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Cheap flights from Boise to St. Louis from $103

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 5/26. 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

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.
American Airlines Logo
4:05 pm - 11:59 pm
BOI
-
STL
6h 54m
1 stop
American Airlines Logo
8:36 am - 3:07 pm
STL
-
BOI
7h 31m
1 stop
$317American Airlines
Wed, May 27 - Fri, May 29
Delta Logo
11:39 pm - 9:44 am
BOI
-
STL
9h 05m
1 stop
Delta Logo
7:59 pm - 12:04 am
STL
-
BOI
5h 05m
1 stop
$322Delta
Tue, May 19 - Tue, May 26
American Airlines Logo
4:06 pm - 11:59 pm
BOI
-
STL
6h 53m
1 stop
American Airlines Logo
6:00 am - 2:20 pm
STL
-
BOI
9h 20m
1 stop
$335American Airlines
Tue, Jun 9 - Tue, Jun 16
Southwest Logo
5:30 am - 3:10 pm
BOI
-
STL
8h 40m
2 stops
Southwest Logo
5:35 am - 10:45 am
STL
-
BOI
6h 10m
1 stop
$341Southwest
Tue, Jun 9 - Tue, Jun 16
American Airlines Logo
2:14 pm - 12:02 am
BOI
-
STL
8h 48m
1 stop
American Airlines Logo
7:00 am - 2:20 pm
STL
-
BOI
8h 20m
1 stop
$344American Airlines
Tue, May 12 - Thu, May 28
Southwest Logo
5:30 am - 3:10 pm
BOI
-
STL
8h 40m
2 stops
Southwest Logo
5:35 am - 12:30 pm
STL
-
BOI
7h 55m
2 stops
$346Southwest
Tue, Jun 9 - Tue, Jun 16
United Airlines Logo
5:44 pm - 11:50 pm
BOI
-
STL
5h 06m
1 stop
United Airlines Logo
5:10 am - 9:35 am
STL
-
BOI
5h 25m
1 stop
$353United Airlines
Tue, Sep 1 - Wed, Sep 2
American Airlines Logo
3:11 pm - 11:56 pm
BOI
-
STL
7h 45m
1 stop
American Airlines Logo
6:00 am - 2:20 pm
STL
-
BOI
9h 20m
1 stop
$354American Airlines
Wed, Jun 10 - Sat, Jun 13
United Airlines Logo
2:44 pm - 12:30 am
BOI
-
STL
8h 46m
2 stops
United Airlines Logo
5:10 am - 9:35 am
STL
-
BOI
5h 25m
1 stop
$358United Airlines
Tue, Sep 1 - Wed, Sep 2
Alaska Airlines Logo
4:19 pm - 11:54 pm
BOI
-
STL
6h 35m
1 stop
Alaska Airlines Logo
7:41 pm - 11:03 am
STL
-
BOI
16h 22m
1 stop
$365Alaska Airlines
Wed, Jun 3 - Sun, Jun 7

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United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Sep 1
BOI5:44 pmBoise Air Term. Gowen Fld
5h 06m
1 stop
STL11:50 pmLambert-St Louis
Sep 2
STL5:10 amLambert-St Louis
5h 25m
1 stop
BOI9:35 amBoise Air Term. Gowen Fld
$353
United Airlines
Sep 1
BOI2:44 pmBoise Air Term. Gowen Fld
8h 46m
2 stops
STL12:30 amLambert-St Louis
Sep 2
STL5:10 amLambert-St Louis
5h 25m
1 stop
BOI9:35 amBoise Air Term. Gowen Fld
$358
United Airlines
Sep 1
BOI2:44 pmBoise Air Term. Gowen Fld
8h 46m
2 stops
STL12:30 amLambert-St Louis
Sep 2
STL5:10 amLambert-St Louis
5h 25m
1 stop
BOI9:35 amBoise Air Term. Gowen Fld
$388

Frontier flights from Boise to St. Louis

Our best Frontier deals on Boise to St. Louis flight tickets
Frontier
May 28
BOI1:25 pmBoise Air Term. Gowen Fld
28h 58m
1 stop
STL7:23 pmLambert-St Louis
May 30
STL6:30 pmLambert-St Louis
19h 00m
2 stops
BOI12:30 pmBoise Air Term. Gowen Fld
$387
Frontier
Aug 27
BOI1:04 pmBoise Air Term. Gowen Fld
5h 19m
1 stop
STL7:23 pmLambert-St Louis
Aug 31
STL8:08 pmLambert-St Louis
17h 01m
1 stop
BOI12:09 pmBoise Air Term. Gowen Fld
$406

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 April 24, 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

Wed 5/27

4:05 pm-11:59 pm

1 stop6h 54m

Lambert-St Louis

Fri 5/29

8:36 am-3:07 pm

1 stop7h 31m

$317

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/19

11:39 pm-9:44 am

1 stop9h 05m

Lambert-St Louis

Tue 5/26

7:59 pm-12:04 am

1 stop5h 05m

$322

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/9

4:06 pm-11:59 pm

1 stop6h 53m

Lambert-St Louis

Tue 6/16

6:00 am-2:20 pm

1 stop9h 20m

$335

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/9

5:30 am-3:10 pm

2 stops8h 40m

Lambert-St Louis

Tue 6/16

5:35 am-10:45 am

1 stop6h 10m

$341

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/12

2:14 pm-12:02 am

1 stop8h 48m

Lambert-St Louis

Thu 5/28

7:00 am-2:20 pm

1 stop8h 20m

$344

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/9

5:30 am-3:10 pm

2 stops8h 40m

Lambert-St Louis

Tue 6/16

5:35 am-12:30 pm

2 stops7h 55m

$346
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 9/1

5:44 pm-11:50 pm

1 stop5h 06m

Lambert-St Louis

Wed 9/2

5:10 am-9:35 am

1 stop5h 25m

$353

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 6/10

3:11 pm-11:56 pm

1 stop7h 45m

Lambert-St Louis

Sat 6/13

6:00 am-2:20 pm

1 stop9h 20m

$354

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 9/1

2:44 pm-12:30 am

2 stops8h 46m

Lambert-St Louis

Wed 9/2

5:10 am-9:35 am

1 stop5h 25m

$358

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 6/3

4:19 pm-11:54 pm

1 stop6h 35m

Lambert-St Louis

Sun 6/7

7:41 pm-11:03 am

1 stop16h 22m

$365

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 far in advance should I book a flight from Boise to St. Louis?

You are more likely to see cheaper flights to St. Louis from Boise when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $426 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Boise for as low as $317 on momondo.

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 06m

Direct flights

None
The fastest flight from Boise to St. Louis takes 5h 06m
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 06m.

  • 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 $209Free CancellationRating
7.9
8,450 reviews
Search Delta flights
American AirlinesPriceFrom $278Free CancellationRating
7.1
11,666 reviews
Search American Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,332 reviews
Search Southwest flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
9,643 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
O'Fallon
Florissant
St. Peters
Collinsville
Wentzville
Alton
Fenton
Farmington
Festus
Clayton
Eureka
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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