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Cheap flights from Boise to St. Louis from $85

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 2/12. 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
1:54 pm - 12:50 amBOI-STL
9h 56m2 stops
Delta Logo
6:00 am - 4:02 pmSTL-BOI
11h 02m2 stops
$256Delta
Find Deal
Sat, Dec 13 - Wed, Dec 17
Delta Logo
1:00 pm - 9:35 pmBOI-STL
7h 35m1 stop
Delta Logo
6:00 am - 12:30 pmSTL-BOI
7h 30m1 stop
$281Delta
Find Deal
Sat, Jan 17 - Wed, Jan 21
Delta Logo
5:40 am - 9:35 pmBOI-STL
14h 55m2 stops
Delta Logo
6:10 am - 1:34 pmSTL-BOI
8h 24m1 stop
$284Delta
Find Deal
Sat, Jan 17 - Wed, Jan 21
Delta Logo
3:13 pm - 11:27 pmBOI-STL
7h 14m1 stop
Delta Logo
6:15 am - 6:51 pmSTL-BOI
13h 36m2 stops
$288Delta
Find Deal
Sat, Dec 13 - Wed, Dec 17
Delta Logo
2:04 pm - 9:57 pmBOI-STL
6h 53m1 stop
Delta Logo
6:00 am - 4:02 pmSTL-BOI
11h 02m2 stops
$296Delta
Find Deal
Sat, Dec 13 - Wed, Dec 17
Delta Logo
3:13 pm - 11:27 pmBOI-STL
7h 14m1 stop
Delta Logo
8:05 pm - 12:42 amSTL-BOI
5h 37m1 stop
$297Delta
Find Deal
Sat, Dec 13 - Wed, Dec 17
Delta Logo
10:39 am - 9:35 pmBOI-STL
9h 56m2 stops
Delta Logo
6:40 am - 4:17 pmSTL-BOI
10h 37m2 stops
$306Delta
Find Deal
Sat, Jan 17 - Wed, Jan 21
Delta Logo
8:50 am - 12:24 amBOI-STL
14h 34m2 stops
Delta Logo
6:10 am - 1:36 pmSTL-BOI
8h 26m1 stop
$313Delta
Find Deal
Mon, Mar 2 - Sat, Mar 7
Alaska Airlines Logo
6:28 am - 1:51 pmBOI-STL
6h 23m1 stop
Alaska Airlines Logo
2:47 pm - 9:15 pmSTL-BOI
7h 28m1 stop
$317Alaska Airlines
Find Deal
Tue, Mar 3 - Sat, Mar 7
Delta Logo
5:20 am - 2:58 pmBOI-STL
8h 38m1 stop
Delta Logo
6:10 am - 1:36 pmSTL-BOI
8h 26m1 stop
$318Delta
Find Deal
Wed, Mar 4 - Sat, Mar 7

Delta flights from Boise to St. Louis

Our best Delta deals on Boise to St. Louis flight tickets
Delta
Dec 13
BOI1:54 pmBoise Air Term. Gowen Fld
9h 56m
2 stops
STL12:50 amLambert-St Louis
Dec 17
STL6:00 amLambert-St Louis
11h 02m
2 stops
BOI4:02 pmBoise Air Term. Gowen Fld
$256
Find similar
Delta
Jan 17
BOI1:00 pmBoise Air Term. Gowen Fld
7h 35m
1 stop
STL9:35 pmLambert-St Louis
Jan 21
STL3:31 pmLambert-St Louis
6h 24m
1 stop
BOI8:55 pmBoise Air Term. Gowen Fld
$281
Find similar
Delta
Jan 17
BOI5:40 amBoise Air Term. Gowen Fld
14h 55m
2 stops
STL9:35 pmLambert-St Louis
Jan 21
STL6:10 amLambert-St Louis
8h 24m
1 stop
BOI1:34 pmBoise Air Term. Gowen Fld
$284
Find similar

United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Apr 26
BOI6:55 pmBoise Air Term. Gowen Fld
9h 57m
1 stop
STL5:52 amLambert-St Louis
May 1
STL1:30 pmLambert-St Louis
5h 25m
1 stop
BOI5:55 pmBoise Air Term. Gowen Fld
$427
Find similar
United Airlines
Apr 26
BOI6:55 pmBoise Air Term. Gowen Fld
9h 57m
1 stop
STL5:52 amLambert-St Louis
May 1
STL5:20 amLambert-St Louis
9h 10m
2 stops
BOI1:30 pmBoise Air Term. Gowen Fld
$432
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 20, 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

Sat 12/13

1:54 pm-12:50 am

2 stops9h 56m

Lambert-St Louis

Wed 12/17

6:00 am-4:02 pm

2 stops11h 02m

$256

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 1/17

1:00 pm-9:35 pm

1 stop7h 35m

Lambert-St Louis

Wed 1/21

6:00 am-12:30 pm

1 stop7h 30m

$281

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 1/17

5:40 am-9:35 pm

2 stops14h 55m

Lambert-St Louis

Wed 1/21

6:10 am-1:34 pm

1 stop8h 24m

$284

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 12/13

3:13 pm-11:27 pm

1 stop7h 14m

Lambert-St Louis

Wed 12/17

6:15 am-6:51 pm

2 stops13h 36m

$288

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 12/13

2:04 pm-9:57 pm

1 stop6h 53m

Lambert-St Louis

Wed 12/17

6:00 am-4:02 pm

2 stops11h 02m

$296

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 12/13

3:13 pm-11:27 pm

1 stop7h 14m

Lambert-St Louis

Wed 12/17

8:05 pm-12:42 am

1 stop5h 37m

$297

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 1/17

10:39 am-9:35 pm

2 stops9h 56m

Lambert-St Louis

Wed 1/21

6:40 am-4:17 pm

2 stops10h 37m

$306

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 3/2

8:50 am-12:24 am

2 stops14h 34m

Lambert-St Louis

Sat 3/7

6:10 am-1:36 pm

1 stop8h 26m

$313

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 3/3

6:28 am-1:51 pm

1 stop6h 23m

Lambert-St Louis

Sat 3/7

2:47 pm-9:15 pm

1 stop7h 28m

$317

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 3/4

5:20 am-2:58 pm

1 stop8h 38m

Lambert-St Louis

Sat 3/7

6:10 am-1:36 pm

1 stop8h 26m

$318

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 $431 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 $286 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.
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 5h 29m.

  • 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
8,002 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,326 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $286Free CancellationRating
8.0
4,251 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,028 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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