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Cheap flights from Boise to St. Louis from $244

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 3/12. 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.
Delta Logo
10:39 am - 11:23 pm
BOI
-
STL
11h 44m2 stops
Delta Logo
3:31 pm - 11:59 pm
STL
-
BOI
9h 28m2 stops
$256Delta
Fri, Jan 23 - Mon, Jan 26
Frontier Logo
12:07 pm - 6:51 am
BOI
-
STL
41h 44m2 stops
Frontier Logo
3:43 pm - 1:16 pm
STL
-
BOI
22h 33m1 stop
$264Frontier
Mon, Jan 12 - Sat, Jan 17
Delta Logo
5:35 am - 1:32 pm
BOI
-
STL
6h 57m1 stop
Delta Logo
2:22 pm - 9:56 pm
STL
-
BOI
8h 34m2 stops
$296Delta
Sat, Feb 28 - Wed, Mar 4
Delta Logo
1:40 pm - 11:23 pm
BOI
-
STL
8h 43m2 stops
Delta Logo
6:00 am - 12:37 pm
STL
-
BOI
7h 37m1 stop
$311Delta
Fri, Jan 23 - Mon, Jan 26
Alaska Airlines Logo
6:23 am - 1:54 pm
BOI
-
STL
6h 31m1 stop
Alaska Airlines Logo
2:50 pm - 9:05 pm
STL
-
BOI
7h 15m1 stop
$330Alaska Airlines
Sun, Feb 1 - Wed, Feb 4
United Airlines Logo
2:37 pm - 8:58 pm
BOI
-
STL
5h 21m1 stop
United Airlines Logo
5:00 pm - 11:48 pm
STL
-
BOI
7h 48m1 stop
$335United Airlines
Sat, Jan 17 - Sun, Jan 18
Delta Logo
10:39 am - 11:25 pm
BOI
-
STL
11h 46m2 stops
Delta Logo
6:10 am - 1:34 pm
STL
-
BOI
8h 24m1 stop
$337Delta
Sun, Feb 1 - Wed, Feb 4
United Airlines Logo
10:15 am - 9:13 pm
BOI
-
STL
9h 58m2 stops
United Airlines Logo
6:30 am - 12:39 pm
STL
-
BOI
7h 09m1 stop
$340United Airlines
Sat, Jan 17 - Sun, Jan 18
Alaska Airlines Logo
1:55 pm - 10:46 pm
BOI
-
STL
7h 51m1 stop
Alaska Airlines Logo
2:50 pm - 9:05 pm
STL
-
BOI
7h 15m1 stop
$345Alaska Airlines
Fri, Jan 23 - Mon, Jan 26
Alaska Airlines Logo
6:00 pm - 1:51 pm
BOI
-
STL
18h 51m1 stop
Alaska Airlines Logo
2:47 pm - 11:59 pm
STL
-
BOI
10h 12m1 stop
$354Alaska Airlines
Mon, Feb 23 - Thu, Feb 26

Delta flights from Boise to St. Louis

Our best Delta deals on Boise to St. Louis flight tickets
Delta
Feb 28
BOI10:41 amBoise Air Term. Gowen Fld
9h 57m
2 stops
STL9:38 pmLambert-St Louis
Mar 4
STL2:22 pmLambert-St Louis
8h 34m
2 stops
BOI9:56 pmBoise Air Term. Gowen Fld
$256
Find similar
Delta
Feb 28
BOI5:35 amBoise Air Term. Gowen Fld
6h 57m
1 stop
STL1:32 pmLambert-St Louis
Mar 4
STL2:22 pmLambert-St Louis
8h 34m
2 stops
BOI9:56 pmBoise Air Term. Gowen Fld
$296
Find similar
Delta
Jan 29
BOI10:39 amBoise Air Term. Gowen Fld
11h 46m
2 stops
STL11:25 pmLambert-St Louis
Feb 2
STL6:40 amLambert-St Louis
12h 48m
2 stops
BOI6:28 pmBoise Air Term. Gowen Fld
$327
Find similar

Alaska Airlines flights from Boise to St. Louis

Our best Alaska Airlines deals on Boise to St. Louis flight tickets
Alaska Airlines
Feb 28
BOI6:28 amBoise Air Term. Gowen Fld
6h 23m
1 stop
STL1:51 pmLambert-St Louis
Mar 4
STL7:00 amLambert-St Louis
8h 58m
1 stop
BOI2:58 pmBoise Air Term. Gowen Fld
$295
Find similar
Alaska Airlines
Feb 1
BOI6:23 amBoise Air Term. Gowen Fld
6h 31m
1 stop
STL1:54 pmLambert-St Louis
Feb 4
STL2:50 pmLambert-St Louis
7h 15m
1 stop
BOI9:05 pmBoise Air Term. Gowen Fld
$330
Find similar
Alaska Airlines
Jan 23
BOI1:55 pmBoise Air Term. Gowen Fld
7h 51m
1 stop
STL10:46 pmLambert-St Louis
Jan 26
STL2:50 pmLambert-St Louis
7h 15m
1 stop
BOI9:05 pmBoise Air Term. Gowen Fld
$345
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 28, 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

Fri 1/23

10:39 am-11:23 pm

2 stops11h 44m

Lambert-St Louis

Mon 1/26

3:31 pm-11:59 pm

2 stops9h 28m

$256

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 1/12

12:07 pm-6:51 am

2 stops41h 44m

Lambert-St Louis

Sat 1/17

3:43 pm-1:16 pm

1 stop22h 33m

$264

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 2/28

5:35 am-1:32 pm

1 stop6h 57m

Lambert-St Louis

Wed 3/4

2:22 pm-9:56 pm

2 stops8h 34m

$296

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 1/23

1:40 pm-11:23 pm

2 stops8h 43m

Lambert-St Louis

Mon 1/26

6:00 am-12:37 pm

1 stop7h 37m

$311

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 2/1

6:23 am-1:54 pm

1 stop6h 31m

Lambert-St Louis

Wed 2/4

2:50 pm-9:05 pm

1 stop7h 15m

$330

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 1/17

2:37 pm-8:58 pm

1 stop5h 21m

Lambert-St Louis

Sun 1/18

5:00 pm-11:48 pm

1 stop7h 48m

$335

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 2/1

10:39 am-11:25 pm

2 stops11h 46m

Lambert-St Louis

Wed 2/4

6:10 am-1:34 pm

1 stop8h 24m

$337

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 1/17

10:15 am-9:13 pm

2 stops9h 58m

Lambert-St Louis

Sun 1/18

6:30 am-12:39 pm

1 stop7h 09m

$340

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 1/23

1:55 pm-10:46 pm

1 stop7h 51m

Lambert-St Louis

Mon 1/26

2:50 pm-9:05 pm

1 stop7h 15m

$345

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 2/23

6:00 pm-1:51 pm

1 stop18h 51m

Lambert-St Louis

Thu 2/26

2:47 pm-11:59 pm

1 stop10h 12m

$354

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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 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

  • 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 $179Free CancellationRating
7.9
8,019 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,073 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,551 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,113 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
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Glencoe
Eureka
Festus
Edwardsville
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.

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