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Cheap flights from Boise to St. Louis from $122

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
12:46 pm - 2:57 pm
STL
-
BOI
27h 11m
1 stop
$254Frontier
Tue, Aug 11 - Wed, Sep 9
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
$266Frontier
Thu, Aug 13 - Mon, Aug 17
Frontier Logo
3:52 pm - 11:51 am
BOI
-
STL
18h 59m
1 stop
Frontier Logo
12:46 pm - 2:57 pm
STL
-
BOI
27h 11m
1 stop
$269Frontier
Mon, Sep 14 - Wed, Sep 16
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
$284Frontier
Thu, Aug 13 - Mon, Aug 17
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 23 - Sat, Jul 25
Frontier Logo
3:52 pm - 11:51 am
BOI
-
STL
18h 59m
1 stop
Frontier Logo
8:10 pm - 12:04 pm
STL
-
BOI
16h 54m
1 stop
$292Frontier
Fri, Sep 11 - Mon, Sep 14
Multiple Airlines Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
Multiple Airlines Logo
7:56 pm - 9:37 am
STL
-
BOI
14h 41m
1 stop
$315Multiple Airlines
Tue, Aug 11 - Thu, Aug 13
Frontier Logo
3:52 pm - 11:51 am
BOI
-
STL
18h 59m
1 stop
Frontier Logo
12:46 pm - 12:04 pm
STL
-
BOI
24h 18m
2 stops
$326Frontier
Mon, Sep 14 - Wed, Sep 16
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
$344Frontier
Sun, Jul 19 - Sat, Jul 25
Frontier Logo
3:52 pm - 11:51 am
BOI
-
STL
18h 59m
1 stop
Frontier Logo
12:46 pm - 12:04 pm
STL
-
BOI
24h 18m
2 stops
$352Frontier
Fri, Sep 11 - Mon, Sep 14

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Frontier flights from Boise to St. Louis

Our best Frontier deals on Boise to St. Louis flight tickets
Frontier
Aug 11
BOI1:24 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL7:23 pmLambert-St Louis
Sep 9
STL12:46 pmLambert-St Louis
27h 11m
1 stop
BOI2:57 pmBoise Air Term. Gowen Fld
$254
Frontier
Aug 13
BOI1:24 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL7:23 pmLambert-St Louis
Aug 17
STL8:08 pmLambert-St Louis
17h 21m
1 stop
BOI12:29 pmBoise Air Term. Gowen Fld
$266
Frontier
Sep 14
BOI3:52 pmBoise Air Term. Gowen Fld
18h 59m
1 stop
STL11:51 amLambert-St Louis
Sep 16
STL12:46 pmLambert-St Louis
27h 11m
1 stop
BOI2:57 pmBoise Air Term. Gowen Fld
$269

Southwest flights from Boise to St. Louis

Our best Southwest deals on Boise to St. Louis flight tickets
Southwest
Aug 13
BOI6:30 amBoise Air Term. Gowen Fld
10h 10m
2 stops
STL5:40 pmLambert-St Louis
Aug 17
STL8:30 amLambert-St Louis
8h 45m
2 stops
BOI4:15 pmBoise Air Term. Gowen Fld
$423
Southwest
Sep 14
BOI10:50 amBoise Air Term. Gowen Fld
10h 50m
2 stops
STL10:40 pmLambert-St Louis
Sep 16
STL8:40 amLambert-St Louis
12h 05m
2 stops
BOI7:45 pmBoise Air Term. Gowen Fld
$424
Southwest
Aug 11
BOI12:35 pmBoise Air Term. Gowen Fld
8h 35m
2 stops
STL10:10 pmLambert-St Louis
Aug 13
STL3:45 pmLambert-St Louis
7h 50m
2 stops
BOI10:35 pmBoise Air Term. Gowen Fld
$437

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 July 3, 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

Tue 8/11

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Wed 9/9

12:46 pm-2:57 pm

1 stop27h 11m

$254

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 8/13

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Mon 8/17

8:08 pm-12:29 pm

1 stop17h 21m

$266

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 9/14

3:52 pm-11:51 am

1 stop18h 59m

Lambert-St Louis

Wed 9/16

12:46 pm-2:57 pm

1 stop27h 11m

$269

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 8/13

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Mon 8/17

8:08 pm-12:29 pm

1 stop17h 21m

$284

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

Sat 7/25

8:08 pm-12:29 pm

1 stop17h 21m

$286

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 9/11

3:52 pm-11:51 am

1 stop18h 59m

Lambert-St Louis

Mon 9/14

8:10 pm-12:04 pm

1 stop16h 54m

$292
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 8/11

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Thu 8/13

7:56 pm-9:37 am

1 stop14h 41m

$315

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 9/14

3:52 pm-11:51 am

1 stop18h 59m

Lambert-St Louis

Wed 9/16

12:46 pm-12:04 pm

2 stops24h 18m

$326

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 7/19

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Sat 7/25

8:08 pm-12:29 pm

1 stop17h 21m

$344

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 9/11

3:52 pm-11:51 am

1 stop18h 59m

Lambert-St Louis

Mon 9/14

12:46 pm-12:04 pm

2 stops24h 18m

$352

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 56m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 56m
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 56m.

  • 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
8,453 reviews
Search Delta flights
Alaska AirlinesPriceFrom $278Free CancellationRating
7.9
12,607 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $278Free CancellationRating
7.1
11,765 reviews
Search American Airlines flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
9,927 reviews
Search United Airlines flights
SouthwestPriceFrom $298Free CancellationRating
7.9
4,250 reviews
Search Southwest flights

  • Southwest Flights From Boise to St. Louis

    Southwest flies from Boise to St. Louis around 2 times per week, with 4,250 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 $506 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
St. Peters
Collinsville
Alton
Fenton
Farmington
Wentzville
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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