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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

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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.
Frontier Logo
12:03 pm - 9:48 am
BOI
-
STL
20h 45m
1 stop
Frontier Logo
8:17 pm - 11:08 am
STL
-
BOI
15h 51m
1 stop
$227Frontier
Thu, Apr 9 - Sat, Apr 18
Delta Logo
10:41 am - 12:25 am
BOI
-
STL
12h 44m
2 stops
Delta Logo
5:00 pm - 9:56 pm
STL
-
BOI
5h 56m
1 stop
$265Delta
Mon, Apr 20 - Sat, Apr 25
Delta Logo
6:16 pm - 12:25 am
BOI
-
STL
5h 09m
1 stop
Delta Logo
5:00 pm - 9:56 pm
STL
-
BOI
5h 56m
1 stop
$270Delta
Mon, Apr 20 - Sat, Apr 25
Delta Logo
10:35 am - 12:21 am
BOI
-
STL
12h 46m
2 stops
Delta Logo
7:15 am - 6:43 pm
STL
-
BOI
12h 28m
2 stops
$274Delta
Wed, Apr 1 - Wed, Apr 8
Delta Logo
8:30 am - 5:26 pm
BOI
-
STL
7h 56m
1 stop
Delta Logo
4:41 pm - 10:28 pm
STL
-
BOI
6h 47m
1 stop
$276Delta
Wed, Apr 22 - Mon, Apr 27
American Airlines Logo
1:39 pm - 10:58 pm
BOI
-
STL
8h 19m
1 stop
American Airlines Logo
5:51 am - 12:49 pm
STL
-
BOI
7h 58m
1 stop
$277American Airlines
Wed, Apr 1 - Wed, Apr 8
Delta Logo
1:45 pm - 12:21 am
BOI
-
STL
9h 36m
2 stops
Delta Logo
2:12 pm - 10:04 pm
STL
-
BOI
8h 52m
2 stops
$280Delta
Wed, Apr 1 - Mon, Apr 6
Southwest Logo
3:15 pm - 9:45 pm
BOI
-
STL
5h 30m
1 stop
Southwest Logo
6:10 am - 4:15 pm
STL
-
BOI
11h 05m
2 stops
$288Southwest
Tue, Apr 21 - Sat, Apr 25
Frontier Logo
12:03 pm - 12:21 pm
BOI
-
STL
47h 18m
2 stops
Frontier Logo
8:17 pm - 11:08 am
STL
-
BOI
15h 51m
1 stop
$292Frontier
Thu, Apr 9 - Sat, Apr 18
United Airlines Logo
6:15 am - 1:19 pm
BOI
-
STL
6h 04m
1 stop
United Airlines Logo
2:40 pm - 9:34 pm
STL
-
BOI
7h 54m
1 stop
$294United Airlines
Sat, Mar 28 - Sat, Apr 4

American Airlines flights from Boise to St. Louis

Our best American Airlines deals on Boise to St. Louis flight tickets
American Airlines
Apr 1
BOI1:39 pmBoise Air Term. Gowen Fld
8h 19m
1 stop
STL10:58 pmLambert-St Louis
Apr 8
STL5:51 amLambert-St Louis
7h 58m
1 stop
BOI12:49 pmBoise Air Term. Gowen Fld
$277
American Airlines
Apr 30
BOI1:41 pmBoise Air Term. Gowen Fld
8h 18m
1 stop
STL10:59 pmLambert-St Louis
May 2
STL5:20 amLambert-St Louis
8h 43m
1 stop
BOI1:03 pmBoise Air Term. Gowen Fld
$344
American Airlines
Apr 3
BOI1:31 pmBoise Air Term. Gowen Fld
6h 40m
1 stop
STL9:11 pmLambert-St Louis
Apr 6
STL4:13 pmLambert-St Louis
7h 10m
1 stop
BOI10:23 pmBoise Air Term. Gowen Fld
$369

United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Mar 28
BOI6:15 amBoise Air Term. Gowen Fld
6h 04m
1 stop
STL1:19 pmLambert-St Louis
Apr 4
STL2:40 pmLambert-St Louis
7h 54m
1 stop
BOI9:34 pmBoise Air Term. Gowen Fld
$294
United Airlines
Mar 28
BOI6:15 amBoise Air Term. Gowen Fld
6h 04m
1 stop
STL1:19 pmLambert-St Louis
Apr 4
STL1:10 pmLambert-St Louis
9h 24m
2 stops
BOI9:34 pmBoise Air Term. Gowen Fld
$299
United Airlines
Apr 1
BOI6:15 amBoise Air Term. Gowen Fld
5h 53m
1 stop
STL1:08 pmLambert-St Louis
Apr 6
STL6:05 pmLambert-St Louis
5h 30m
1 stop
BOI10:35 pmBoise Air Term. Gowen Fld
$327

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 3, 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

Thu 4/9

12:03 pm-9:48 am

1 stop20h 45m

Lambert-St Louis

Sat 4/18

8:17 pm-11:08 am

1 stop15h 51m

$227

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 4/20

10:41 am-12:25 am

2 stops12h 44m

Lambert-St Louis

Sat 4/25

5:00 pm-9:56 pm

1 stop5h 56m

$265

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 4/20

6:16 pm-12:25 am

1 stop5h 09m

Lambert-St Louis

Sat 4/25

5:00 pm-9:56 pm

1 stop5h 56m

$270

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 4/1

10:35 am-12:21 am

2 stops12h 46m

Lambert-St Louis

Wed 4/8

7:15 am-6:43 pm

2 stops12h 28m

$274

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 4/22

8:30 am-5:26 pm

1 stop7h 56m

Lambert-St Louis

Mon 4/27

4:41 pm-10:28 pm

1 stop6h 47m

$276

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 4/1

1:39 pm-10:58 pm

1 stop8h 19m

Lambert-St Louis

Wed 4/8

5:51 am-12:49 pm

1 stop7h 58m

$277

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 4/1

1:45 pm-12:21 am

2 stops9h 36m

Lambert-St Louis

Mon 4/6

2:12 pm-10:04 pm

2 stops8h 52m

$280

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 4/21

3:15 pm-9:45 pm

1 stop5h 30m

Lambert-St Louis

Sat 4/25

6:10 am-4:15 pm

2 stops11h 05m

$288

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 4/9

12:03 pm-12:21 pm

2 stops47h 18m

Lambert-St Louis

Sat 4/18

8:17 pm-11:08 am

1 stop15h 51m

$292

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 3/28

6:15 am-1:19 pm

1 stop6h 04m

Lambert-St Louis

Sat 4/4

2:40 pm-9:34 pm

1 stop7h 54m

$294

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 $294. The month of April is another great option to travel to St. Louis, with average flight prices from Boise averaging around $299.

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 $402 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 $290 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 49m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 49m
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 49m.

  • 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
8,242 reviews
Search Delta flights
American AirlinesPriceFrom $278Free CancellationRating
7.1
11,375 reviews
Search American Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,302 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,377 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
St. Peters
Wentzville
Collinsville
Alton
Fenton
Farmington
Edwardsville
Festus
Clayton
Eureka
Litchfield
Glencoe
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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