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Cheap flights from Boise to St. Louis from $128

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 12/24. 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.
Alaska Airlines Logo
1:55 pm - 1:54 pm
BOI
-
STL
22h 59m1 stop
Alaska Airlines Logo
2:50 pm - 11:01 pm
STL
-
BOI
9h 11m1 stop
$325Alaska Airlines
Sun, Jan 25 - Thu, Jan 29
Delta Logo
5:20 am - 2:56 pm
BOI
-
STL
8h 36m1 stop
Delta Logo
3:38 pm - 8:55 pm
STL
-
BOI
6h 17m1 stop
$328Delta
Tue, Feb 17 - Thu, Feb 19
Southwest Logo
3:55 pm - 9:40 pm
BOI
-
STL
4h 45m1 stop
Southwest Logo
9:40 am - 3:50 pm
STL
-
BOI
7h 10m2 stops
$338Southwest
Tue, Feb 17 - Thu, Feb 19
Southwest Logo
5:30 am - 5:45 pm
BOI
-
STL
11h 15m2 stops
Southwest Logo
9:40 am - 3:50 pm
STL
-
BOI
7h 10m2 stops
$349Southwest
Tue, Feb 17 - Thu, Feb 19
Alaska Airlines Logo
9:50 pm - 11:59 pm
BOI
-
STL
25h 09m1 stop
Alaska Airlines Logo
7:00 am - 1:49 pm
STL
-
BOI
7h 49m1 stop
$379Alaska Airlines
Sun, Jan 4 - Tue, Jan 6
Alaska Airlines Logo
9:02 am - 1:54 pm
BOI
-
STL
27h 52m1 stop
Alaska Airlines Logo
2:50 pm - 11:01 pm
STL
-
BOI
9h 11m1 stop
$390Alaska Airlines
Sun, Jan 25 - Thu, Jan 29
Alaska Airlines Logo
4:30 pm - 11:55 pm
BOI
-
STL
6h 25m1 stop
Alaska Airlines Logo
7:00 am - 1:47 pm
STL
-
BOI
7h 47m1 stop
$406Alaska Airlines
Thu, Apr 9 - Mon, Apr 13
Alaska Airlines Logo
9:50 pm - 11:59 pm
BOI
-
STL
25h 09m1 stop
Alaska Airlines Logo
7:00 am - 5:01 pm
STL
-
BOI
11h 01m2 stops
$408Alaska Airlines
Sun, Jan 4 - Tue, Jan 6
Alaska Airlines Logo
1:58 pm - 10:59 pm
BOI
-
STL
8h 01m1 stop
Alaska Airlines Logo
11:05 am - 11:59 pm
STL
-
BOI
13h 54m2 stops
$418Alaska Airlines
Sun, Jan 25 - Thu, Jan 29
Alaska Airlines Logo
6:00 pm - 2:11 pm
BOI
-
STL
19h 11m1 stop
Alaska Airlines Logo
7:00 am - 1:47 pm
STL
-
BOI
7h 47m1 stop
$426Alaska Airlines
Thu, Apr 9 - Sun, Apr 12

Delta flights from Boise to St. Louis

Our best Delta deals on Boise to St. Louis flight tickets
Delta
Feb 17
BOI5:20 amBoise Air Term. Gowen Fld
8h 36m
1 stop
STL2:56 pmLambert-St Louis
Feb 19
STL3:38 pmLambert-St Louis
6h 17m
1 stop
BOI8:55 pmBoise Air Term. Gowen Fld
$328
Find similar
Delta
Jun 1
BOI11:30 pmBoise Air Term. Gowen Fld
7h 37m
1 stop
STL8:07 amLambert-St Louis
Jun 7
STL6:30 amLambert-St Louis
5h 29m
1 stop
BOI10:59 amBoise Air Term. Gowen Fld
$967
Find similar
Delta
Jun 1
BOI7:30 pmBoise Air Term. Gowen Fld
12h 10m
2 stops
STL8:40 amLambert-St Louis
Jun 7
STL3:50 pmLambert-St Louis
9h 06m
2 stops
BOI11:56 pmBoise Air Term. Gowen Fld
$1,835
Find similar

Southwest flights from Boise to St. Louis

Our best Southwest deals on Boise to St. Louis flight tickets
Southwest
Feb 17
BOI3:55 pmBoise Air Term. Gowen Fld
4h 45m
1 stop
STL9:40 pmLambert-St Louis
Feb 19
STL9:40 amLambert-St Louis
7h 10m
2 stops
BOI3:50 pmBoise Air Term. Gowen Fld
$338
Find similar
Southwest
Feb 17
BOI5:30 amBoise Air Term. Gowen Fld
11h 15m
2 stops
STL5:45 pmLambert-St Louis
Feb 19
STL9:40 amLambert-St Louis
7h 10m
2 stops
BOI3:50 pmBoise Air Term. Gowen Fld
$349
Find similar
Southwest
Apr 9
BOI6:00 amBoise Air Term. Gowen Fld
8h 55m
2 stops
STL3:55 pmLambert-St Louis
Apr 13
STL8:25 amLambert-St Louis
8h 15m
1 stop
BOI3:40 pmBoise Air Term. Gowen Fld
$432
Find similar

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 December 8, 2025.
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

Sun 1/25

1:55 pm-1:54 pm

1 stop22h 59m

Lambert-St Louis

Thu 1/29

2:50 pm-11:01 pm

1 stop9h 11m

$325

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 2/17

5:20 am-2:56 pm

1 stop8h 36m

Lambert-St Louis

Thu 2/19

3:38 pm-8:55 pm

1 stop6h 17m

$328

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 2/17

3:55 pm-9:40 pm

1 stop4h 45m

Lambert-St Louis

Thu 2/19

9:40 am-3:50 pm

2 stops7h 10m

$338

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 2/17

5:30 am-5:45 pm

2 stops11h 15m

Lambert-St Louis

Thu 2/19

9:40 am-3:50 pm

2 stops7h 10m

$349

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 1/4

9:50 pm-11:59 pm

1 stop25h 09m

Lambert-St Louis

Tue 1/6

7:00 am-1:49 pm

1 stop7h 49m

$379

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 1/25

9:02 am-1:54 pm

1 stop27h 52m

Lambert-St Louis

Thu 1/29

2:50 pm-11:01 pm

1 stop9h 11m

$390

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 4/9

4:30 pm-11:55 pm

1 stop6h 25m

Lambert-St Louis

Mon 4/13

7:00 am-1:47 pm

1 stop7h 47m

$406

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 1/4

9:50 pm-11:59 pm

1 stop25h 09m

Lambert-St Louis

Tue 1/6

7:00 am-5:01 pm

2 stops11h 01m

$408

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 1/25

1:58 pm-10:59 pm

1 stop8h 01m

Lambert-St Louis

Thu 1/29

11:05 am-11:59 pm

2 stops13h 54m

$418

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 4/9

6:00 pm-2:11 pm

1 stop19h 11m

Lambert-St Louis

Sun 4/12

7:00 am-1:47 pm

1 stop7h 47m

$426

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 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 $310.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $391. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $561. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Boise in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $410 when looking at flights departing in the afternoon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $496 per ticket.

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

As of December 2025, prices for Boise to St. Louis flights are approximately 47% cheaper 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 08m

Direct flights

None
The fastest flight from Boise to St. Louis takes 5h 08m
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 4h 45m.

  • 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 $179Free CancellationRating
7.9
8,013 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,411 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,252 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,076 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
Fenton
Wentzville
St. Peters
Collinsville
Alton
Farmington
Festus
Clayton
Glencoe
Edwardsville
Eureka
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.
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