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Cheap flights from Boise to St. Louis from $112

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boise to St. Louis departing on 3/8. 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 Boise to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
11:56 am - 1:09 pm
BOI
-
STL
24h 13m
1 stop
Frontier Logo
8:12 pm - 10:20 am
STL
-
BOI
15h 08m
1 stop
$236Frontier
Sun, Mar 1 - Sat, Mar 7
Frontier Logo
11:56 am - 9:13 pm
BOI
-
STL
32h 17m
2 stops
Frontier Logo
8:12 pm - 10:20 am
STL
-
BOI
15h 08m
1 stop
$279Frontier
Sun, Mar 1 - Sat, Mar 7
United Airlines Logo
12:59 pm - 11:34 pm
BOI
-
STL
9h 35m
2 stops
United Airlines Logo
6:25 am - 12:13 pm
STL
-
BOI
6h 48m
1 stop
$282United Airlines
Tue, Mar 10 - Tue, Mar 17
Delta Logo
11:30 pm - 9:05 am
BOI
-
STL
8h 35m
1 stop
Delta Logo
3:05 pm - 9:09 pm
STL
-
BOI
7h 04m
1 stop
$287Delta
Tue, Mar 10 - Tue, Mar 17
Delta Logo
1:45 pm - 12:21 am
BOI
-
STL
9h 36m
2 stops
Delta Logo
2:22 pm - 10:04 pm
STL
-
BOI
8h 42m
2 stops
$345Delta
Tue, Mar 10 - Tue, Mar 17
Alaska Airlines Logo
2:22 pm - 11:59 pm
BOI
-
STL
8h 37m
1 stop
Alaska Airlines Logo
5:30 pm - 11:56 pm
STL
-
BOI
7h 26m
1 stop
$348Alaska Airlines
Wed, Mar 25 - Sat, Mar 28
Delta Logo
11:30 pm - 9:05 am
BOI
-
STL
8h 35m
1 stop
Delta Logo
5:00 pm - 10:11 pm
STL
-
BOI
6h 11m
1 stop
$354Delta
Wed, Mar 25 - Sat, Mar 28
Multiple Airlines Logo
11:53 am - 7:12 pm
BOI
-
STL
6h 19m
1 stop
Multiple Airlines Logo
6:20 pm - 11:58 pm
STL
-
BOI
6h 38m
1 stop
$361Multiple Airlines
Thu, May 14 - Sun, May 17
Southwest Logo
7:10 am - 3:45 pm
BOI
-
STL
7h 35m
1 stop
Southwest Logo
3:05 pm - 8:45 pm
STL
-
BOI
6h 40m
1 stop
$367Southwest
Tue, Jun 30 - Tue, Jul 14
United Airlines Logo
2:43 pm - 8:42 pm
BOI
-
STL
4h 59m
1 stop
United Airlines Logo
9:23 am - 5:56 pm
STL
-
BOI
9h 33m
2 stops
$372United Airlines
Tue, Jun 30 - Tue, Jul 14

Southwest flights from Boise to St. Louis

Our best Southwest deals on Boise to St. Louis flight tickets
Southwest
Jun 30
BOI7:10 amBoise Air Term. Gowen Fld
7h 35m
1 stop
STL3:45 pmLambert-St Louis
Jul 14
STL3:05 pmLambert-St Louis
6h 40m
1 stop
BOI8:45 pmBoise Air Term. Gowen Fld
$367
Southwest
Jun 30
BOI6:00 amBoise Air Term. Gowen Fld
8h 10m
2 stops
STL3:10 pmLambert-St Louis
Jul 14
STL8:25 amLambert-St Louis
8h 00m
2 stops
BOI3:25 pmBoise Air Term. Gowen Fld
$377
Southwest
May 15
BOI4:20 pmBoise Air Term. Gowen Fld
6h 30m
1 stop
STL11:50 pmLambert-St Louis
May 18
STL7:20 pmLambert-St Louis
6h 25m
1 stop
BOI12:45 amBoise Air Term. Gowen Fld
$394

