Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Boise to St. Louis from $119

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 4/11. 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.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Boise to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
5:20 am - 2:54 pm
BOI
-
STL
8h 34m
1 stop
Delta Logo
6:00 am - 12:28 pm
STL
-
BOI
7h 28m
1 stop
$282Delta
Tue, Feb 24 - Thu, Feb 26
United Airlines Logo
6:25 am - 1:14 pm
BOI
-
STL
5h 49m
1 stop
United Airlines Logo
5:29 pm - 11:38 pm
STL
-
BOI
7h 09m
1 stop
$317United Airlines
Wed, Feb 18 - Sat, Feb 21
Delta Logo
10:45 am - 5:42 pm
BOI
-
STL
5h 57m
1 stop
Delta Logo
3:40 pm - 8:55 pm
STL
-
BOI
6h 15m
1 stop
$327Delta
Thu, Feb 26 - Mon, Mar 2
Delta Logo
1:51 pm - 11:23 pm
BOI
-
STL
8h 32m
2 stops
Delta Logo
2:22 pm - 11:45 pm
STL
-
BOI
10h 23m
2 stops
$330Delta
Fri, Feb 27 - Mon, Mar 2
Southwest Logo
11:50 am - 7:05 pm
BOI
-
STL
6h 15m
1 stop
Southwest Logo
4:20 pm - 1:00 am
STL
-
BOI
9h 40m
2 stops
$333Southwest
Tue, Feb 24 - Thu, Feb 26
Delta Logo
5:50 am - 5:42 pm
BOI
-
STL
10h 52m
2 stops
Delta Logo
2:22 pm - 9:56 pm
STL
-
BOI
8h 34m
2 stops
$335Delta
Thu, Feb 26 - Mon, Mar 2
Delta Logo
10:41 am - 12:25 am
BOI
-
STL
12h 44m
2 stops
Delta Logo
3:40 pm - 8:55 pm
STL
-
BOI
6h 15m
1 stop
$340Delta
Thu, Feb 26 - Mon, Mar 2
American Airlines Logo
1:29 pm - 10:14 pm
BOI
-
STL
7h 45m
1 stop
American Airlines Logo
6:00 am - 12:38 pm
STL
-
BOI
7h 38m
1 stop
$343American Airlines
Fri, May 8 - Sun, May 10
Delta Logo
1:51 pm - 11:23 pm
BOI
-
STL
8h 32m
2 stops
Delta Logo
3:40 pm - 8:55 pm
STL
-
BOI
6h 15m
1 stop
$348Delta
Fri, Feb 27 - Mon, Mar 2
Southwest Logo
7:05 am - 7:05 pm
BOI
-
STL
11h 00m
2 stops
Southwest Logo
3:15 pm - 1:00 am
STL
-
BOI
10h 45m
2 stops
$368Southwest
Tue, Feb 24 - Thu, Feb 26

Delta flights from Boise to St. Louis

Our best Delta deals on Boise to St. Louis flight tickets
Delta
Feb 24
BOI5:20 amBoise Air Term. Gowen Fld
8h 34m
1 stop
STL2:54 pmLambert-St Louis
Feb 26
STL6:00 amLambert-St Louis
7h 28m
1 stop
BOI12:28 pmBoise Air Term. Gowen Fld
$282
Delta
Feb 26
BOI10:45 amBoise Air Term. Gowen Fld
5h 57m
1 stop
STL5:42 pmLambert-St Louis
Mar 2
STL3:40 pmLambert-St Louis
6h 15m
1 stop
BOI8:55 pmBoise Air Term. Gowen Fld
$327
Delta
Feb 27
BOI1:51 pmBoise Air Term. Gowen Fld
8h 32m
2 stops
STL11:23 pmLambert-St Louis
Mar 2
STL2:22 pmLambert-St Louis
10h 23m
2 stops
BOI11:45 pmBoise Air Term. Gowen Fld
$330

Southwest flights from Boise to St. Louis

Our best Southwest deals on Boise to St. Louis flight tickets
Southwest
Feb 24
BOI11:50 amBoise Air Term. Gowen Fld
6h 15m
1 stop
STL7:05 pmLambert-St Louis
Feb 26
STL4:20 pmLambert-St Louis
9h 40m
2 stops
BOI1:00 amBoise Air Term. Gowen Fld
$333
Southwest
Feb 24
BOI7:05 amBoise Air Term. Gowen Fld
11h 00m
2 stops
STL7:05 pmLambert-St Louis
Feb 26
STL3:15 pmLambert-St Louis
10h 45m
2 stops
BOI1:00 amBoise Air Term. Gowen Fld
$368
Southwest
May 14
BOI4:20 pmBoise Air Term. Gowen Fld
4h 45m
1 stop
STL10:05 pmLambert-St Louis
May 17
STL6:15 amLambert-St Louis
8h 20m
1 stop
BOI1:35 pmBoise Air Term. Gowen Fld
$423

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 January 28, 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

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 2/24

5:20 am-2:54 pm

1 stop8h 34m

Lambert-St Louis

Thu 2/26

6:00 am-12:28 pm

1 stop7h 28m

$282

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/18

6:25 am-1:14 pm

1 stop5h 49m

Lambert-St Louis

Sat 2/21

5:29 pm-11:38 pm

1 stop7h 09m

$317

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 2/26

10:45 am-5:42 pm

1 stop5h 57m

Lambert-St Louis

Mon 3/2

3:40 pm-8:55 pm

1 stop6h 15m

$327

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 2/27

1:51 pm-11:23 pm

2 stops8h 32m

Lambert-St Louis

Mon 3/2

2:22 pm-11:45 pm

2 stops10h 23m

$330

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 2/24

11:50 am-7:05 pm

1 stop6h 15m

Lambert-St Louis

Thu 2/26

4:20 pm-1:00 am

2 stops9h 40m

$333

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 2/26

5:50 am-5:42 pm

2 stops10h 52m

Lambert-St Louis

Mon 3/2

2:22 pm-9:56 pm

2 stops8h 34m

$335

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 2/26

10:41 am-12:25 am

2 stops12h 44m

Lambert-St Louis

Mon 3/2

3:40 pm-8:55 pm

1 stop6h 15m

$340

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 5/8

1:29 pm-10:14 pm

1 stop7h 45m

Lambert-St Louis

Sun 5/10

6:00 am-12:38 pm

1 stop7h 38m

$343

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 2/27

1:51 pm-11:23 pm

2 stops8h 32m

Lambert-St Louis

Mon 3/2

3:40 pm-8:55 pm

1 stop6h 15m

$348

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 2/24

7:05 am-7:05 pm

2 stops11h 00m

Lambert-St Louis

Thu 2/26

3:15 pm-1:00 am

2 stops10h 45m

$368

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

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 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 April is another great option to travel to St. Louis, with average flight prices from Boise averaging around $322.

How have Boise to St. Louis flight prices changed over time?

As of January 2026, prices for Boise to St. Louis flights are approximately 83% more expensive when compared to flights at the same time last year.

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 37m

Direct flights

None
The fastest flight from Boise to St. Louis takes 5h 37m
There are no direct flights from Boise to St. Louis. There are no popular flight routes from Boise to St. Louis.
Search flight deals

  • 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 37m.

  • 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
8,120 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,198 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,799 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,268 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,206 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
Collinsville
Fenton
St. Peters
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Glencoe
Litchfield
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.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 2/27
Fri 3/6
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States