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Cheap flights from Boise to St. Louis from $179

This is the cheapest round-trip 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
12:07 pm - 9:49 am
BOI
-
STL
20h 42m1 stop
Frontier Logo
8:12 pm - 11:12 am
STL
-
BOI
16h 00m1 stop
$179Frontier
Sun, Mar 8 - Wed, Mar 11
United Airlines Logo
6:40 am - 1:41 pm
BOI
-
STL
6h 01m1 stop
United Airlines Logo
2:45 pm - 9:52 pm
STL
-
BOI
8h 07m1 stop
$223United Airlines
Wed, Feb 4 - Wed, Feb 11
Frontier Logo
12:07 pm - 9:49 am
BOI
-
STL
20h 42m1 stop
Frontier Logo
12:14 pm - 11:12 am
STL
-
BOI
23h 58m2 stops
$224Frontier
Sun, Mar 8 - Wed, Mar 11
United Airlines Logo
2:37 pm - 8:58 pm
BOI
-
STL
5h 21m1 stop
United Airlines Logo
2:45 pm - 11:48 pm
STL
-
BOI
10h 03m2 stops
$246United Airlines
Wed, Feb 4 - Wed, Feb 11
Delta Logo
10:39 am - 9:38 pm
BOI
-
STL
9h 59m2 stops
Delta Logo
6:10 am - 6:28 pm
STL
-
BOI
13h 18m2 stops
$256Delta
Wed, Feb 4 - Wed, Feb 11
American Airlines Logo
1:30 pm - 9:12 pm
BOI
-
STL
6h 42m1 stop
American Airlines Logo
5:12 am - 12:48 pm
STL
-
BOI
8h 36m1 stop
$260American Airlines
Sat, Feb 28 - Wed, Mar 4
United Airlines Logo
2:40 pm - 8:26 pm
BOI
-
STL
4h 46m1 stop
United Airlines Logo
4:30 pm - 11:23 pm
STL
-
BOI
7h 53m1 stop
$264United Airlines
Thu, Feb 19 - Tue, Feb 24
United Airlines Logo
2:40 pm - 8:26 pm
BOI
-
STL
4h 46m1 stop
United Airlines Logo
6:25 am - 1:38 pm
STL
-
BOI
8h 13m2 stops
$270United Airlines
Thu, Feb 19 - Tue, Feb 24
Delta Logo
5:20 am - 2:38 pm
BOI
-
STL
8h 18m1 stop
Delta Logo
6:00 am - 12:28 pm
STL
-
BOI
7h 28m1 stop
$271Delta
Mon, Feb 9 - Thu, Feb 19
Alaska Airlines Logo
6:23 am - 1:54 pm
BOI
-
STL
6h 31m1 stop
Alaska Airlines Logo
2:50 pm - 11:01 pm
STL
-
BOI
9h 11m1 stop
$280Alaska Airlines
Mon, Jan 26 - Fri, Jan 30

American Airlines flights from Boise to St. Louis

Our best American Airlines deals on Boise to St. Louis flight tickets
American Airlines
Feb 28
BOI1:30 pmBoise Air Term. Gowen Fld
6h 42m
1 stop
STL9:12 pmLambert-St Louis
Mar 4
STL5:12 amLambert-St Louis
8h 36m
1 stop
BOI12:48 pmBoise Air Term. Gowen Fld
$260
Find similar
American Airlines
Jan 10
BOI12:37 pmBoise Air Term. Gowen Fld
10h 22m
1 stop
STL11:59 pmLambert-St Louis
Jan 12
STL7:15 amLambert-St Louis
6h 53m
1 stop
BOI1:08 pmBoise Air Term. Gowen Fld
$1,023
Find similar

Alaska Airlines flights from Boise to St. Louis

Our best Alaska Airlines deals on Boise to St. Louis flight tickets
Alaska Airlines
Jan 26
BOI6:23 amBoise Air Term. Gowen Fld
6h 31m
1 stop
STL1:54 pmLambert-St Louis
Jan 30
STL2:50 pmLambert-St Louis
9h 11m
1 stop
BOI11:01 pmBoise Air Term. Gowen Fld
$280
Find similar
Alaska Airlines
Feb 6
BOI1:55 pmBoise Air Term. Gowen Fld
7h 51m
1 stop
STL10:46 pmLambert-St Louis
Feb 7
STL6:19 pmLambert-St Louis
29h 42m
1 stop
BOI11:01 pmBoise Air Term. Gowen Fld
$282
Find similar
Alaska Airlines
Feb 6
BOI6:23 amBoise Air Term. Gowen Fld
6h 31m
1 stop
STL1:54 pmLambert-St Louis
Feb 7
STL6:19 pmLambert-St Louis
14h 53m
2 stops
BOI8:12 amBoise Air Term. Gowen Fld
$286
Find similar

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 January 7, 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 3/8

12:07 pm-9:49 am

1 stop20h 42m

Lambert-St Louis

Wed 3/11

8:12 pm-11:12 am

1 stop16h 00m

$179

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/4

6:40 am-1:41 pm

1 stop6h 01m

Lambert-St Louis

Wed 2/11

2:45 pm-9:52 pm

1 stop8h 07m

$223

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 3/8

12:07 pm-9:49 am

1 stop20h 42m

Lambert-St Louis

Wed 3/11

12:14 pm-11:12 am

2 stops23h 58m

$224

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/4

2:37 pm-8:58 pm

1 stop5h 21m

Lambert-St Louis

Wed 2/11

2:45 pm-11:48 pm

2 stops10h 03m

$246

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/4

10:39 am-9:38 pm

2 stops9h 59m

Lambert-St Louis

Wed 2/11

6:10 am-6:28 pm

2 stops13h 18m

$256

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 2/28

1:30 pm-9:12 pm

1 stop6h 42m

Lambert-St Louis

Wed 3/4

5:12 am-12:48 pm

1 stop8h 36m

$260

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 2/19

2:40 pm-8:26 pm

1 stop4h 46m

Lambert-St Louis

Tue 2/24

4:30 pm-11:23 pm

1 stop7h 53m

$264

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 2/19

2:40 pm-8:26 pm

1 stop4h 46m

Lambert-St Louis

Tue 2/24

6:25 am-1:38 pm

2 stops8h 13m

$270

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 2/9

5:20 am-2:38 pm

1 stop8h 18m

Lambert-St Louis

Thu 2/19

6:00 am-12:28 pm

1 stop7h 28m

$271

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 1/26

6:23 am-1:54 pm

1 stop6h 31m

Lambert-St Louis

Fri 1/30

2:50 pm-11:01 pm

1 stop9h 11m

$280

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, September 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 $301. The month of April is another great option to travel to St. Louis, with average flight prices from Boise averaging around $310.

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

As of January 2026, prices for Boise to St. Louis flights are approximately 83% more expensive when compared to flights at the same time last year.

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 21m

Direct flights

None
The fastest flight from Boise to St. Louis takes 5h 21m
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 21m.

  • 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 $179Free CancellationRating
7.9
8,025 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,095 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,661 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,250 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,139 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
O'Fallon
Maryland Heights
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Festus
Edwardsville
Glencoe
Litchfield
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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