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Cheap flights from St. Louis to Boise from $139

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Boise departing on 9/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from St. Louis to Boise

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:58 pm - 12:29 pm-
17h 31m
Frontier Logo
2:50 pm - 11:32 am-
19h 42m
$285Frontier
Mon, Sep 7 - Mon, Sep 14
Frontier Logo
7:58 pm - 12:29 pm-
17h 31m
Frontier Logo
2:50 pm - 11:32 am-
19h 42m
$287Frontier
Mon, Sep 7 - Mon, Sep 14
Southwest Logo
6:05 pm - 10:40 pm-
5h 35m
Southwest Logo
2:55 pm - 11:15 pm-
7h 20m
$369Southwest
Fri, Sep 11 - Thu, Sep 24
Southwest Logo
6:00 pm - 11:55 pm-
6h 55m
Southwest Logo
3:25 pm - 10:25 pm-
6h 00m
$369Southwest
Fri, Sep 11 - Sat, Sep 12
American Airlines Logo
8:00 am - 1:24 pm-
6h 24m
American Airlines Logo
1:55 pm - 12:14 am-
9h 19m
$374American Airlines
Thu, Aug 27 - Mon, Aug 31
American Airlines Logo
7:29 am - 2:33 pm-
8h 04m
American Airlines Logo
8:00 am - 6:20 pm-
9h 20m
$374American Airlines
Thu, Oct 22 - Sat, Oct 24
Delta Logo
11:21 am - 10:34 pm-
12h 13m
Delta Logo
6:45 am - 5:37 pm-
9h 52m
$384Delta
Thu, Sep 10 - Thu, Sep 17
Delta Logo
2:25 pm - 11:58 pm-
10h 33m
Delta Logo
6:45 am - 5:37 pm-
9h 52m
$409Delta
Thu, Sep 24 - Tue, Sep 29
United Airlines Logo
1:36 pm - 9:31 pm-
8h 55m
United Airlines Logo
5:40 pm - 11:31 pm-
4h 51m
$428United Airlines
Fri, Sep 11 - Sun, Sep 13
United Airlines Logo
1:36 pm - 5:58 pm-
5h 22m
United Airlines Logo
12:24 pm - 10:00 pm-
8h 36m
$451United Airlines
Fri, Aug 28 - Fri, Sep 4

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Frontier flights from St. Louis to Boise

Our best Frontier deals on St. Louis to Boise flight tickets
Frontier
Sep 7
STL7:58 pmLambert-St Louis
17h 31m
1 stop
BOI12:29 pmBoise Air Term. Gowen Fld
Sep 14
BOI2:50 pmBoise Air Term. Gowen Fld
19h 42m
1 stop
STL11:32 amLambert-St Louis
$285
Frontier
Sep 7
STL7:58 pmLambert-St Louis
17h 31m
1 stop
BOI12:29 pmBoise Air Term. Gowen Fld
Sep 14
BOI2:50 pmBoise Air Term. Gowen Fld
19h 42m
1 stop
STL11:32 amLambert-St Louis
$287
Frontier
Sep 10
STL12:17 pmLambert-St Louis
26h 38m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
Sep 17
BOI2:50 pmBoise Air Term. Gowen Fld
19h 37m
1 stop
STL11:27 amLambert-St Louis
$294

Southwest flights from St. Louis to Boise

Our best Southwest deals on St. Louis to Boise flight tickets
Southwest
Sep 11
STL6:05 pmLambert-St Louis
5h 35m
1 stop
BOI10:40 pmBoise Air Term. Gowen Fld
Sep 24
BOI2:55 pmBoise Air Term. Gowen Fld
7h 20m
1 stop
STL11:15 pmLambert-St Louis
$369
Southwest
Oct 22
STL5:05 amLambert-St Louis
9h 15m
2 stops
BOI1:20 pmBoise Air Term. Gowen Fld
Oct 24
BOI5:30 amBoise Air Term. Gowen Fld
7h 55m
2 stops
STL2:25 pmLambert-St Louis
$406
Southwest
Aug 27
STL6:05 amLambert-St Louis
9h 10m
2 stops
BOI2:15 pmBoise Air Term. Gowen Fld
Sep 3
BOI4:55 pmBoise Air Term. Gowen Fld
6h 00m
1 stop
STL11:55 pmLambert-St Louis
$415

momondo 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, momondo users made 832,500 searches. Data last updated August 4, 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

