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Cheap flights from St. Louis to Boise from $103

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 10/29. 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.
Delta Logo
6:00 am - 4:06 pmSTL-BOI
11h 06m2 stops
Delta Logo
11:41 am - 9:23 pmBOI-STL
8h 42m2 stops
$256Delta
Find Deal
Tue, Nov 4 - Sat, Nov 8
Frontier Logo
8:40 pm - 11:48 amSTL-BOI
16h 08m1 stop
Frontier Logo
12:33 pm - 9:07 amBOI-STL
19h 34m1 stop
$278Frontier
Find Deal
Wed, Oct 29 - Sun, Nov 2
Delta Logo
6:00 am - 4:06 pmSTL-BOI
11h 06m2 stops
Delta Logo
7:45 pm - 8:55 amBOI-STL
12h 10m2 stops
$287Delta
Find Deal
Thu, Nov 6 - Mon, Nov 10
United Airlines Logo
5:29 pm - 11:28 pmSTL-BOI
6h 59m1 stop
United Airlines Logo
8:25 am - 4:28 pmBOI-STL
7h 03m1 stop
$292United Airlines
Find Deal
Tue, Nov 11 - Wed, Nov 12
United Airlines Logo
1:35 pm - 11:28 pmSTL-BOI
10h 53m2 stops
United Airlines Logo
6:20 am - 4:28 pmBOI-STL
9h 08m2 stops
$317United Airlines
Find Deal
Tue, Nov 11 - Wed, Nov 12
American Airlines Logo
7:00 am - 12:35 pmSTL-BOI
6h 35m1 stop
American Airlines Logo
1:25 pm - 10:58 pmBOI-STL
8h 33m1 stop
$327American Airlines
Find Deal
Thu, Nov 6 - Mon, Nov 10
Alaska Airlines Logo
7:00 am - 3:12 pmSTL-BOI
9h 12m1 stop
Alaska Airlines Logo
2:20 pm - 11:59 pmBOI-STL
8h 39m1 stop
$342Alaska Airlines
Find Deal
Thu, Nov 6 - Mon, Nov 10
Alaska Airlines Logo
7:00 am - 1:47 pmSTL-BOI
7h 47m1 stop
Alaska Airlines Logo
4:30 pm - 11:55 pmBOI-STL
6h 25m1 stop
$396Alaska Airlines
Find Deal
Wed, Apr 8 - Sat, Apr 11
Southwest Logo
5:00 pm - 1:40 amSTL-BOI
9h 40m2 stops
Southwest Logo
8:45 pm - 10:20 amBOI-STL
12h 35m1 stop
$518Southwest
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Sat, Dec 20 - Sun, Dec 28
Southwest Logo
5:00 am - 11:05 amSTL-BOI
7h 05m1 stop
Southwest Logo
4:25 pm - 12:35 amBOI-STL
7h 10m1 stop
$572Southwest
Find Deal
Fri, Dec 26 - Tue, Dec 30

Frontier flights from St. Louis to Boise

Our best Frontier deals on St. Louis to Boise flight tickets
Frontier
Oct 29
STL8:40 pmLambert-St Louis
16h 08m
1 stop
BOI11:48 amBoise Air Term. Gowen Fld
Nov 2
BOI12:33 pmBoise Air Term. Gowen Fld
19h 34m
1 stop
STL9:07 amLambert-St Louis
$278
Find similar
Frontier
Oct 29
STL8:40 pmLambert-St Louis
16h 08m
1 stop
BOI11:48 amBoise Air Term. Gowen Fld
Nov 2
BOI12:33 pmBoise Air Term. Gowen Fld
20h 07m
2 stops
STL9:40 amLambert-St Louis
$449
Find similar
Frontier
Dec 20
STL7:43 pmLambert-St Louis
17h 21m
1 stop
BOI12:04 pmBoise Air Term. Gowen Fld
Dec 28
BOI12:38 pmBoise Air Term. Gowen Fld
20h 24m
1 stop
STL10:02 amLambert-St Louis
$498
Find similar