United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Mar 10
BOI12:59 pmBoise Air Term. Gowen Fld
9h 35m
2 stops
STL11:34 pmLambert-St Louis
Mar 17
STL6:25 amLambert-St Louis
6h 48m
1 stop
BOI12:13 pmBoise Air Term. Gowen Fld
$282
United Airlines
Jun 30
BOI2:43 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL8:42 pmLambert-St Louis
Jul 14
STL9:23 amLambert-St Louis
9h 33m
2 stops
BOI5:56 pmBoise Air Term. Gowen Fld
$372
United Airlines
Mar 25
BOI12:05 pmBoise Air Term. Gowen Fld
8h 02m
1 stop
STL9:07 pmLambert-St Louis
Mar 28
STL5:15 amLambert-St Louis
5h 51m
1 stop
BOI10:06 amBoise Air Term. Gowen Fld
$388

momondo Fare Finder

 
Customize your flight search to find flights from Boise to St. Louis 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 February 13, 2026.
Use the filters below to find and compare flights from Boise to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 3/1

11:56 am-1:09 pm

1 stop24h 13m

Lambert-St Louis

Sat 3/7

8:12 pm-10:20 am

1 stop15h 08m

$236

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 3/1

11:56 am-9:13 pm

2 stops32h 17m

Lambert-St Louis

Sat 3/7

8:12 pm-10:20 am

1 stop15h 08m

$279

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 3/10

12:59 pm-11:34 pm

2 stops9h 35m

Lambert-St Louis

Tue 3/17

6:25 am-12:13 pm

1 stop6h 48m

$282

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 3/10

11:30 pm-9:05 am

1 stop8h 35m

Lambert-St Louis

Tue 3/17

3:05 pm-9:09 pm

1 stop7h 04m

$287

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 3/10

1:45 pm-12:21 am

2 stops9h 36m

Lambert-St Louis

Tue 3/17

2:22 pm-10:04 pm

2 stops8h 42m

$345

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 3/25

2:22 pm-11:59 pm

1 stop8h 37m

Lambert-St Louis

Sat 3/28

5:30 pm-11:56 pm

1 stop7h 26m

$348

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 3/25

11:30 pm-9:05 am

1 stop8h 35m

Lambert-St Louis

Sat 3/28

5:00 pm-10:11 pm

1 stop6h 11m

$354

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 5/14

11:53 am-7:12 pm

1 stop6h 19m

Lambert-St Louis

Sun 5/17

6:20 pm-11:58 pm

1 stop6h 38m

$361

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/30

7:10 am-3:45 pm

1 stop7h 35m

Lambert-St Louis

Tue 7/14

3:05 pm-8:45 pm

1 stop6h 40m

$367

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/30

2:43 pm-8:42 pm

1 stop4h 59m

Lambert-St Louis

Tue 7/14

9:23 am-5:56 pm

2 stops9h 33m

$372

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 St. Louis from

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

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 St. Louis?

In general, April is the cheapest month to fly from Boise to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $292. The month of September is another great option to travel to St. Louis, with average flight prices from Boise averaging around $294.

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

When to book flights from Boise to St. Louis

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

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

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

Fastest flight time

5h 13m

Direct flights

None
The fastest flight from Boise to St. Louis takes 5h 13m
There are no direct flights from Boise to St. Louis. There are no popular flight routes from Boise to St. Louis.
Search flight deals

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

    The distance between Boise Air Term. Gowen Fld and Lambert-St Louis is about 1389.5 mi. By plane, this route typically takes 5h 13m.

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

    Prices for flights from Boise Air Term. Gowen Fld Airport to Lambert-St Louis Airport are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boise Air Term. Gowen Fld Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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

Best airlines flying from Boise to St. Louis

Compare and see reviews for airlines that fly from Boise to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $143Free CancellationRating
7.9
8,191 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,277 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,878 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $286Free CancellationRating
8.0
4,283 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,286 reviews
Search United Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
Shrewsbury

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Boise.

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

momondo does allow users to show only those flights to St. Louis from Boise which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Boise.

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

If you are not ready to book a flight from Boise to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.

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