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Cheap flights from St. Louis to Boise from $136

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 8/3. 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
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
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
Frontier Logo
1:04 pm - 7:23 pm
BOI
-
STL
5h 19m
1 stop
$274Frontier
Sat, Aug 8 - Sun, Aug 23
Multiple Airlines Logo
3:00 pm - 10:33 pm
STL
-
BOI
8h 33m
1 stop
Multiple Airlines Logo
1:04 pm - 7:23 pm
BOI
-
STL
5h 19m
1 stop
$328Multiple Airlines
Thu, Aug 27 - Tue, Sep 1
Southwest Logo
6:35 am - 10:55 am
STL
-
BOI
5h 20m
1 stop
Southwest Logo
3:00 pm - 9:50 pm
BOI
-
STL
5h 50m
1 stop
$357Southwest
Tue, Jun 2 - Tue, Jun 9
Southwest Logo
6:35 am - 10:55 am
STL
-
BOI
5h 20m
1 stop
Southwest Logo
10:40 am - 8:30 pm
BOI
-
STL
8h 50m
2 stops
$362Southwest
Tue, Jun 2 - Tue, Jun 9
Southwest Logo
5:40 pm - 12:25 am
STL
-
BOI
7h 45m
2 stops
Southwest Logo
3:00 pm - 11:40 pm
BOI
-
STL
7h 40m
2 stops
$367Southwest
Tue, Jun 2 - Tue, Jun 9
American Airlines Logo
5:25 am - 11:19 am
STL
-
BOI
6h 54m
1 stop
American Airlines Logo
3:12 pm - 12:16 am
BOI
-
STL
8h 04m
1 stop
$380American Airlines
Wed, Jun 3 - Wed, Jun 10
Southwest Logo
2:30 pm - 12:25 am
STL
-
BOI
10h 55m
1 stop
Southwest Logo
5:30 am - 3:10 pm
BOI
-
STL
8h 40m
2 stops
$391Southwest
Wed, Jun 3 - Wed, Jun 10
Delta Logo
7:55 pm - 12:09 am
STL
-
BOI
5h 14m
1 stop
Delta Logo
6:42 pm - 12:41 am
BOI
-
STL
4h 59m
1 stop
$395Delta
Tue, Jun 30 - Tue, Jul 7
American Airlines Logo
5:29 am - 10:28 am
STL
-
BOI
5h 59m
1 stop
American Airlines Logo
1:57 pm - 11:59 pm
BOI
-
STL
9h 02m
1 stop
$403American Airlines
Tue, Jun 30 - Tue, Jul 7
American Airlines Logo
5:42 am - 11:27 am
STL
-
BOI
6h 45m
1 stop
American Airlines Logo
2:46 pm - 11:59 pm
BOI
-
STL
8h 13m
1 stop
$404American Airlines
Tue, Aug 11 - Sat, Aug 15

Frontier flights from St. Louis to Boise

Our best Frontier deals on St. Louis to Boise flight tickets
Frontier
Aug 8
STL8:08 pmLambert-St Louis
17h 21m
1 stop
BOI12:29 pmBoise Air Term. Gowen Fld
Aug 23
BOI1:04 pmBoise Air Term. Gowen Fld
5h 19m
1 stop
STL7:23 pmLambert-St Louis
$274
Frontier
Jun 15
STL7:38 pmLambert-St Louis
17h 52m
1 stop
BOI12:30 pmBoise Air Term. Gowen Fld
Jun 21
BOI1:25 pmBoise Air Term. Gowen Fld
28h 28m
1 stop
STL6:53 pmLambert-St Louis
$447
Frontier
Jun 13
STL7:38 pmLambert-St Louis
17h 52m
1 stop
BOI12:30 pmBoise Air Term. Gowen Fld
Jun 21
BOI1:25 pmBoise Air Term. Gowen Fld
27h 53m
2 stops
STL6:18 pmLambert-St Louis
$481

