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Cheap flights from Boise to St. Louis from $146

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 9/6. 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
12:24 pm - 7:13 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
5h 49m1 stop Denver Intl
Frontier Logo
12:17 pm - 1:55 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
26h 38m1 stop Las Vegas Harry Reid Intl
$281Frontier
Thu, Sep 3 - Wed, Sep 9
Frontier Logo
12:24 pm - 7:13 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
5h 49m1 stop Denver Intl
Frontier Logo
12:17 pm - 1:55 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
26h 38m1 stop Las Vegas Harry Reid Intl
$291Frontier
Thu, Sep 3 - Wed, Sep 9
Frontier Logo
2:50 pm - 11:17 amBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
19h 27m1 stop Las Vegas Harry Reid Intl
Frontier Logo
12:27 pm - 1:55 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
26h 28m1 stop Las Vegas Harry Reid Intl
$311Frontier
Thu, Sep 10 - Sun, Sep 13
United Airlines Logo
12:24 pm - 10:00 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
8h 36m1 stop Chicago O'Hare Intl
United Airlines Logo
4:40 pm - 9:45 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
6h 05m1 stop Denver Intl
$371United Airlines
Sat, Sep 5 - Wed, Sep 9
United Airlines Logo
2:44 pm - 8:46 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
5h 02m1 stop Denver Intl
United Airlines Logo
9:43 am - 5:58 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
9h 15m2 stops Chicago O'Hare Intl Denver Intl
$376United Airlines
Sat, Sep 5 - Wed, Sep 9
Delta Logo
6:45 am - 5:44 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
9h 59m2 stops Seattle/Tacoma Intl Salt Lake City
Delta Logo
6:20 am - 5:15 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
11h 55m2 stops Minneapolis St Paul Seattle/Tacoma Intl
$419Delta
Sun, Nov 8 - Wed, Nov 18
Southwest Logo
6:00 am - 3:05 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
8h 05m1 stop Las Vegas Harry Reid Intl
Southwest Logo
5:20 pm - 11:15 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
6h 55m1 stop Denver Intl
$420Southwest
Tue, Sep 1 - Tue, Sep 8
Southwest Logo
12:35 pm - 9:40 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
8h 05m2 stops Denver Intl Chicago Midway
Southwest Logo
5:20 pm - 11:15 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
6h 55m1 stop Denver Intl
$425Southwest
Tue, Sep 1 - Tue, Sep 8
Delta Logo
6:00 am - 4:34 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
9h 34m2 stops Seattle/Tacoma Intl Minneapolis St Paul
Delta Logo
2:20 pm - 10:26 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
9h 06m2 stops Salt Lake City Seattle/Tacoma Intl
$433Delta
Fri, Dec 4 - Mon, Dec 7
United Airlines Logo
6:30 am - 12:38 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
5h 08m1 stop Denver Intl
United Airlines Logo
8:50 am - 1:45 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
5h 55m1 stop Denver Intl
$447United Airlines
Sun, Nov 8 - Wed, Nov 18

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Frontier flights from Boise to St. Louis

Our best Frontier deals on Boise to St. Louis flight tickets
Frontier
Sep 3
BOI12:24 pmBoise Air Term. Gowen Fld
5h 49m
1 stop
STL7:13 pmLambert-St Louis
Sep 9
STL12:17 pmLambert-St Louis
26h 38m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$281
Frontier
Sep 3
BOI12:24 pmBoise Air Term. Gowen Fld
5h 49m
1 stop
STL7:13 pmLambert-St Louis
Sep 9
STL12:17 pmLambert-St Louis
26h 38m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$291
Frontier
Sep 10
BOI2:50 pmBoise Air Term. Gowen Fld
19h 27m
1 stop
STL11:17 amLambert-St Louis
Sep 13
STL12:27 pmLambert-St Louis
26h 28m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$311

American Airlines flights from Boise to St. Louis

Our best American Airlines deals on Boise to St. Louis flight tickets
American Airlines
Sep 3
BOI1:55 pmBoise Air Term. Gowen Fld
8h 47m
2 stops
STL11:42 pmLambert-St Louis
Sep 6
STL9:32 amLambert-St Louis
5h 57m
1 stop
BOI2:29 pmBoise Air Term. Gowen Fld
$407
American Airlines
Oct 2
BOI1:52 pmBoise Air Term. Gowen Fld
8h 51m
2 stops
STL11:43 pmLambert-St Louis
Oct 4
STL7:27 amLambert-St Louis
8h 04m
1 stop
BOI2:31 pmBoise Air Term. Gowen Fld
$417
American Airlines
Sep 10
BOI1:52 pmBoise Air Term. Gowen Fld
8h 51m
2 stops
STL11:43 pmLambert-St Louis
Sep 13
STL7:27 amLambert-St Louis
8h 04m
1 stop
BOI2:31 pmBoise Air Term. Gowen Fld
$430

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 August 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

Cheapest round-trip

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Thu 9/3

12:24 pm-7:13 pm

1 stop5h 49m

Lambert-St Louis

Wed 9/9

12:17 pm-1:55 pm

1 stop26h 38m

$281

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Thu 9/3

12:24 pm-7:13 pm

1 stop5h 49m

Lambert-St Louis

Wed 9/9

12:17 pm-1:55 pm

1 stop26h 38m

$291

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Thu 9/10

2:50 pm-11:17 am

1 stop19h 27m

Lambert-St Louis

Sun 9/13

12:27 pm-1:55 pm

1 stop26h 28m

$311

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Sat 9/5

12:24 pm-10:00 pm

1 stop8h 36m

Lambert-St Louis

Wed 9/9

4:40 pm-9:45 pm

1 stop6h 05m

$371

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Sat 9/5

2:44 pm-8:46 pm

1 stop5h 02m

Lambert-St Louis

Wed 9/9

9:43 am-5:58 pm

2 stops9h 15m

$376

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Sun 11/8

6:45 am-5:44 pm

2 stops9h 59m

Lambert-St Louis

Wed 11/18

6:20 am-5:15 pm

2 stops11h 55m

$419

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Tue 9/1

6:00 am-3:05 pm

1 stop8h 05m

Lambert-St Louis

Tue 9/8

5:20 pm-11:15 pm

1 stop6h 55m

$420

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Tue 9/1

12:35 pm-9:40 pm

2 stops8h 05m

Lambert-St Louis

Tue 9/8

5:20 pm-11:15 pm

1 stop6h 55m

$425

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Fri 12/4

6:00 am-4:34 pm

2 stops9h 34m

Lambert-St Louis

Mon 12/7

2:20 pm-10:26 pm

2 stops9h 06m

$433
Quickest round-trip

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Sun 11/8

6:30 am-12:38 pm

1 stop5h 08m

Lambert-St Louis

Wed 11/18

8:50 am-1:45 pm

1 stop5h 55m

$447

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?

Prices are currently low for flights on this route.

Typical prices usually range from $387 to $556.
The lowest price recently found on this route was $281.

What is the cheapest month to fly to St. Louis?

In general, February 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 $0. The month of October is another great option to travel to St. Louis, with average flight prices from Boise averaging around $401.

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 52m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 52m
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 52m.

  • 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
8,502 reviews
Search Delta flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
10,084 reviews
Search United Airlines flights
SouthwestPriceFrom $347Free CancellationRating
8.0
4,217 reviews
Search Southwest 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
Fairview Heights
Hermann
St. Peters
Maryland Heights
Florissant
Collinsville
Alton
O'Fallon
Clayton
Farmington
Fenton
Wentzville
Festus
Eureka
Edwardsville
Litchfield
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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