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Cheap flights from Boise to St. Louis from $117

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 4/9. 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
1 adult, Economy, 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.
Southwest Logo
4:05 pm - 11:15 pm
BOI
-
STL
6h 10m
1 stop
Southwest Logo
6:30 pm - 12:25 am
STL
-
BOI
6h 55m
1 stop
$263Southwest
Tue, May 5 - Wed, May 6
Southwest Logo
2:00 pm - 10:00 pm
BOI
-
STL
7h 00m
1 stop
Southwest Logo
5:40 pm - 12:25 am
STL
-
BOI
7h 45m
2 stops
$268Southwest
Tue, May 5 - Wed, May 6
American Airlines Logo
2:14 pm - 11:59 pm
BOI
-
STL
8h 45m
1 stop
American Airlines Logo
5:51 am - 12:49 pm
STL
-
BOI
7h 58m
1 stop
$290American Airlines
Tue, Apr 14 - Thu, Apr 23
Frontier Logo
1:22 pm - 7:23 pm
BOI
-
STL
29h 01m
1 stop
Frontier Logo
8:08 pm - 12:27 pm
STL
-
BOI
17h 19m
1 stop
$305Frontier
Thu, May 7 - Mon, May 11
Alaska Airlines Logo
2:22 pm - 11:59 pm
BOI
-
STL
8h 37m
1 stop
Alaska Airlines Logo
7:00 am - 3:29 pm
STL
-
BOI
9h 29m
1 stop
$317Alaska Airlines
Tue, Apr 14 - Wed, Apr 15
Frontier Logo
1:22 pm - 7:23 pm
BOI
-
STL
29h 01m
1 stop
Frontier Logo
9:18 pm - 12:27 pm
STL
-
BOI
16h 09m
2 stops
$321Frontier
Thu, May 7 - Mon, May 11
Delta Logo
10:41 am - 12:25 am
BOI
-
STL
12h 44m
2 stops
Delta Logo
9:26 am - 2:26 pm
STL
-
BOI
6h 00m
1 stop
$325Delta
Tue, Apr 14 - Thu, Apr 23
Alaska Airlines Logo
4:38 pm - 11:59 pm
BOI
-
STL
6h 21m
1 stop
Alaska Airlines Logo
4:46 pm - 11:02 pm
STL
-
BOI
7h 16m
1 stop
$329Alaska Airlines
Tue, May 5 - Wed, May 6
United Airlines Logo
2:26 pm - 8:43 pm
BOI
-
STL
5h 17m
1 stop
United Airlines Logo
8:46 am - 10:16 pm
STL
-
BOI
14h 30m
2 stops
$358United Airlines
Tue, May 5 - Wed, May 6
United Airlines Logo
8:28 am - 8:43 pm
BOI
-
STL
11h 15m
2 stops
United Airlines Logo
8:46 am - 10:16 pm
STL
-
BOI
14h 30m
2 stops
$364United Airlines
Tue, May 5 - Wed, May 6

Alaska Airlines flights from Boise to St. Louis

Our best Alaska Airlines deals on Boise to St. Louis flight tickets
Alaska Airlines
Apr 14
BOI2:22 pmBoise Air Term. Gowen Fld
8h 37m
1 stop
STL11:59 pmLambert-St Louis
Apr 15
STL7:00 amLambert-St Louis
9h 29m
1 stop
BOI3:29 pmBoise Air Term. Gowen Fld
$317
Alaska Airlines
May 5
BOI4:38 pmBoise Air Term. Gowen Fld
6h 21m
1 stop
STL11:59 pmLambert-St Louis
May 6
STL4:46 pmLambert-St Louis
7h 16m
1 stop
BOI11:02 pmBoise Air Term. Gowen Fld
$329
Alaska Airlines
May 5
BOI2:57 pmBoise Air Term. Gowen Fld
8h 02m
1 stop
STL11:59 pmLambert-St Louis
May 6
STL4:46 pmLambert-St Louis
8h 13m
1 stop
BOI11:59 pmBoise Air Term. Gowen Fld
$394

Southwest flights from Boise to St. Louis

Our best Southwest deals on Boise to St. Louis flight tickets
Southwest
May 5
BOI4:05 pmBoise Air Term. Gowen Fld
6h 10m
1 stop
STL11:15 pmLambert-St Louis
May 6
STL6:30 pmLambert-St Louis
6h 55m
1 stop
BOI12:25 amBoise Air Term. Gowen Fld
$263
Southwest
May 5
BOI2:00 pmBoise Air Term. Gowen Fld
7h 00m
1 stop
STL10:00 pmLambert-St Louis
May 6
STL5:40 pmLambert-St Louis
7h 45m
2 stops
BOI12:25 amBoise Air Term. Gowen Fld
$268
Southwest
Jun 3
BOI4:05 pmBoise Air Term. Gowen Fld
6h 10m
1 stop
STL11:15 pmLambert-St Louis
Jun 7
STL7:35 pmLambert-St Louis
6h 45m
1 stop
BOI1:20 amBoise Air Term. Gowen Fld
$366

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 March 25, 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
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

4:05 pm-11:15 pm

1 stop6h 10m

Lambert-St Louis

Wed 5/6

6:30 pm-12:25 am

1 stop6h 55m

$263

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

2:00 pm-10:00 pm

1 stop7h 00m

Lambert-St Louis

Wed 5/6

5:40 pm-12:25 am

2 stops7h 45m

$268

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 4/14

2:14 pm-11:59 pm

1 stop8h 45m

Lambert-St Louis

Thu 4/23

5:51 am-12:49 pm

1 stop7h 58m

$290

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 5/7

1:22 pm-7:23 pm

1 stop29h 01m

Lambert-St Louis

Mon 5/11

8:08 pm-12:27 pm

1 stop17h 19m

$305

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 4/14

2:22 pm-11:59 pm

1 stop8h 37m

Lambert-St Louis

Wed 4/15

7:00 am-3:29 pm

1 stop9h 29m

$317

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 5/7

1:22 pm-7:23 pm

1 stop29h 01m

Lambert-St Louis

Mon 5/11

9:18 pm-12:27 pm

2 stops16h 09m

$321

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 4/14

10:41 am-12:25 am

2 stops12h 44m

Lambert-St Louis

Thu 4/23

9:26 am-2:26 pm

1 stop6h 00m

$325

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

4:38 pm-11:59 pm

1 stop6h 21m

Lambert-St Louis

Wed 5/6

4:46 pm-11:02 pm

1 stop7h 16m

$329

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

2:26 pm-8:43 pm

1 stop5h 17m

Lambert-St Louis

Wed 5/6

8:46 am-10:16 pm

2 stops14h 30m

$358

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

8:28 am-8:43 pm

2 stops11h 15m

Lambert-St Louis

Wed 5/6

8:46 am-10:16 pm

2 stops14h 30m

$364

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 $294. The month of April is another great option to travel to St. Louis, with average flight prices from Boise averaging around $336.

How far in advance should I book a flight 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 $408 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 $304 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

4h 57m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 57m
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 57m.

  • 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
8,327 reviews
Search Delta flights
Alaska AirlinesPriceFrom $278Free CancellationRating
7.9
12,108 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $278Free CancellationRating
7.1
11,494 reviews
Search American Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,332 reviews
Search Southwest flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
9,477 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
Florissant
Maryland Heights
O'Fallon
Collinsville
St. Peters
Wentzville
Alton
Fenton
Farmington
Clayton
Festus
Edwardsville
Eureka
Litchfield
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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