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Cheap flights from Boise to St. Louis from $186

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 6/18. 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
1:25 pm - 6:53 pm
BOI
-
STL
28h 28m
1 stop
Frontier Logo
8:08 pm - 12:30 pm
STL
-
BOI
17h 22m
1 stop
$290Frontier
Thu, Jun 11 - Wed, Jun 17
United Airlines Logo
10:36 am - 4:34 pm
BOI
-
STL
4h 58m
1 stop
United Airlines Logo
9:00 am - 1:38 pm
STL
-
BOI
5h 38m
1 stop
$357United Airlines
Sat, Aug 22 - Sat, Aug 29
United Airlines Logo
2:44 pm - 8:38 pm
BOI
-
STL
4h 54m
1 stop
United Airlines Logo
1:36 pm - 9:24 pm
STL
-
BOI
8h 48m
2 stops
$362United Airlines
Sat, Aug 22 - Sat, Aug 29
Alaska Airlines Logo
8:03 am - 6:38 pm
BOI
-
STL
9h 35m
1 stop
Alaska Airlines Logo
6:08 pm - 11:55 pm
STL
-
BOI
6h 47m
1 stop
$380Alaska Airlines
Tue, Sep 29 - Wed, Sep 30
Delta Logo
11:59 am - 7:03 pm
BOI
-
STL
6h 04m
1 stop
Delta Logo
7:55 pm - 12:09 am
STL
-
BOI
5h 14m
1 stop
$403Delta
Wed, Jun 17 - Wed, Jun 24
American Airlines Logo
4:06 pm - 11:59 pm
BOI
-
STL
6h 53m
1 stop
American Airlines Logo
5:13 pm - 11:22 pm
STL
-
BOI
7h 09m
1 stop
$405American Airlines
Tue, Jun 23 - Fri, Jul 3
Southwest Logo
11:45 am - 11:30 pm
BOI
-
STL
10h 45m
2 stops
Southwest Logo
5:35 am - 10:45 am
STL
-
BOI
6h 10m
1 stop
$408Southwest
Wed, Jul 15 - Tue, Jul 21
Southwest Logo
5:30 am - 3:10 pm
BOI
-
STL
8h 40m
2 stops
Southwest Logo
5:20 pm - 12:25 am
STL
-
BOI
8h 05m
2 stops
$413Southwest
Wed, Jul 15 - Tue, Jul 21
Southwest Logo
3:00 pm - 9:50 pm
BOI
-
STL
5h 50m
1 stop
Southwest Logo
7:45 pm - 1:10 am
STL
-
BOI
6h 25m
1 stop
$424Southwest
Wed, Jun 17 - Mon, Jun 22
Southwest Logo
3:00 pm - 11:45 pm
BOI
-
STL
7h 45m
1 stop
Southwest Logo
6:40 pm - 1:45 am
STL
-
BOI
8h 05m
2 stops
$430Southwest
Tue, Jun 23 - Fri, Jul 3

United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Aug 22
BOI10:36 amBoise Air Term. Gowen Fld
4h 58m
1 stop
STL4:34 pmLambert-St Louis
Aug 29
STL9:00 amLambert-St Louis
5h 38m
1 stop
BOI1:38 pmBoise Air Term. Gowen Fld
$357
United Airlines
Aug 22
BOI2:44 pmBoise Air Term. Gowen Fld
4h 54m
1 stop
STL8:38 pmLambert-St Louis
Aug 29
STL1:36 pmLambert-St Louis
8h 48m
2 stops
BOI9:24 pmBoise Air Term. Gowen Fld
$362
United Airlines
Sep 29
BOI10:37 amBoise Air Term. Gowen Fld
9h 44m
2 stops
STL9:21 pmLambert-St Louis
Sep 30
STL7:00 amLambert-St Louis
8h 04m
1 stop
BOI2:04 pmBoise Air Term. Gowen Fld
$477

American Airlines flights from Boise to St. Louis

Our best American Airlines deals on Boise to St. Louis flight tickets
American Airlines
Jun 23
BOI4:06 pmBoise Air Term. Gowen Fld
6h 53m
1 stop
STL11:59 pmLambert-St Louis
Jul 3
STL5:13 pmLambert-St Louis
7h 09m
1 stop
BOI11:22 pmBoise Air Term. Gowen Fld
$405
American Airlines
Aug 1
BOI3:53 pmBoise Air Term. Gowen Fld
7h 05m
1 stop
STL11:58 pmLambert-St Louis
Aug 8
STL5:42 amLambert-St Louis
6h 45m
1 stop
BOI11:27 amBoise Air Term. Gowen Fld
$441
American Airlines
Jun 15
BOI1:59 pmBoise Air Term. Gowen Fld
8h 58m
1 stop
STL11:57 pmLambert-St Louis
Jun 22
STL7:04 amLambert-St Louis
9h 02m
1 stop
BOI3:06 pmBoise Air Term. Gowen Fld
$445

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 May 22, 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 6/11

1:25 pm-6:53 pm

1 stop28h 28m

Lambert-St Louis

Wed 6/17

8:08 pm-12:30 pm

1 stop17h 22m

$290
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 8/22

10:36 am-4:34 pm

1 stop4h 58m

Lambert-St Louis

Sat 8/29

9:00 am-1:38 pm

1 stop5h 38m

$357

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 8/22

2:44 pm-8:38 pm

1 stop4h 54m

Lambert-St Louis

Sat 8/29

1:36 pm-9:24 pm

2 stops8h 48m

$362

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 9/29

8:03 am-6:38 pm

1 stop9h 35m

Lambert-St Louis

Wed 9/30

6:08 pm-11:55 pm

1 stop6h 47m

$380

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 6/17

11:59 am-7:03 pm

1 stop6h 04m

Lambert-St Louis

Wed 6/24

7:55 pm-12:09 am

1 stop5h 14m

$403

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/23

4:06 pm-11:59 pm

1 stop6h 53m

Lambert-St Louis

Fri 7/3

5:13 pm-11:22 pm

1 stop7h 09m

$405

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 7/15

11:45 am-11:30 pm

2 stops10h 45m

Lambert-St Louis

Tue 7/21

5:35 am-10:45 am

1 stop6h 10m

$408

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 7/15

5:30 am-3:10 pm

2 stops8h 40m

Lambert-St Louis

Tue 7/21

5:20 pm-12:25 am

2 stops8h 05m

$413

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 6/17

3:00 pm-9:50 pm

1 stop5h 50m

Lambert-St Louis

Mon 6/22

7:45 pm-1:10 am

1 stop6h 25m

$424

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/23

3:00 pm-11:45 pm

1 stop7h 45m

Lambert-St Louis

Fri 7/3

6:40 pm-1:45 am

2 stops8h 05m

$430

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

5h 05m

Direct flights

None
The fastest flight from Boise to St. Louis takes 5h 05m
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 5h 05m.

  • 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 $143Free CancellationRating
7.9
8,449 reviews
Search Delta flights
SouthwestPriceFrom $278Free CancellationRating
7.9
4,278 reviews
Search Southwest flights
American AirlinesPriceFrom $278Free CancellationRating
7.1
11,644 reviews
Search American Airlines flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
9,751 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
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Alton
Wentzville
Fenton
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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