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Cheap flights from St. Louis to Boise from $119

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 3/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
10:11 pm - 11:11 am
STL
-
BOI
14h 00m
2 stops
Frontier Logo
12:38 pm - 9:49 am
BOI
-
STL
20h 11m
1 stop
$197Frontier
Thu, Feb 26 - Thu, Mar 5
Frontier Logo
8:12 pm - 11:20 am
STL
-
BOI
16h 08m
1 stop
Frontier Logo
12:15 pm - 9:49 am
BOI
-
STL
20h 34m
1 stop
$220Frontier
Wed, Mar 18 - Sun, Mar 22
Delta Logo
3:05 pm - 9:09 pm
STL
-
BOI
7h 04m
1 stop
Delta Logo
5:30 am - 11:48 am
BOI
-
STL
5h 18m
1 stop
$237Delta
Tue, Mar 31 - Sat, Apr 4
Frontier Logo
8:12 pm - 11:20 am
STL
-
BOI
16h 08m
1 stop
Frontier Logo
12:15 pm - 9:49 am
BOI
-
STL
20h 34m
1 stop
$265Frontier
Sat, Mar 14 - Sun, Mar 22
United Airlines Logo
11:15 am - 9:22 pm
STL
-
BOI
11h 07m
2 stops
United Airlines Logo
2:37 pm - 8:54 pm
BOI
-
STL
5h 17m
1 stop
$285United Airlines
Tue, Mar 31 - Sat, Apr 4
Alaska Airlines Logo
7:00 am - 3:29 pm
STL
-
BOI
9h 29m
1 stop
Alaska Airlines Logo
8:20 am - 11:59 pm
BOI
-
STL
14h 39m
1 stop
$290Alaska Airlines
Tue, Mar 31 - Thu, Apr 2
Multiple Airlines Logo
8:12 pm - 11:20 am
STL
-
BOI
16h 08m
1 stop
Multiple Airlines Logo
5:20 pm - 11:19 am
BOI
-
STL
16h 59m
2 stops
$291Multiple Airlines
Wed, Mar 18 - Thu, Mar 19
Delta Logo
2:22 pm - 10:04 pm
STL
-
BOI
8h 42m
2 stops
Delta Logo
5:30 am - 11:48 am
BOI
-
STL
5h 18m
1 stop
$301Delta
Tue, Mar 17 - Wed, Mar 18
American Airlines Logo
5:12 am - 12:42 pm
STL
-
BOI
8h 30m
1 stop
American Airlines Logo
7:00 am - 3:28 pm
BOI
-
STL
7h 28m
1 stop
$306American Airlines
Tue, Mar 31 - Fri, Apr 3
Delta Logo
6:12 pm - 10:11 pm
STL
-
BOI
4h 59m
1 stop
Delta Logo
5:30 am - 2:24 pm
BOI
-
STL
7h 54m
1 stop
$307Delta
Mon, Mar 16 - Wed, Mar 18

Alaska Airlines flights from St. Louis to Boise

Our best Alaska Airlines deals on St. Louis to Boise flight tickets
Alaska Airlines
Mar 31
STL7:00 amLambert-St Louis
9h 29m
1 stop
BOI3:29 pmBoise Air Term. Gowen Fld
Apr 2
BOI8:20 amBoise Air Term. Gowen Fld
14h 39m
1 stop
STL11:59 pmLambert-St Louis
$290
Alaska Airlines
Apr 17
STL7:00 amLambert-St Louis
9h 29m
1 stop
BOI3:29 pmBoise Air Term. Gowen Fld
Apr 27
BOI6:08 pmBoise Air Term. Gowen Fld
20h 42m
1 stop
STL3:50 pmLambert-St Louis
$343
Alaska Airlines
May 19
STL6:20 pmLambert-St Louis
6h 38m
1 stop
BOI11:58 pmBoise Air Term. Gowen Fld
May 21
BOI9:00 amBoise Air Term. Gowen Fld
7h 06m
1 stop
STL5:06 pmLambert-St Louis
$383

