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Cheap flights from Boise to St. Louis from $148

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 2/28. 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

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Find the cheapest flights from Boise to St. Louis

Cheap round-trip flights

American Airlines Logo
6:44 am - 4:36 pmBOI-STL
8h 52m1 stop
American Airlines Logo
5:16 pm - 10:56 pmSTL-BOI
6h 40m1 stop
$287American Airlines
Find Deal
jue., dic. 11 - mar., dic. 23
Frontier Logo
12:22 pm - 9:06 amBOI-STL
19h 44m1 stop
Frontier Logo
7:52 pm - 11:43 amSTL-BOI
16h 51m1 stop
$302Frontier
Find Deal
dom., oct. 5 - mié., oct. 8
United Airlines Logo
2:39 pm - 8:46 pmBOI-STL
5h 07m1 stop
United Airlines Logo
5:29 pm - 11:28 pmSTL-BOI
6h 59m1 stop
$322United Airlines
Find Deal
vie., oct. 24 - lun., oct. 27
Delta Logo
1:55 pm - 11:39 pmBOI-STL
8h 44m1 stop
Delta Logo
3:35 pm - 10:32 pmSTL-BOI
7h 57m1 stop
$338Delta
Find Deal
jue., dic. 25 - mar., dic. 30
Delta Logo
7:45 pm - 8:51 amBOI-STL
12h 06m2 stops
Delta Logo
8:53 am - 2:02 pmSTL-BOI
6h 09m1 stop
$341Delta
Find Deal
vie., oct. 24 - lun., oct. 27
Alaska Airlines Logo
6:28 am - 3:18 pmBOI-STL
7h 50m1 stop
Alaska Airlines Logo
4:15 pm - 9:02 pmSTL-BOI
29h 47m1 stop
$394Alaska Airlines
Find Deal
jue., nov. 20 - dom., nov. 23
Southwest Logo
7:00 am - 7:20 pmBOI-STL
11h 20m2 stops
Southwest Logo
4:40 pm - 12:40 amSTL-BOI
9h 00m2 stops
$398Southwest
Find Deal
vie., oct. 24 - lun., oct. 27
United Airlines Logo
5:00 am - 3:44 pmBOI-STL
9h 44m2 stops
United Airlines Logo
5:15 am - 9:53 amSTL-BOI
5h 38m1 stop
$407United Airlines
Find Deal
dom., oct. 5 - mié., oct. 8
Alaska Airlines Logo
8:00 am - 12:03 amBOI-STL
15h 03m1 stop
Alaska Airlines Logo
3:57 pm - 11:05 pmSTL-BOI
8h 08m1 stop
$432Alaska Airlines
Find Deal
dom., oct. 5 - mié., oct. 8
Southwest Logo
6:10 am - 5:20 pmBOI-STL
10h 10m2 stops
Southwest Logo
3:45 pm - 12:40 amSTL-BOI
9h 55m2 stops
$442Southwest
Find Deal
jue., dic. 25 - mar., dic. 30

American Airlines flights from Boise to St. Louis

Our best American Airlines deals on Boise to St. Louis flight tickets
American Airlines
Dec 11
BOI6:44 amBoise Air Term. Gowen Fld
8h 52m
1 stop
STL4:36 pmLambert-St Louis
Dec 23
STL5:16 pmLambert-St Louis
6h 40m
1 stop
BOI10:56 pmBoise Air Term. Gowen Fld
$287
Find similar
American Airlines
Nov 20
BOI1:25 pmBoise Air Term. Gowen Fld
8h 09m
1 stop
STL10:34 pmLambert-St Louis
Nov 23
STL7:00 amLambert-St Louis
7h 46m
1 stop
BOI1:46 pmBoise Air Term. Gowen Fld
$418
Find similar
American Airlines
Sep 25
BOI1:57 pmBoise Air Term. Gowen Fld
9h 02m
1 stop
STL11:59 pmLambert-St Louis
Sep 28
STL7:23 amLambert-St Louis
6h 04m
1 stop
BOI12:27 pmBoise Air Term. Gowen Fld
$697
Find similar

Delta flights from Boise to St. Louis

Our best Delta deals on Boise to St. Louis flight tickets
Delta
Dec 25
BOI1:55 pmBoise Air Term. Gowen Fld
8h 44m
1 stop
STL11:39 pmLambert-St Louis
Dec 30
STL3:35 pmLambert-St Louis
7h 57m
1 stop
BOI10:32 pmBoise Air Term. Gowen Fld
$338
Find similar
Delta
Oct 24
BOI7:45 pmBoise Air Term. Gowen Fld
12h 06m
2 stops
STL8:51 amLambert-St Louis
Oct 27
STL8:53 amLambert-St Louis
6h 09m
1 stop
BOI2:02 pmBoise Air Term. Gowen Fld
$341
Find similar
Delta
Oct 24
BOI7:45 pmBoise Air Term. Gowen Fld
12h 06m
2 stops
STL8:51 amLambert-St Louis
Oct 27
STL3:30 pmLambert-St Louis
9h 38m
2 stops
BOI12:08 amBoise Air Term. Gowen Fld
$346
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 septiembre 17, 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

jue. 12/11

6:44 am-4:36 pm

1 stop8h 52m

Lambert-St Louis

mar. 12/23

5:16 pm-10:56 pm

1 stop6h 40m

$287

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

dom. 10/5

12:22 pm-9:06 am

1 stop19h 44m

Lambert-St Louis

mié. 10/8

7:52 pm-11:43 am

1 stop16h 51m

$302

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

vie. 10/24

2:39 pm-8:46 pm

1 stop5h 07m

Lambert-St Louis

lun. 10/27

5:29 pm-11:28 pm

1 stop6h 59m

$322

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 12/25

1:55 pm-11:39 pm

1 stop8h 44m

Lambert-St Louis

mar. 12/30

3:35 pm-10:32 pm

1 stop7h 57m

$338

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

vie. 10/24

7:45 pm-8:51 am

2 stops12h 06m

Lambert-St Louis

lun. 10/27

8:53 am-2:02 pm

1 stop6h 09m

$341

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 11/20

6:28 am-3:18 pm

1 stop7h 50m

Lambert-St Louis

dom. 11/23

4:15 pm-9:02 pm

1 stop29h 47m

$394

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

vie. 10/24

7:00 am-7:20 pm

2 stops11h 20m

Lambert-St Louis

lun. 10/27

4:40 pm-12:40 am

2 stops9h 00m

$398

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

dom. 10/5

5:00 am-3:44 pm

2 stops9h 44m

Lambert-St Louis

mié. 10/8

5:15 am-9:53 am

1 stop5h 38m

$407

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

dom. 10/5

8:00 am-12:03 am

1 stop15h 03m

Lambert-St Louis

mié. 10/8

3:57 pm-11:05 pm

1 stop8h 08m

$432

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 12/25

6:10 am-5:20 pm

2 stops10h 10m

Lambert-St Louis

mar. 12/30

3:45 pm-12:40 am

2 stops9h 55m

$442

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, April 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 $334. The month of December is another great option to travel to St. Louis, with average flight prices from Boise averaging around $345.

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 $438 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 September 2025, prices for Boise to St. Louis flights are approximately 30% 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 07m.

  • 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
7,961 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $286Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
8,926 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
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
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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