Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Boise to St. Louis from $111

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 8/20. 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

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
2:50 pm - 11:17 am
BOI
-
STL
19h 27m
1 stop
Frontier Logo
12:17 pm - 1:55 pm
STL
-
BOI
26h 38m
1 stop
$260Frontier
Thu, Sep 10 - Wed, Sep 16
Frontier Logo
2:50 pm - 11:32 am
BOI
-
STL
19h 42m
1 stop
Frontier Logo
12:17 pm - 1:55 pm
STL
-
BOI
26h 38m
1 stop
$281Frontier
Fri, Sep 11 - Wed, Sep 16
Frontier Logo
2:50 pm - 11:32 am
BOI
-
STL
19h 42m
1 stop
Frontier Logo
12:17 pm - 2:57 pm
STL
-
BOI
27h 40m
1 stop
$291Frontier
Mon, Oct 5 - Wed, Oct 7
Delta Logo
10:37 am - 11:23 pm
BOI
-
STL
11h 46m
2 stops
Delta Logo
7:10 am - 6:37 pm
STL
-
BOI
12h 27m
2 stops
$323Delta
Tue, Nov 10 - Thu, Nov 19
Delta Logo
6:45 am - 5:44 pm
BOI
-
STL
9h 59m
2 stops
Delta Logo
2:20 pm - 10:26 pm
STL
-
BOI
9h 06m
2 stops
$364Delta
Sun, Nov 8 - Wed, Nov 18
Southwest Logo
1:10 pm - 6:35 pm
BOI
-
STL
4h 25m
1 stop
Southwest Logo
6:35 am - 11:00 am
STL
-
BOI
5h 25m
1 stop
$369Southwest
Tue, Nov 10 - Thu, Nov 19
Southwest Logo
3:55 pm - 10:25 pm
BOI
-
STL
5h 30m
1 stop
Southwest Logo
6:00 am - 12:00 pm
STL
-
BOI
7h 00m
1 stop
$369Southwest
Mon, Nov 9 - Thu, Nov 19
United Airlines Logo
2:41 pm - 11:31 pm
BOI
-
STL
7h 50m
1 stop
United Airlines Logo
4:40 pm - 9:45 pm
STL
-
BOI
6h 05m
1 stop
$369United Airlines
Thu, Sep 10 - Tue, Sep 15
Delta Logo
2:50 pm - 11:16 pm
BOI
-
STL
7h 26m
1 stop
Delta Logo
5:47 pm - 11:59 pm
STL
-
BOI
7h 12m
1 stop
$369Delta
Sat, Sep 12 - Mon, Sep 28
United Airlines Logo
5:30 pm - 11:44 pm
BOI
-
STL
5h 14m
1 stop
United Airlines Logo
5:10 am - 1:03 pm
STL
-
BOI
8h 53m
2 stops
$425United Airlines
Mon, Oct 5 - Wed, Oct 7

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Frontier flights from Boise to St. Louis

Our best Frontier deals on Boise to St. Louis flight tickets
Frontier
Sep 10
BOI2:50 pmBoise Air Term. Gowen Fld
19h 27m
1 stop
STL11:17 amLambert-St Louis
Sep 16
STL12:17 pmLambert-St Louis
26h 38m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$260
Frontier
Sep 11
BOI2:50 pmBoise Air Term. Gowen Fld
19h 42m
1 stop
STL11:32 amLambert-St Louis
Sep 16
STL12:17 pmLambert-St Louis
26h 38m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$281
Frontier
Oct 5
BOI2:50 pmBoise Air Term. Gowen Fld
19h 42m
1 stop
STL11:32 amLambert-St Louis
Oct 7
STL12:17 pmLambert-St Louis
27h 40m
1 stop
BOI2:57 pmBoise Air Term. Gowen Fld
$291

