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Cheap flights from Boise to St. Louis from $134

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 7/21. 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 Boise to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$286Frontier
Thu, Jul 16 - Sat, Jul 18
Frontier Logo
1:25 pm - 6:53 pm
BOI
-
STL
28h 28m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$306Frontier
Thu, Jul 2 - Wed, Jul 8
Frontier Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$314Frontier
Tue, Jul 7 - Sat, Jul 11
Frontier Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$318Frontier
Thu, Jul 23 - Mon, Aug 3
Frontier Logo
1:25 pm - 6:53 pm
BOI
-
STL
28h 28m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$339Frontier
Thu, Jul 2 - Wed, Jul 8
Multiple Airlines Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
Multiple Airlines Logo
5:37 pm - 11:48 pm
STL
-
BOI
7h 11m
1 stop
$356Multiple Airlines
Tue, Aug 4 - Fri, Aug 7
Multiple Airlines Logo
4:27 pm - 11:59 pm
BOI
-
STL
6h 32m
1 stop
Multiple Airlines Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$358Multiple Airlines
Wed, Jul 15 - Wed, Jul 22
Frontier Logo
1:25 pm - 6:53 pm
BOI
-
STL
28h 28m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$360Frontier
Thu, Jul 2 - Wed, Jul 8
Alaska Airlines Logo
6:23 am - 2:21 pm
BOI
-
STL
6h 58m
1 stop
Alaska Airlines Logo
6:29 am - 12:35 pm
STL
-
BOI
7h 06m
1 stop
$363Alaska Airlines
Wed, Sep 9 - Tue, Sep 15
American Airlines Logo
3:54 pm - 11:58 pm
BOI
-
STL
7h 04m
1 stop
American Airlines Logo
8:38 am - 4:50 pm
STL
-
BOI
9h 12m
2 stops
$368American Airlines
Wed, Jul 15 - Wed, Jul 22

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Delta flights from Boise to St. Louis

Our best Delta deals on Boise to St. Louis flight tickets
Delta
Jul 21
BOI6:42 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL12:41 amLambert-St Louis
Jul 23
STL7:55 pmLambert-St Louis
5h 10m
1 stop
BOI12:05 amBoise Air Term. Gowen Fld
$415
Delta
Jul 30
BOI6:42 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL12:41 amLambert-St Louis
Aug 3
STL5:34 pmLambert-St Louis
7h 25m
1 stop
BOI11:59 pmBoise Air Term. Gowen Fld
$467
Delta
Jul 10
BOI6:42 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL12:41 amLambert-St Louis
Jul 23
STL7:55 pmLambert-St Louis
5h 10m
1 stop
BOI12:05 amBoise Air Term. Gowen Fld
$487

Frontier flights from Boise to St. Louis

Our best Frontier deals on Boise to St. Louis flight tickets
Frontier
Jul 16
BOI1:24 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL7:23 pmLambert-St Louis
Jul 18
STL8:08 pmLambert-St Louis
17h 21m
1 stop
BOI12:29 pmBoise Air Term. Gowen Fld
$286
Frontier
Jul 2
BOI1:25 pmBoise Air Term. Gowen Fld
28h 28m
1 stop
STL6:53 pmLambert-St Louis
Jul 8
STL8:08 pmLambert-St Louis
17h 21m
1 stop
BOI12:29 pmBoise Air Term. Gowen Fld
$306
Frontier
Jul 7
BOI1:24 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL7:23 pmLambert-St Louis
Jul 11
STL8:08 pmLambert-St Louis
17h 21m
1 stop
BOI12:29 pmBoise Air Term. Gowen Fld
$314

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 June 21, 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

Cheapest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 7/16

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Sat 7/18

8:08 pm-12:29 pm

1 stop17h 21m

$286

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 7/2

1:25 pm-6:53 pm

1 stop28h 28m

Lambert-St Louis

Wed 7/8

8:08 pm-12:29 pm

1 stop17h 21m

$306

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 7/7

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Sat 7/11

8:08 pm-12:29 pm

1 stop17h 21m

$314

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 7/23

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Mon 8/3

8:08 pm-12:29 pm

1 stop17h 21m

$318

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 7/2

1:25 pm-6:53 pm

1 stop28h 28m

Lambert-St Louis

Wed 7/8

8:08 pm-12:29 pm

1 stop17h 21m

$339
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 8/4

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Fri 8/7

5:37 pm-11:48 pm

1 stop7h 11m

$356

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 7/15

4:27 pm-11:59 pm

1 stop6h 32m

Lambert-St Louis

Wed 7/22

8:08 pm-12:29 pm

1 stop17h 21m

$358

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 7/2

1:25 pm-6:53 pm

1 stop28h 28m

Lambert-St Louis

Wed 7/8

8:08 pm-12:29 pm

1 stop17h 21m

$360

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 9/9

6:23 am-2:21 pm

1 stop6h 58m

Lambert-St Louis

Tue 9/15

6:29 am-12:35 pm

1 stop7h 06m

$363

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 7/15

3:54 pm-11:58 pm

1 stop7h 04m

Lambert-St Louis

Wed 7/22

8:38 am-4:50 pm

2 stops9h 12m

$368

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 typical price of a round-trip flight between Boise and St. Louis?

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 February is another great option to travel to St. Louis, with average flight prices from Boise averaging around $376.

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

4h 59m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 59m
There are no direct flights from Boise to St. Louis. There are no popular flight routes from Boise to St. Louis.
Search flight deals

Frequently asked questions about flying from Boise to St. Louis

  • 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 4h 59m.

  • 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 $260Free CancellationRating
7.8
8,423 reviews
Search Delta flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
9,868 reviews
Search United Airlines flights
SouthwestPriceFrom $298Free CancellationRating
7.9
4,242 reviews
Search Southwest flights

  • Southwest Flights From Boise to St. Louis

    Southwest flies from Boise to St. Louis around 3 times per week, with 4,242 momondo users rating the airline 7.9/10. The cheapest Southwest deal from Boise to St. Louis in the last 72 hours was $298 (round-trip), much lower than the average airfare cost of $489 for Southwest flights on this route.

Traveling to a place near St. Louis?

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