Alaska Airlines flights from St. Louis to Boise

Our best Alaska Airlines deals on St. Louis to Boise flight tickets
Alaska Airlines
Nov 6
STL7:00 amLambert-St Louis
9h 12m
1 stop
BOI3:12 pmBoise Air Term. Gowen Fld
Nov 10
BOI2:20 pmBoise Air Term. Gowen Fld
8h 39m
1 stop
STL11:59 pmLambert-St Louis
$342
Find similar
Alaska Airlines
Apr 8
STL7:00 amLambert-St Louis
7h 47m
1 stop
BOI1:47 pmBoise Air Term. Gowen Fld
Apr 11
BOI4:30 pmBoise Air Term. Gowen Fld
6h 25m
1 stop
STL11:55 pmLambert-St Louis
$396
Find similar
Alaska Airlines
Oct 30
STL7:00 amLambert-St Louis
9h 12m
1 stop
BOI3:12 pmBoise Air Term. Gowen Fld
Nov 6
BOI2:20 pmBoise Air Term. Gowen Fld
8h 39m
1 stop
STL11:59 pmLambert-St Louis
$426
Find similar

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 October 16, 2025.
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

Tue 11/4

6:00 am-4:06 pm

2 stops11h 06m

Boise Air Term. Gowen Fld

Sat 11/8

11:41 am-9:23 pm

2 stops8h 42m

$256

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 10/29

8:40 pm-11:48 am

1 stop16h 08m

Boise Air Term. Gowen Fld

Sun 11/2

12:33 pm-9:07 am

1 stop19h 34m

$278

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 11/6

6:00 am-4:06 pm

2 stops11h 06m

Boise Air Term. Gowen Fld

Mon 11/10

7:45 pm-8:55 am

2 stops12h 10m

$287

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 11/11

5:29 pm-11:28 pm

1 stop6h 59m

Boise Air Term. Gowen Fld

Wed 11/12

8:25 am-4:28 pm

1 stop7h 03m

$292

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 11/11

1:35 pm-11:28 pm

2 stops10h 53m

Boise Air Term. Gowen Fld

Wed 11/12

6:20 am-4:28 pm

2 stops9h 08m

$317

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 11/6

7:00 am-12:35 pm

1 stop6h 35m

Boise Air Term. Gowen Fld

Mon 11/10

1:25 pm-10:58 pm

1 stop8h 33m

$327

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 11/6

7:00 am-3:12 pm

1 stop9h 12m

Boise Air Term. Gowen Fld

Mon 11/10

2:20 pm-11:59 pm

1 stop8h 39m

$342

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 4/8

7:00 am-1:47 pm

1 stop7h 47m

Boise Air Term. Gowen Fld

Sat 4/11

4:30 pm-11:55 pm

1 stop6h 25m

$396

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 12/20

5:00 pm-1:40 am

2 stops9h 40m

Boise Air Term. Gowen Fld

Sun 12/28

8:45 pm-10:20 am

1 stop12h 35m

$518

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 12/26

5:00 am-11:05 am

1 stop7h 05m

Boise Air Term. Gowen Fld

Tue 12/30

4:25 pm-12:35 am

1 stop7h 10m

$572

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 April is, on average, the cheapest month to fly to Boise from St. Louis, with most prices found around $316. If you aren’t able to travel during the month of April, then book flights to Boise from St. Louis during November instead. Flights to Boise in November, while not as cheap as those in April, still average around $363.

What is the cheapest day to depart on your flight to Boise?

Our data shows that Wednesday is the least expensive day to fly to Boise. Tickets to fly out on this day can be as low as $371. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $590. These prices are subject to change though, so be sure to set up a Price Alert for flights to Boise.

What is the cheapest time of day to depart on your flight to Boise?

Our data shows that the cheapest St. Louis to Boise flights are usually those with departure times at noon. Our users have found flights to Boise at noon for as low as $435. In the afternoon is when there is more demand to fly to Boise, so prices are often more expensive at around $489 per ticket.

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 $406 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 $262 on momondo.

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

As of October 2025, prices for St. Louis to Boise flights are approximately 1% 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

Direct flights

None
There are no direct flights from St. Louis to Boise. There are no popular flight routes from St. Louis to Boise.
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  • 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 19m.

  • 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
11,043 reviews
Search American Airlines flights
DeltaPriceFrom $286Free CancellationRating
7.9
7,984 reviews
Search Delta flights
SouthwestPriceFrom $292Free CancellationRating
8.0
4,241 reviews
Search Southwest flights
United AirlinesPriceFrom $300Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights

  • Southwest Flights From St. Louis to Boise

    Southwest is one of the most popular airlines flying from St. Louis to Boise, operating 3 flights/week on average for this route. A good Southwest flight deal for St. Louis to Boise starts from $292 round-trip, up to an average price of $439. Our users have rated Southwest at 8.0/10.

Traveling to a place near Boise?

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