10h 16m
Delta
Deal found 3/11![Delta logo]()
$167
This United Airlines deal was found by Cheapflights users on 3/8. 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 5/128:02 am
BOI
- STL
2 stops12h 11m
United Airlines
Deal found 3/8![United Airlines logo]()
$184
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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.
Mon 5/44:38 pm
BOI
- STL
1 stop6h 21m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$193
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 March 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $257 (CheapTickets) |
One-way from | $95 (Frontier) |
Popular in | November |
Cheapest in | September |
Average price | $471 |
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 March 13, 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
Quickest round-trip
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Wed 4/8
3:15 pm-11:10 pm
1 stop6h 55m
Lambert-St Louis
Wed 4/15
6:35 am-10:55 am
1 stop5h 20m
$277
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 4/21
2:00 pm-10:00 pm
1 stop7h 00m
Lambert-St Louis
Tue 4/28
8:25 am-4:25 pm
2 stops9h 00m
$282
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Wed 4/15
3:15 pm-9:45 pm
1 stop5h 30m
Lambert-St Louis
Wed 4/22
6:35 am-1:20 pm
2 stops7h 45m
$282
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 4/14
2:22 pm-11:59 pm
1 stop8h 37m
Lambert-St Louis
Wed 4/15
7:00 am-1:58 pm
1 stop7h 58m
$295
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Wed 4/22
10:02 am-11:59 pm
1 stop12h 57m
Lambert-St Louis
Wed 4/29
7:00 am-3:33 pm
1 stop9h 33m
$295
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Fri 5/8
9:16 pm-10:32 am
2 stops12h 16m
Lambert-St Louis
Mon 5/11
2:27 pm-11:55 pm
2 stops10h 28m
$322
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Mon 4/6
6:15 pm-12:21 am
1 stop5h 06m
Lambert-St Louis
Mon 4/13
6:45 pm-10:01 am
2 stops16h 16m
$336
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 4/14
7:11 am-8:54 pm
2 stops12h 43m
Lambert-St Louis
Wed 4/15
8:54 am-8:13 pm
2 stops12h 19m
$368
Cheapest one-way
Quickest one-way
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Sat 5/16
2:33 pm-8:43 pm
1 stop5h 10m
$139
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 5/5
4:38 pm-11:59 pm
1 stop6h 21m
$139
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 March.
| 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 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
Prices
More
How far ahead should I book a flight from Boise to St. Louis?
Use this chart to determine the optimal time to book a round-trip flight from Boise to St. Louis. Price data was last updated on March 6, 2026.
To ensure you get the cheapest price possible for a flight from Boise to St. Louis, you should look to book at least 36 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Boise to St. Louis?
Currently, April is the cheapest month in which you can book a flight from Boise to St. Louis (average of $113). Flying from Boise to St. Louis in February is currently the most expensive (average of $376). 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 Boise to St. Louis?
Share of 1-stop round-trip flights from Boise to St. Louis chosen by Cheapflights users in the past 12 months, using the same layover each way.
Denver (DEN) – chosen by Cheapflights users on 67% of 1-stop itineraries from Boise to St. Louis on Cheapflights.
What’s the cheapest layover airport for flights from Boise to St. Louis?
Average round-trip fare for 1-stop flights from Boise to St. Louis, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $506.
What’s the fastest layover option from Boise to St. Louis?
Shortest average travel time for 1-stop one-way flights from Boise to St. Louis, 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: 4h 55m.
Which airport typically offers the quickest layover for flights from Boise to St. Louis?
Average layover duration for 1-stop one-way flights from Boise to St. Louis, 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 45m.
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 March 13, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Southwest, andDelta 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.
Overall
8.0
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
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
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Boise
Popular flights
St. Louis flight routes
Alternative routes for Boise to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Boise to St. Louis by cabin class
Find flights from Boise to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Boise and St. Louis flights
Browse other Boise and St. Louis flight options. Last updated on March 13, 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 March 13, 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 March 13, 2026.
Top 5 airlines flying from Boise to St. Louis
Discover the top 5 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 March 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$143 | Average$342 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$278 | Average$428 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$278 | Average$372 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$281 | Average$470 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$286 | Average$391 | FlexibilityNo cancel fee | On-time69% |