Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Boise 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 St. Louis to Boise departing on 4/8. 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.

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

Find the cheapest flights from St. Louis to Boise

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:16 pm - 11:08 am
STL
-
BOI
15h 52m
1 stop
Frontier Logo
12:03 pm - 9:48 am
BOI
-
STL
20h 45m
1 stop
$237Frontier
Wed, Apr 1 - Sun, Apr 5
Frontier Logo
8:16 pm - 11:08 am
STL
-
BOI
15h 52m
1 stop
Frontier Logo
12:03 pm - 9:48 am
BOI
-
STL
20h 45m
1 stop
$270Frontier
Wed, Apr 1 - Sun, Apr 5
Alaska Airlines Logo
7:00 am - 1:58 pm
STL
-
BOI
7h 58m
1 stop
Alaska Airlines Logo
2:22 pm - 11:59 pm
BOI
-
STL
8h 37m
1 stop
$277Alaska Airlines
Tue, Apr 7 - Wed, Apr 8
Frontier Logo
8:08 pm - 12:30 pm
STL
-
BOI
17h 22m
1 stop
Frontier Logo
1:25 pm - 7:23 pm
BOI
-
STL
28h 58m
1 stop
$311Frontier
Sat, May 23 - Tue, May 26
Alaska Airlines Logo
7:00 am - 1:58 pm
STL
-
BOI
7h 58m
1 stop
Alaska Airlines Logo
2:22 pm - 11:59 pm
BOI
-
STL
8h 37m
1 stop
$337Alaska Airlines
Tue, Apr 7 - Wed, Apr 8
Frontier Logo
8:16 pm - 11:08 am
STL
-
BOI
15h 52m
1 stop
Frontier Logo
12:03 pm - 9:48 am
BOI
-
STL
20h 45m
1 stop
$347Frontier
Wed, Apr 1 - Sun, Apr 5
American Airlines Logo
7:05 am - 12:49 pm
STL
-
BOI
6h 44m
1 stop
American Airlines Logo
1:53 pm - 10:59 pm
BOI
-
STL
8h 06m
1 stop
$352American Airlines
Thu, Apr 9 - Sat, Apr 11
Frontier Logo
8:08 pm - 12:30 pm
STL
-
BOI
17h 22m
1 stop
Frontier Logo
1:25 pm - 8:55 am
BOI
-
STL
18h 30m
2 stops
$356Frontier
Sat, May 23 - Tue, May 26
Multiple Airlines Logo
7:00 am - 1:58 pm
STL
-
BOI
7h 58m
1 stop
Multiple Airlines Logo
11:53 am - 7:21 pm
BOI
-
STL
6h 28m
1 stop
$361Multiple Airlines
Thu, Apr 16 - Sun, Apr 19
Frontier Logo
8:08 pm - 12:30 pm
STL
-
BOI
17h 22m
1 stop
Frontier Logo
1:25 pm - 8:26 pm
BOI
-
STL
30h 01m
2 stops
$365Frontier
Wed, May 27 - Sun, May 31

Alaska Airlines flights from St. Louis to Boise

Our best Alaska Airlines deals on St. Louis to Boise flight tickets
Alaska Airlines
Apr 7
STL7:00 amLambert-St Louis
7h 58m
1 stop
BOI1:58 pmBoise Air Term. Gowen Fld
Apr 8
BOI2:22 pmBoise Air Term. Gowen Fld
8h 37m
1 stop
STL11:59 pmLambert-St Louis
$277
Alaska Airlines
Apr 7
STL7:00 amLambert-St Louis
7h 58m
1 stop
BOI1:58 pmBoise Air Term. Gowen Fld
Apr 8
BOI2:22 pmBoise Air Term. Gowen Fld
8h 37m
1 stop
STL11:59 pmLambert-St Louis
$337
Alaska Airlines
May 5
STL7:00 amLambert-St Louis
7h 52m
1 stop
BOI1:52 pmBoise Air Term. Gowen Fld
May 12
BOI2:57 pmBoise Air Term. Gowen Fld
8h 02m
1 stop
STL11:59 pmLambert-St Louis
$393

Southwest flights from St. Louis to Boise

Our best Southwest deals on St. Louis to Boise flight tickets
Southwest
Apr 21
STL5:45 amLambert-St Louis
8h 35m
2 stops
BOI1:20 pmBoise Air Term. Gowen Fld
Apr 27
BOI4:20 pmBoise Air Term. Gowen Fld
6h 30m
1 stop
STL11:50 pmLambert-St Louis
$366
Southwest
Apr 22
STL8:35 amLambert-St Louis
7h 50m
1 stop
BOI3:25 pmBoise Air Term. Gowen Fld
Apr 26
BOI4:10 pmBoise Air Term. Gowen Fld
6h 35m
1 stop
STL11:45 pmLambert-St Louis
$372
Southwest
Apr 22
STL5:45 amLambert-St Louis
8h 35m
2 stops
BOI1:20 pmBoise Air Term. Gowen Fld
Apr 26
BOI4:10 pmBoise Air Term. Gowen Fld
5h 10m
1 stop
STL10:20 pmLambert-St Louis
$377

