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Cheap flights from Boise to St. Louis from $131

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 5/17. 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.

Find the cheapest flights from Boise to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
1:04 pm - 7:23 pm
BOI
-
STL
5h 19m
1 stop
Frontier Logo
8:08 pm - 12:09 pm
STL
-
BOI
17h 01m
1 stop
$281Frontier
Thu, Aug 13 - Mon, Aug 17
Alaska Airlines Logo
2:57 pm - 11:59 pm
BOI
-
STL
8h 02m
1 stop
Alaska Airlines Logo
5:33 pm - 11:58 pm
STL
-
BOI
7h 25m
1 stop
$317Alaska Airlines
Tue, May 5 - Wed, May 13
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
$320Frontier
Thu, May 14 - Sat, May 16
Frontier Logo
1:22 pm - 7:23 pm
BOI
-
STL
29h 01m
1 stop
Frontier Logo
5:27 pm - 12:30 pm
STL
-
BOI
20h 03m
2 stops
$321Frontier
Sun, May 17 - Wed, May 20
Multiple Airlines Logo
1:04 pm - 7:23 pm
BOI
-
STL
5h 19m
1 stop
Multiple Airlines Logo
5:37 pm - 11:48 pm
STL
-
BOI
7h 11m
1 stop
$329Multiple Airlines
Tue, Jul 14 - Tue, Jul 21
Alaska Airlines Logo
4:19 pm - 11:54 pm
BOI
-
STL
6h 35m
1 stop
Alaska Airlines Logo
7:41 pm - 11:03 am
STL
-
BOI
16h 22m
1 stop
$357Alaska Airlines
Wed, Jun 3 - Sat, Jun 6
Frontier Logo
1:22 pm - 8:55 am
BOI
-
STL
18h 33m
2 stops
Frontier Logo
8:08 pm - 12:27 pm
STL
-
BOI
17h 19m
1 stop
$359Frontier
Thu, May 14 - Sat, May 16
Delta Logo
10:36 am - 12:25 am
BOI
-
STL
12h 49m
2 stops
Delta Logo
5:36 pm - 11:46 pm
STL
-
BOI
7h 10m
1 stop
$361Delta
Tue, May 5 - Wed, May 13
Frontier Logo
1:25 pm - 7:23 pm
BOI
-
STL
28h 58m
1 stop
Frontier Logo
8:08 pm - 12:30 pm
STL
-
BOI
17h 22m
1 stop
$379Frontier
Thu, Jun 18 - Mon, Jun 22
Southwest Logo
4:05 pm - 11:15 pm
BOI
-
STL
6h 10m
1 stop
Southwest Logo
6:00 pm - 1:00 am
STL
-
BOI
8h 00m
1 stop
$381Southwest
Tue, May 5 - Thu, May 14

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Frontier flights from Boise to St. Louis

Our best Frontier deals on Boise to St. Louis flight tickets
Frontier
Aug 13
BOI1:04 pmBoise Air Term. Gowen Fld
5h 19m
1 stop
STL7:23 pmLambert-St Louis
Aug 17
STL8:08 pmLambert-St Louis
17h 01m
1 stop
BOI12:09 pmBoise Air Term. Gowen Fld
$281
Frontier
May 14
BOI1:22 pmBoise Air Term. Gowen Fld
29h 01m
1 stop
STL7:23 pmLambert-St Louis
May 16
STL8:08 pmLambert-St Louis
17h 19m
1 stop
BOI12:27 pmBoise Air Term. Gowen Fld
$320
Frontier
May 14
BOI1:22 pmBoise Air Term. Gowen Fld
18h 33m
2 stops
STL8:55 amLambert-St Louis
May 16
STL8:08 pmLambert-St Louis
17h 19m
1 stop
BOI12:27 pmBoise Air Term. Gowen Fld
$359

United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Jun 2
BOI5:46 pmBoise Air Term. Gowen Fld
5h 11m
1 stop
STL11:57 pmLambert-St Louis
Jun 3
STL5:10 amLambert-St Louis
5h 35m
1 stop
BOI9:45 amBoise Air Term. Gowen Fld
$447
United Airlines
Apr 29
BOI6:15 amBoise Air Term. Gowen Fld
5h 53m
1 stop
STL1:08 pmLambert-St Louis
May 5
STL5:28 pmLambert-St Louis
6h 22m
1 stop
BOI10:50 pmBoise Air Term. Gowen Fld
$452
United Airlines
Jun 1
BOI5:46 pmBoise Air Term. Gowen Fld
5h 11m
1 stop
STL11:57 pmLambert-St Louis
Jun 2
STL5:10 amLambert-St Louis
5h 35m
1 stop
BOI9:45 amBoise Air Term. Gowen Fld
$471

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 April 15, 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

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 8/13

1:04 pm-7:23 pm

1 stop5h 19m

Lambert-St Louis

Mon 8/17

8:08 pm-12:09 pm

1 stop17h 01m

$281

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

2:57 pm-11:59 pm

1 stop8h 02m

Lambert-St Louis

Wed 5/13

5:33 pm-11:58 pm

1 stop7h 25m

$317

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 5/14

1:22 pm-7:23 pm

1 stop29h 01m

Lambert-St Louis

Sat 5/16

8:08 pm-12:27 pm

1 stop17h 19m

$320

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 5/17

1:22 pm-7:23 pm

1 stop29h 01m

Lambert-St Louis

Wed 5/20

5:27 pm-12:30 pm

2 stops20h 03m

$321
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 7/14

1:04 pm-7:23 pm

1 stop5h 19m

Lambert-St Louis

Tue 7/21

5:37 pm-11:48 pm

1 stop7h 11m

$329

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 6/3

4:19 pm-11:54 pm

1 stop6h 35m

Lambert-St Louis

Sat 6/6

7:41 pm-11:03 am

1 stop16h 22m

$357

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 5/14

1:22 pm-8:55 am

2 stops18h 33m

Lambert-St Louis

Sat 5/16

8:08 pm-12:27 pm

1 stop17h 19m

$359

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

10:36 am-12:25 am

2 stops12h 49m

Lambert-St Louis

Wed 5/13

5:36 pm-11:46 pm

1 stop7h 10m

$361

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 6/18

1:25 pm-7:23 pm

1 stop28h 58m

Lambert-St Louis

Mon 6/22

8:08 pm-12:30 pm

1 stop17h 22m

$379

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

Thu 5/14

6:00 pm-1:00 am

1 stop8h 00m

$381

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 $301. The month of February is another great option to travel to St. Louis, with average flight prices from Boise averaging around $376.

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 $425 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 $317 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 25m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 25m
There are no direct flights from Boise to St. Louis. There are no popular flight routes from Boise to St. Louis.
Search flight deals

Frequently asked questions about flying from Boise to St. Louis

  • 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 25m.

  • 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
8,409 reviews
Search Delta flights
Alaska AirlinesPriceFrom $278Free CancellationRating
7.9
12,244 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $278Free CancellationRating
7.1
11,584 reviews
Search American Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,328 reviews
Search Southwest flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
9,594 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
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Clayton
Festus
Eureka
Litchfield
Edwardsville
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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