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Cheap flights from Boise to St. Louis from $149

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 10/22. 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

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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
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
$313Frontier
Thu, Jul 30 - Sat, Aug 8
Multiple Airlines Logo
12:23 pm - 7:15 pm
BOI
-
STL
5h 52m
1 stop
Multiple Airlines Logo
7:00 am - 3:23 pm
STL
-
BOI
9h 23m
1 stop
$337Multiple Airlines
Tue, Oct 20 - Tue, Oct 27
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
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
$351Multiple Airlines
Wed, Jul 1 - Wed, Jul 8
Delta Logo
8:25 am - 5:37 pm
BOI
-
STL
8h 12m
1 stop
Delta Logo
6:25 am - 1:38 pm
STL
-
BOI
8h 13m
1 stop
$364Delta
Wed, Sep 30 - Sun, Oct 4
Multiple Airlines Logo
6:23 am - 1:52 pm
BOI
-
STL
6h 29m
1 stop
Multiple Airlines Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$365Multiple Airlines
Sat, Jul 4 - Sat, Jul 11
Alaska Airlines Logo
8:03 am - 8:52 pm
BOI
-
STL
11h 49m
2 stops
Alaska Airlines Logo
2:27 pm - 10:45 pm
STL
-
BOI
9h 18m
1 stop
$366Alaska Airlines
Tue, Sep 29 - Wed, Sep 30
Alaska Airlines Logo
6:23 am - 8:52 pm
BOI
-
STL
13h 29m
2 stops
Alaska Airlines Logo
8:30 am - 8:20 pm
STL
-
BOI
12h 50m
2 stops
$372Alaska Airlines
Tue, Sep 29 - Wed, Sep 30
Multiple Airlines Logo
12:23 pm - 7:15 pm
BOI
-
STL
5h 52m
1 stop
Multiple Airlines Logo
7:00 am - 8:29 pm
STL
-
BOI
14h 29m
2 stops
$382Multiple Airlines
Tue, Oct 20 - Tue, Oct 27
Multiple Airlines Logo
1:24 pm - 7:23 pm
BOI
-
STL
4h 59m
1 stop
Multiple Airlines Logo
6:02 am - 2:07 pm
STL
-
BOI
9h 05m
1 stop
$388Multiple Airlines
Thu, Jul 30 - Sun, Aug 9

Delta flights from Boise to St. Louis

Our best Delta deals on Boise to St. Louis flight tickets
Delta
Sep 30
BOI8:25 amBoise Air Term. Gowen Fld
8h 12m
1 stop
STL5:37 pmLambert-St Louis
Oct 4
STL6:25 amLambert-St Louis
8h 13m
1 stop
BOI1:38 pmBoise Air Term. Gowen Fld
$364
Delta
Jul 20
BOI6:42 pmBoise Air Term. Gowen Fld
4h 59m
1 stop
STL12:41 amLambert-St Louis
Jul 24
STL7:55 pmLambert-St Louis
5h 10m
1 stop
BOI12:05 amBoise Air Term. Gowen Fld
$467

Alaska Airlines flights from Boise to St. Louis

Our best Alaska Airlines deals on Boise to St. Louis flight tickets
Alaska Airlines
Sep 29
BOI8:03 amBoise Air Term. Gowen Fld
11h 49m
2 stops
STL8:52 pmLambert-St Louis
Sep 30
STL2:27 pmLambert-St Louis
9h 18m
1 stop
BOI10:45 pmBoise Air Term. Gowen Fld
$366
Alaska Airlines
Sep 29
BOI6:23 amBoise Air Term. Gowen Fld
13h 29m
2 stops
STL8:52 pmLambert-St Louis
Sep 30
STL8:30 amLambert-St Louis
12h 50m
2 stops
BOI8:20 pmBoise Air Term. Gowen Fld
$372
Alaska Airlines
Sep 29
BOI8:03 amBoise Air Term. Gowen Fld
9h 35m
1 stop
STL6:38 pmLambert-St Louis
Sep 30
STL6:08 pmLambert-St Louis
6h 47m
1 stop
BOI11:55 pmBoise Air Term. Gowen Fld
$403

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 6, 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 7/30

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Sat 8/8

8:08 pm-12:29 pm

1 stop17h 21m

$313

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 10/20

12:23 pm-7:15 pm

1 stop5h 52m

Lambert-St Louis

Tue 10/27

7:00 am-3:23 pm

1 stop9h 23m

$337

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

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 7/1

4:27 pm-11:59 pm

1 stop6h 32m

Lambert-St Louis

Wed 7/8

8:08 pm-12:29 pm

1 stop17h 21m

$351

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 9/30

8:25 am-5:37 pm

1 stop8h 12m

Lambert-St Louis

Sun 10/4

6:25 am-1:38 pm

1 stop8h 13m

$364

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 7/4

6:23 am-1:52 pm

1 stop6h 29m

Lambert-St Louis

Sat 7/11

8:08 pm-12:29 pm

1 stop17h 21m

$365

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 9/29

8:03 am-8:52 pm

2 stops11h 49m

Lambert-St Louis

Wed 9/30

2:27 pm-10:45 pm

1 stop9h 18m

$366

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 9/29

6:23 am-8:52 pm

2 stops13h 29m

Lambert-St Louis

Wed 9/30

8:30 am-8:20 pm

2 stops12h 50m

$372

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 10/20

12:23 pm-7:15 pm

1 stop5h 52m

Lambert-St Louis

Tue 10/27

7:00 am-8:29 pm

2 stops14h 29m

$382
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 7/30

1:24 pm-7:23 pm

1 stop4h 59m

Lambert-St Louis

Sun 8/9

6:02 am-2:07 pm

1 stop9h 05m

$388

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 54m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 54m
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 54m.

  • 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
8,395 reviews
Search Delta flights
American AirlinesPriceFrom $278Free CancellationRating
7.1
11,651 reviews
Search American Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,258 reviews
Search Southwest flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
9,777 reviews
Search United Airlines flights

  • Southwest Flights From Boise to St. Louis

    Southwest flies from Boise to St. Louis around 3 times per week, with 4,258 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Boise to St. Louis in the last 72 hours was $281 (round-trip), much lower than the average airfare cost of $486 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
Fenton
Alton
Wentzville
Farmington
Festus
Eureka
Clayton
Litchfield
Edwardsville
Shrewsbury
Grafton

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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