Alaska Airlines flights from Boise to St. Louis

Our best Alaska Airlines deals on Boise to St. Louis flight tickets
Alaska Airlines
Sep 10
BOI4:20 pmBoise Air Term. Gowen Fld
6h 39m
1 stop
STL11:59 pmLambert-St Louis
Sep 16
STL6:29 amLambert-St Louis
10h 03m
2 stops
BOI3:32 pmBoise Air Term. Gowen Fld
$331
Alaska Airlines
Sep 11
BOI8:25 pmBoise Air Term. Gowen Fld
19h 45m
1 stop
STL5:10 pmLambert-St Louis
Sep 15
STL6:29 amLambert-St Louis
10h 03m
2 stops
BOI3:32 pmBoise Air Term. Gowen Fld
$333
Alaska Airlines
Sep 15
BOI7:00 amBoise Air Term. Gowen Fld
9h 10m
2 stops
STL5:10 pmLambert-St Louis
Sep 19
STL6:08 pmLambert-St Louis
16h 48m
2 stops
BOI9:56 amBoise Air Term. Gowen Fld
$384

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 August 2, 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 9/10

2:50 pm-11:17 am

1 stop19h 27m

Lambert-St Louis

Wed 9/16

12:17 pm-1:55 pm

1 stop26h 38m

$260

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 9/11

2:50 pm-11:32 am

1 stop19h 42m

Lambert-St Louis

Wed 9/16

12:17 pm-1:55 pm

1 stop26h 38m

$281

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 10/5

2:50 pm-11:32 am

1 stop19h 42m

Lambert-St Louis

Wed 10/7

12:17 pm-2:57 pm

1 stop27h 40m

$291

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 11/10

10:37 am-11:23 pm

2 stops11h 46m

Lambert-St Louis

Thu 11/19

7:10 am-6:37 pm

2 stops12h 27m

$323

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 11/8

6:45 am-5:44 pm

2 stops9h 59m

Lambert-St Louis

Wed 11/18

2:20 pm-10:26 pm

2 stops9h 06m

$364
Quickest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 11/10

1:10 pm-6:35 pm

1 stop4h 25m

Lambert-St Louis

Thu 11/19

6:35 am-11:00 am

1 stop5h 25m

$369

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 11/9

3:55 pm-10:25 pm

1 stop5h 30m

Lambert-St Louis

Thu 11/19

6:00 am-12:00 pm

1 stop7h 00m

$369

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 9/10

2:41 pm-11:31 pm

1 stop7h 50m

Lambert-St Louis

Tue 9/15

4:40 pm-9:45 pm

1 stop6h 05m

$369

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 9/12

2:50 pm-11:16 pm

1 stop7h 26m

Lambert-St Louis

Mon 9/28

5:47 pm-11:59 pm

1 stop7h 12m

$369

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 10/5

5:30 pm-11:44 pm

1 stop5h 14m

Lambert-St Louis

Wed 10/7

5:10 am-1:03 pm

2 stops8h 53m

$425

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

Prices are currently low for flights on this route.

Typical prices usually range from $414 to $676.
The lowest price recently found on this route was $260.

What is the cheapest month to fly to St. Louis?

In general, February 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 $0. The month of October is another great option to travel to St. Louis, with average flight prices from Boise averaging around $401.

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

5h 49m

Direct flights

None
The fastest flight from Boise to St. Louis takes 5h 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

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 5h 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 $260Free CancellationRating
7.8
8,494 reviews
Search Delta flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
10,062 reviews
Search United Airlines flights
SouthwestPriceFrom $347Free CancellationRating
8.0
4,229 reviews
Search Southwest flights

  • Southwest Flights From Boise to St. Louis

    Southwest flies from Boise to St. Louis around 2 times per week, with 4,229 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Boise to St. Louis in the last 72 hours was $347 (round-trip), much lower than the average airfare cost of $502 for Southwest flights on this route.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
St. Peters
Maryland Heights
Florissant
Collinsville
Alton
O'Fallon
Clayton
Farmington
Fenton
Wentzville
Festus
Eureka
Edwardsville
Litchfield
Grafton
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.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 9/1
Tue 9/8
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States