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Cheap flights from Boise to St. Louis from $112

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 12/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
3:13 pm - 11:29 pmBOI-STL
7h 16m1 stop
Delta Logo
2:20 pm - 10:16 pmSTL-BOI
8h 56m2 stops
$296Delta
Find Deal
Tue, Dec 2 - Thu, Dec 4
Delta Logo
1:45 pm - 11:25 pmBOI-STL
8h 40m2 stops
Delta Logo
6:00 am - 12:31 pmSTL-BOI
7h 31m1 stop
$311Delta
Find Deal
Wed, Feb 11 - Sun, Feb 15
Delta Logo
5:20 am - 2:38 pmBOI-STL
8h 18m1 stop
Delta Logo
6:00 am - 12:31 pmSTL-BOI
7h 31m1 stop
$312Delta
Find Deal
Wed, Feb 11 - Sun, Feb 15
Alaska Airlines Logo
8:26 pm - 2:27 pmBOI-STL
17h 01m1 stop
Alaska Airlines Logo
7:00 am - 3:26 pmSTL-BOI
9h 26m1 stop
$317Alaska Airlines
Find Deal
Tue, Dec 2 - Thu, Dec 4
Delta Logo
10:36 am - 11:25 pmBOI-STL
11h 49m2 stops
Delta Logo
6:10 am - 6:28 pmSTL-BOI
13h 18m2 stops
$328Delta
Find Deal
Thu, Feb 12 - Mon, Feb 16
Alaska Airlines Logo
4:04 pm - 1:52 pmBOI-STL
20h 48m2 stops
Alaska Airlines Logo
2:55 pm - 12:44 pmSTL-BOI
22h 49m2 stops
$333Alaska Airlines
Find Deal
Wed, Feb 11 - Sun, Feb 15
United Airlines Logo
6:15 am - 12:39 pmBOI-STL
5h 24m1 stop
United Airlines Logo
5:29 pm - 11:28 pmSTL-BOI
6h 59m1 stop
$437United Airlines
Find Deal
Thu, Nov 20 - Mon, Nov 24
United Airlines Logo
7:11 am - 10:14 pmBOI-STL
14h 03m3 stops
United Airlines Logo
9:55 am - 8:55 pmSTL-BOI
12h 00m2 stops
$507United Airlines
Find Deal
Thu, Feb 26 - Sun, Mar 1
American Airlines Logo
2:16 pm - 11:51 pmBOI-STL
8h 35m1 stop
American Airlines Logo
6:00 am - 1:03 pmSTL-BOI
8h 03m1 stop
$547American Airlines
Find Deal
Thu, Nov 20 - Sun, Nov 23
Southwest Logo
6:15 am - 3:15 pmBOI-STL
8h 00m2 stops
Southwest Logo
8:55 am - 4:50 pmSTL-BOI
8h 55m2 stops
$755Southwest
Find Deal
Fri, Dec 19 - Sun, Dec 28

United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Nov 20
BOI6:15 amBoise Air Term. Gowen Fld
5h 24m
1 stop
STL12:39 pmLambert-St Louis
Nov 24
STL5:29 pmLambert-St Louis
6h 59m
1 stop
BOI11:28 pmBoise Air Term. Gowen Fld
$437
Find similar
United Airlines
Feb 26
BOI7:11 amBoise Air Term. Gowen Fld
14h 03m
3 stops
STL10:14 pmLambert-St Louis
Mar 1
STL9:55 amLambert-St Louis
12h 00m
2 stops
BOI8:55 pmBoise Air Term. Gowen Fld
$507
Find similar
United Airlines
Apr 9
BOI8:05 amBoise Air Term. Gowen Fld
11h 54m
2 stops
STL8:59 pmLambert-St Louis
Apr 13
STL1:30 pmLambert-St Louis
8h 45m
2 stops
BOI9:15 pmBoise Air Term. Gowen Fld
$517
Find similar

American Airlines flights from Boise to St. Louis

Our best American Airlines deals on Boise to St. Louis flight tickets
American Airlines
Nov 20
BOI2:16 pmBoise Air Term. Gowen Fld
8h 35m
1 stop
STL11:51 pmLambert-St Louis
Nov 23
STL6:00 amLambert-St Louis
8h 03m
1 stop
BOI1:03 pmBoise Air Term. Gowen Fld
$547
Find similar
American Airlines
Nov 10
BOI7:00 amBoise Air Term. Gowen Fld
7h 29m
1 stop
STL3:29 pmLambert-St Louis
Nov 11
STL3:59 pmLambert-St Louis
7h 33m
1 stop
BOI10:32 pmBoise Air Term. Gowen Fld
$880
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 November 7, 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

Tue 12/2

3:13 pm-11:29 pm

1 stop7h 16m

Lambert-St Louis

Thu 12/4

2:20 pm-10:16 pm

2 stops8h 56m

$296

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/11

1:45 pm-11:25 pm

2 stops8h 40m

Lambert-St Louis

Sun 2/15

6:00 am-12:31 pm

1 stop7h 31m

$311

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/11

5:20 am-2:38 pm

1 stop8h 18m

Lambert-St Louis

Sun 2/15

6:00 am-12:31 pm

1 stop7h 31m

$312

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 12/2

8:26 pm-2:27 pm

1 stop17h 01m

Lambert-St Louis

Thu 12/4

7:00 am-3:26 pm

1 stop9h 26m

$317

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 2/12

10:36 am-11:25 pm

2 stops11h 49m

Lambert-St Louis

Mon 2/16

6:10 am-6:28 pm

2 stops13h 18m

$328

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/11

4:04 pm-1:52 pm

2 stops20h 48m

Lambert-St Louis

Sun 2/15

2:55 pm-12:44 pm

2 stops22h 49m

$333

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 11/20

6:15 am-12:39 pm

1 stop5h 24m

Lambert-St Louis

Mon 11/24

5:29 pm-11:28 pm

1 stop6h 59m

$437

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 2/26

7:11 am-10:14 pm

3 stops14h 03m

Lambert-St Louis

Sun 3/1

9:55 am-8:55 pm

2 stops12h 00m

$507

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 11/20

2:16 pm-11:51 pm

1 stop8h 35m

Lambert-St Louis

Sun 11/23

6:00 am-1:03 pm

1 stop8h 03m

$547

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 12/19

6:15 am-3:15 pm

2 stops8h 00m

Lambert-St Louis

Sun 12/28

8:55 am-4:50 pm

2 stops8h 55m

$755

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 $334.

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 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 $434 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?

As of November 2025, prices for Boise to St. Louis flights are approximately 66% 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

Direct flights

None
There are no direct flights from Boise to St. Louis. There are no popular flight routes from Boise to St. Louis.
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  • 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 24m.

  • 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 $184Free CancellationRating
7.9
8,001 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,247 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $286Free CancellationRating
8.0
4,241 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,007 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
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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.

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