Southwest flights from St. Louis to Boise

Our best Southwest deals on St. Louis to Boise flight tickets
Southwest
Jun 2
STL6:35 amLambert-St Louis
5h 20m
1 stop
BOI10:55 amBoise Air Term. Gowen Fld
Jun 9
BOI3:00 pmBoise Air Term. Gowen Fld
5h 50m
1 stop
STL9:50 pmLambert-St Louis
$357
Southwest
Jun 2
STL6:35 amLambert-St Louis
5h 20m
1 stop
BOI10:55 amBoise Air Term. Gowen Fld
Jun 9
BOI10:40 amBoise Air Term. Gowen Fld
8h 50m
2 stops
STL8:30 pmLambert-St Louis
$362
Southwest
Jun 2
STL5:40 pmLambert-St Louis
7h 45m
2 stops
BOI12:25 amBoise Air Term. Gowen Fld
Jun 9
BOI3:00 pmBoise Air Term. Gowen Fld
7h 40m
2 stops
STL11:40 pmLambert-St Louis
$367

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 May 8, 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

Sat 8/8

8:08 pm-12:29 pm

1 stop17h 21m

Boise Air Term. Gowen Fld

Sun 8/23

1:04 pm-7:23 pm

1 stop5h 19m

$274

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 8/27

3:00 pm-10:33 pm

1 stop8h 33m

Boise Air Term. Gowen Fld

Tue 9/1

1:04 pm-7:23 pm

1 stop5h 19m

$328

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 6/2

6:35 am-10:55 am

1 stop5h 20m

Boise Air Term. Gowen Fld

Tue 6/9

3:00 pm-9:50 pm

1 stop5h 50m

$357

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 6/2

6:35 am-10:55 am

1 stop5h 20m

Boise Air Term. Gowen Fld

Tue 6/9

10:40 am-8:30 pm

2 stops8h 50m

$362

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 6/2

5:40 pm-12:25 am

2 stops7h 45m

Boise Air Term. Gowen Fld

Tue 6/9

3:00 pm-11:40 pm

2 stops7h 40m

$367

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 6/3

5:25 am-11:19 am

1 stop6h 54m

Boise Air Term. Gowen Fld

Wed 6/10

3:12 pm-12:16 am

1 stop8h 04m

$380

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 6/3

2:30 pm-12:25 am

1 stop10h 55m

Boise Air Term. Gowen Fld

Wed 6/10

5:30 am-3:10 pm

2 stops8h 40m

$391
Quickest round-trip

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 6/30

7:55 pm-12:09 am

1 stop5h 14m

Boise Air Term. Gowen Fld

Tue 7/7

6:42 pm-12:41 am

1 stop4h 59m

$395

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 6/30

5:29 am-10:28 am

1 stop5h 59m

Boise Air Term. Gowen Fld

Tue 7/7

1:57 pm-11:59 pm

1 stop9h 02m

$403

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 8/11

5:42 am-11:27 am

1 stop6h 45m

Boise Air Term. Gowen Fld

Sat 8/15

2:46 pm-11:59 pm

1 stop8h 13m

$404

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?

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 November instead. Flights to Boise in November, while not as cheap as those in January, still average around $373.

How far in advance should I book a flight from St. Louis to Boise?

You are more likely to see cheaper flights to Boise from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Boise for around $436 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boise from St. Louis for as low as $284 on momondo.

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

As of May 2026, prices for St. Louis to Boise flights are approximately 249% more expensive 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 05m

Direct flights

None
The fastest flight from St. Louis to Boise takes 5h 05m
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 05m.

  • 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
11,666 reviews
Search American Airlines flights
DeltaPriceFrom $237Free CancellationRating
7.9
8,456 reviews
Search Delta flights
SouthwestPriceFrom $296Free CancellationRating
7.9
4,302 reviews
Search Southwest flights
United AirlinesPriceFrom $334Free CancellationRating
7.4
9,694 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
McCall
Ontario
Caldwell
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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