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Cheap flights from St. Louis to Boise from $160

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 8/1. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Boise

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
12:46 pm - 2:57 pm
STL
-
BOI
27h 11m
1 stop
Frontier Logo
3:52 pm - 11:51 am
BOI
-
STL
18h 59m
1 stop
$284Frontier
jue., sep. 10 - lun., sep. 14
Frontier Logo
12:46 pm - 2:57 pm
STL
-
BOI
27h 11m
1 stop
Frontier Logo
12:59 pm - 7:15 pm
BOI
-
STL
5h 16m
1 stop
$301Frontier
jue., sep. 24 - dom., sep. 27
Frontier Logo
12:46 pm - 2:57 pm
STL
-
BOI
27h 11m
1 stop
Frontier Logo
12:59 pm - 7:15 pm
BOI
-
STL
5h 16m
1 stop
$311Frontier
jue., sep. 24 - dom., sep. 27
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
Frontier Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
$328Frontier
lun., jul. 27 - dom., ago. 2
Multiple Airlines Logo
5:37 pm - 11:48 pm
STL
-
BOI
7h 11m
1 stop
Multiple Airlines Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
$337Multiple Airlines
mar., jul. 28 - mar., ago. 4
Multiple Airlines Logo
7:56 pm - 9:37 am
STL
-
BOI
14h 41m
1 stop
Multiple Airlines Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
$349Multiple Airlines
jue., ago. 6 - jue., ago. 13
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
Frontier Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
$356Frontier
lun., jul. 27 - dom., ago. 2
Frontier Logo
12:46 pm - 2:57 pm
STL
-
BOI
27h 11m
1 stop
Frontier Logo
3:52 pm - 11:51 am
BOI
-
STL
18h 59m
1 stop
$359Frontier
jue., sep. 17 - lun., sep. 21
Southwest Logo
6:20 pm - 12:35 am
STL
-
BOI
7h 15m
1 stop
Southwest Logo
4:20 pm - 11:35 pm
BOI
-
STL
6h 15m
1 stop
$363Southwest
mié., jul. 15 - mié., jul. 22
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
Frontier Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
$366Frontier
lun., jul. 27 - dom., ago. 2

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United Airlines flights from St. Louis to Boise

Our best United Airlines deals on St. Louis to Boise flight tickets
United Airlines
Jul 29
STL6:00 amLambert-St Louis
6h 32m
1 stop
BOI11:32 amBoise Air Term. Gowen Fld
Aug 1
BOI5:46 pmBoise Air Term. Gowen Fld
5h 01m
1 stop
STL11:47 pmLambert-St Louis
$415
United Airlines
Aug 25
STL1:36 pmLambert-St Louis
8h 48m
2 stops
BOI9:24 pmBoise Air Term. Gowen Fld
Aug 26
BOI2:44 pmBoise Air Term. Gowen Fld
5h 02m
1 stop
STL8:46 pmLambert-St Louis
$458
United Airlines
Aug 25
STL9:00 amLambert-St Louis
11h 24m
2 stops
BOI7:24 pmBoise Air Term. Gowen Fld
Aug 26
BOI10:31 amBoise Air Term. Gowen Fld
10h 29m
2 stops
STL10:00 pmLambert-St Louis
$464

American Airlines flights from St. Louis to Boise

Our best American Airlines deals on St. Louis to Boise flight tickets
American Airlines
Jul 15
STL5:32 amLambert-St Louis
6h 47m
1 stop
BOI11:19 amBoise Air Term. Gowen Fld
Jul 22
BOI1:57 pmBoise Air Term. Gowen Fld
9h 01m
2 stops
STL11:58 pmLambert-St Louis
$368
American Airlines
Jul 28
STL8:38 amLambert-St Louis
9h 11m
2 stops
BOI4:49 pmBoise Air Term. Gowen Fld
Aug 4
BOI1:57 pmBoise Air Term. Gowen Fld
9h 01m
2 stops
STL11:58 pmLambert-St Louis
$374
American Airlines
Jul 15
STL8:38 amLambert-St Louis
9h 12m
2 stops
BOI4:50 pmBoise Air Term. Gowen Fld
Jul 22
BOI1:57 pmBoise Air Term. Gowen Fld
9h 01m
2 stops
STL11:58 pmLambert-St Louis
$385

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 junio 20, 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

jue. 9/10

12:46 pm-2:57 pm

1 stop27h 11m

Boise Air Term. Gowen Fld

lun. 9/14

3:52 pm-11:51 am

1 stop18h 59m

$284

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 9/24

12:46 pm-2:57 pm

1 stop27h 11m

Boise Air Term. Gowen Fld

dom. 9/27

12:59 pm-7:15 pm

1 stop5h 16m

$301

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 9/24

12:46 pm-2:57 pm

1 stop27h 11m

Boise Air Term. Gowen Fld

dom. 9/27

12:59 pm-7:15 pm

1 stop5h 16m

$311

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 7/27

8:08 pm-12:29 pm

1 stop17h 21m

Boise Air Term. Gowen Fld

dom. 8/2

1:24 pm-7:23 pm

1 stop4h 59m

$328
Quickest round-trip

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mar. 7/28

5:37 pm-11:48 pm

1 stop7h 11m

Boise Air Term. Gowen Fld

mar. 8/4

1:24 pm-7:23 pm

1 stop4h 59m

$337

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 8/6

7:56 pm-9:37 am

1 stop14h 41m

Boise Air Term. Gowen Fld

jue. 8/13

1:24 pm-7:23 pm

1 stop4h 59m

$349

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 7/27

8:08 pm-12:29 pm

1 stop17h 21m

Boise Air Term. Gowen Fld

dom. 8/2

1:24 pm-7:23 pm

1 stop4h 59m

$356

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 9/17

12:46 pm-2:57 pm

1 stop27h 11m

Boise Air Term. Gowen Fld

lun. 9/21

3:52 pm-11:51 am

1 stop18h 59m

$359

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mié. 7/15

6:20 pm-12:35 am

1 stop7h 15m

Boise Air Term. Gowen Fld

mié. 7/22

4:20 pm-11:35 pm

1 stop6h 15m

$363

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 7/27

8:08 pm-12:29 pm

1 stop17h 21m

Boise Air Term. Gowen Fld

dom. 8/2

1:24 pm-7:23 pm

1 stop4h 59m

$366

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 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 June 2026, prices for St. Louis to Boise flights are approximately 171% 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 09m

Direct flights

None
The fastest flight from St. Louis to Boise takes 5h 09m
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 09m.

  • 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
11,715 reviews
Search American Airlines flights
DeltaPriceFrom $240Free CancellationRating
7.8
8,420 reviews
Search Delta flights
SouthwestPriceFrom $296Free CancellationRating
7.9
4,241 reviews
Search Southwest flights
United AirlinesPriceFrom $338Free CancellationRating
7.4
9,865 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
McCall
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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