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Boise 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 21, 2026.
Use the filters below to find and compare flights from St. Louis to Boise that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 4/1

8:16 pm-11:08 am

1 stop15h 52m

Boise Air Term. Gowen Fld

Sun 4/5

12:03 pm-9:48 am

1 stop20h 45m

$237

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 4/1

8:16 pm-11:08 am

1 stop15h 52m

Boise Air Term. Gowen Fld

Sun 4/5

12:03 pm-9:48 am

1 stop20h 45m

$270

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 4/7

7:00 am-1:58 pm

1 stop7h 58m

Boise Air Term. Gowen Fld

Wed 4/8

2:22 pm-11:59 pm

1 stop8h 37m

$277

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 5/23

8:08 pm-12:30 pm

1 stop17h 22m

Boise Air Term. Gowen Fld

Tue 5/26

1:25 pm-7:23 pm

1 stop28h 58m

$311

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 4/7

7:00 am-1:58 pm

1 stop7h 58m

Boise Air Term. Gowen Fld

Wed 4/8

2:22 pm-11:59 pm

1 stop8h 37m

$337

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 4/1

8:16 pm-11:08 am

1 stop15h 52m

Boise Air Term. Gowen Fld

Sun 4/5

12:03 pm-9:48 am

1 stop20h 45m

$347

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 4/9

7:05 am-12:49 pm

1 stop6h 44m

Boise Air Term. Gowen Fld

Sat 4/11

1:53 pm-10:59 pm

1 stop8h 06m

$352

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 5/23

8:08 pm-12:30 pm

1 stop17h 22m

Boise Air Term. Gowen Fld

Tue 5/26

1:25 pm-8:55 am

2 stops18h 30m

$356
Quickest round-trip

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 4/16

7:00 am-1:58 pm

1 stop7h 58m

Boise Air Term. Gowen Fld

Sun 4/19

11:53 am-7:21 pm

1 stop6h 28m

$361

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 5/27

8:08 pm-12:30 pm

1 stop17h 22m

Boise Air Term. Gowen Fld

Sun 5/31

1:25 pm-8:26 pm

2 stops30h 01m

$365

Flights are sorted by cheapest round-trip flights first.

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

See travel insights to Boise from

How to get the cheapest flight ticket from St. Louis to Boise

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 Boise?

The month of January is, on average, the cheapest month to fly to Boise from St. Louis, with most prices found around $359. If you aren’t able to travel during the month of January, then book flights to Boise from St. Louis during November instead. Flights to Boise in November, while not as cheap as those in January, still average around $373.

How far in advance should I book a flight to Boise?

You are more likely to see cheaper flights to Boise from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Boise for around $436 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boise from St. Louis for as low as $292 on momondo.

How have St. Louis to Boise flight prices changed over time?

As of March 2026, prices for St. Louis to Boise flights are approximately 12% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Boise

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Boise according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Boise (STL to BOI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Boise

Fastest flight time

5h 25m

Direct flights

None
The fastest flight from St. Louis to Boise takes 5h 25m
There are no direct flights from St. Louis to Boise. There are no popular flight routes from St. Louis to Boise.
Search flight deals

  • How far is Lambert-St Louis to Boise Air Term. Gowen Fld by plane?

    Lambert-St Louis and Boise Air Term. Gowen Fld are 1389.5 mi apart from one another. By plane, this route typically takes 5h 25m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport?

    Prices for flights from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport.

  • What documentation or ID do you need to fly to Boise Air Term. Gowen Fld Airport?

    The travel and health documents required for your trip to Boise Air Term. Gowen Fld Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Boise Air Term. Gowen Fld Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Boise?

Best airlines flying from St. Louis to Boise

Compare and see reviews for airlines that fly from St. Louis to Boise with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $186Free CancellationRating
7.1
11,489 reviews
Search American Airlines flights
DeltaPriceFrom $237Free CancellationRating
7.9
8,314 reviews
Search Delta flights
SouthwestPriceFrom $296Free CancellationRating
8.0
4,324 reviews
Search Southwest flights
United AirlinesPriceFrom $338Free CancellationRating
7.4
9,455 reviews
Search United Airlines flights

Traveling to a place near Boise?

Book flights to Boise if you plan to visit one of these locations
Nampa
Meridian
McCall
Caldwell
Ontario
Eagle

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Boise?

It is quick and easy to find St. Louis to Boise flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Boise that suits you.

Can I find flights from St. Louis to Boise with flexible booking policies on momondo?

Flights from St. Louis to Boise with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Boise?

momondo provides multiple filters to help you find the best flight to Boise from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from St. Louis to Boise right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Boise flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Boise 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
Mon 4/20
Mon 4/27
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States