American Airlines flights from St. Louis to Boise

Our best American Airlines deals on St. Louis to Boise flight tickets
American Airlines
Mar 31
STL5:12 amLambert-St Louis
8h 30m
1 stop
BOI12:42 pmBoise Air Term. Gowen Fld
Apr 3
BOI7:00 amBoise Air Term. Gowen Fld
7h 28m
1 stop
STL3:28 pmLambert-St Louis
$306
American Airlines
May 16
STL7:05 amLambert-St Louis
6h 33m
1 stop
BOI12:38 pmBoise Air Term. Gowen Fld
May 26
BOI2:58 pmBoise Air Term. Gowen Fld
7h 44m
1 stop
STL11:42 pmLambert-St Louis
$352
American Airlines
May 1
STL6:00 amLambert-St Louis
7h 38m
1 stop
BOI12:38 pmBoise Air Term. Gowen Fld
May 4
BOI2:14 pmBoise Air Term. Gowen Fld
8h 45m
1 stop
STL11:59 pmLambert-St Louis
$373

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 January 29, 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

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 2/26

10:11 pm-11:11 am

2 stops14h 00m

Boise Air Term. Gowen Fld

Thu 3/5

12:38 pm-9:49 am

1 stop20h 11m

$197

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 3/18

8:12 pm-11:20 am

1 stop16h 08m

Boise Air Term. Gowen Fld

Sun 3/22

12:15 pm-9:49 am

1 stop20h 34m

$220

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 3/31

3:05 pm-9:09 pm

1 stop7h 04m

Boise Air Term. Gowen Fld

Sat 4/4

5:30 am-11:48 am

1 stop5h 18m

$237

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 3/14

8:12 pm-11:20 am

1 stop16h 08m

Boise Air Term. Gowen Fld

Sun 3/22

12:15 pm-9:49 am

1 stop20h 34m

$265

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 3/31

11:15 am-9:22 pm

2 stops11h 07m

Boise Air Term. Gowen Fld

Sat 4/4

2:37 pm-8:54 pm

1 stop5h 17m

$285

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 3/31

7:00 am-3:29 pm

1 stop9h 29m

Boise Air Term. Gowen Fld

Thu 4/2

8:20 am-11:59 pm

1 stop14h 39m

$290

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 3/18

8:12 pm-11:20 am

1 stop16h 08m

Boise Air Term. Gowen Fld

Thu 3/19

5:20 pm-11:19 am

2 stops16h 59m

$291

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 3/17

2:22 pm-10:04 pm

2 stops8h 42m

Boise Air Term. Gowen Fld

Wed 3/18

5:30 am-11:48 am

1 stop5h 18m

$301

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 3/31

5:12 am-12:42 pm

1 stop8h 30m

Boise Air Term. Gowen Fld

Fri 4/3

7:00 am-3:28 pm

1 stop7h 28m

$306

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Mon 3/16

6:12 pm-10:11 pm

1 stop4h 59m

Boise Air Term. Gowen Fld

Wed 3/18

5:30 am-2:24 pm

1 stop7h 54m

$307

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 cheapest month to fly to Boise?

The month of November is, on average, the cheapest month to fly to Boise from St. Louis, with most prices found around $358. If you aren’t able to travel during the month of November, then book flights to Boise from St. Louis during January instead. Flights to Boise in January, while not as cheap as those in November, still average around $359.

How far in advance should I book a flight 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 $426 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 $304 on momondo.

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

As of January 2026, prices for St. Louis to Boise flights are approximately 135% 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 57m

Direct flights

None
The fastest flight from St. Louis to Boise takes 5h 57m
There are no direct flights from St. Louis to Boise. There are no popular flight routes from St. Louis to Boise.
Search flight deals

  • 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 57m.

  • 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
7.2
11,205 reviews
Search American Airlines flights
DeltaPriceFrom $278Free CancellationRating
7.9
8,128 reviews
Search Delta flights
SouthwestPriceFrom $296Free CancellationRating
8.0
4,267 reviews
Search Southwest flights
United AirlinesPriceFrom $338Free CancellationRating
7.4
9,215 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
Caldwell
Ontario
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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