Price

Cheapest round-trip

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Mon 9/7

7:58 pm-12:29 pm

1 stop17h 31m

Boise Air Term. Gowen Fld

Mon 9/14

2:50 pm-11:32 am

1 stop19h 42m

$285

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Mon 9/7

7:58 pm-12:29 pm

1 stop17h 31m

Boise Air Term. Gowen Fld

Mon 9/14

2:50 pm-11:32 am

1 stop19h 42m

$287
Quickest round-trip

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 9/11

6:05 pm-10:40 pm

1 stop5h 35m

Boise Air Term. Gowen Fld

Thu 9/24

2:55 pm-11:15 pm

1 stop7h 20m

$369

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 9/11

6:00 pm-11:55 pm

1 stop6h 55m

Boise Air Term. Gowen Fld

Sat 9/12

3:25 pm-10:25 pm

1 stop6h 00m

$369

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 8/27

8:00 am-1:24 pm

1 stop6h 24m

Boise Air Term. Gowen Fld

Mon 8/31

1:55 pm-12:14 am

2 stops9h 19m

$374

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 10/22

7:29 am-2:33 pm

1 stop8h 04m

Boise Air Term. Gowen Fld

Sat 10/24

8:00 am-6:20 pm

2 stops9h 20m

$374

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 9/10

11:21 am-10:34 pm

2 stops12h 13m

Boise Air Term. Gowen Fld

Thu 9/17

6:45 am-5:37 pm

2 stops9h 52m

$384

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 9/24

2:25 pm-11:58 pm

2 stops10h 33m

Boise Air Term. Gowen Fld

Tue 9/29

6:45 am-5:37 pm

2 stops9h 52m

$409

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 9/11

1:36 pm-9:31 pm

2 stops8h 55m

Boise Air Term. Gowen Fld

Sun 9/13

5:40 pm-11:31 pm

1 stop4h 51m

$428

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 8/28

1:36 pm-5:58 pm

1 stop5h 22m

Boise Air Term. Gowen Fld

Fri 9/4

12:24 pm-10:00 pm

1 stop8h 36m

$451

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Boise from

How to get the cheapest flight ticket from St. Louis to Boise

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Boise?

Prices are currently low for flights on this route.

Typical prices usually range from $357 to $676.
The lowest price recently found on this route was $285.

What is the cheapest month to fly to Boise?

The month of January is, on average, the cheapest month to fly to Boise from St. Louis, with most prices found around $359. If you aren’t able to travel during the month of January, then book flights to Boise from St. Louis during September instead. Flights to Boise in September, while not as cheap as those in January, still average around $382.

How have St. Louis to Boise flight prices changed over time?

As of August 2026, prices for St. Louis to Boise flights are approximately 28% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Boise

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Boise according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Boise (STL to BOI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Boise

Fastest flight time

5h 07m

Direct flights

None
The fastest flight from St. Louis to Boise takes 5h 07m
There are no direct flights from St. Louis to Boise. There are no popular flight routes from St. Louis to Boise.
Search flight deals

Frequently asked questions about flying from St. Louis to Boise

  • How far is Lambert-St Louis to Boise Air Term. Gowen Fld by plane?

    Lambert-St Louis and Boise Air Term. Gowen Fld are 1389.5 mi apart from one another. By plane, this route typically takes 5h 07m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport?

    Prices for flights from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport.

  • What documentation or ID do you need to fly to Boise Air Term. Gowen Fld Airport?

    The travel and health documents required for your trip to Boise Air Term. Gowen Fld Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Boise Air Term. Gowen Fld Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Boise?

Best airlines flying from St. Louis to Boise

Compare and see reviews for airlines that fly from St. Louis to Boise with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $186Free CancellationRating
7.1
11,845 reviews
Search American Airlines flights
DeltaPriceFrom $240Free CancellationRating
7.8
8,483 reviews
Search Delta flights
SouthwestPriceFrom $321Free CancellationRating
8.0
4,222 reviews
Search Southwest flights
United AirlinesPriceFrom $338Free CancellationRating
7.4
10,059 reviews
Search United Airlines flights

Traveling to a place near Boise?

Book flights to Boise if you plan to visit one of these locations
Nampa
Meridian
Ontario
Caldwell
McCall
Eagle

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Boise?

It is quick and easy to find St. Louis to Boise flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Boise that suits you.

Can I find flights from St. Louis to Boise with flexible booking policies on momondo?

Flights from St. Louis to Boise with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Boise?

momondo provides multiple filters to help you find the best flight to Boise from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from St. Louis to Boise right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Boise flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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