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Cheap flights from Boise to St. Louis from $100

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 3/8. 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
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
1:45 pm - 11:25 pm
BOI
-
STL
8h 40m
2 stops
Delta Logo
3:05 pm - 9:09 pm
STL
-
BOI
7h 04m
1 stop
$295Delta
sáb., mar. 28 - mar., mar. 31
Delta Logo
5:34 am - 11:32 am
BOI
-
STL
4h 58m
1 stop
Delta Logo
2:20 pm - 10:24 pm
STL
-
BOI
9h 04m
2 stops
$301Delta
mar., abr. 28 - jue., abr. 30
United Airlines Logo
5:31 pm - 11:34 pm
BOI
-
STL
5h 03m
1 stop
United Airlines Logo
8:30 am - 4:48 pm
STL
-
BOI
9h 18m
1 stop
$309United Airlines
sáb., mar. 28 - mar., mar. 31
Multiple Airlines Logo
12:38 pm - 9:49 am
BOI
-
STL
20h 11m
1 stop
Multiple Airlines Logo
10:47 pm - 4:47 pm
STL
-
BOI
19h 00m
1 stop
$314Multiple Airlines
jue., mar. 5 - dom., mar. 8
Delta Logo
5:40 am - 5:26 pm
BOI
-
STL
10h 46m
2 stops
Delta Logo
2:20 pm - 10:24 pm
STL
-
BOI
9h 04m
2 stops
$325Delta
mar., abr. 28 - jue., abr. 30
American Airlines Logo
1:29 pm - 10:17 pm
BOI
-
STL
7h 48m
1 stop
American Airlines Logo
7:05 am - 12:49 pm
STL
-
BOI
6h 44m
1 stop
$327American Airlines
mié., abr. 22 - lun., abr. 27
Delta Logo
1:45 pm - 11:25 pm
BOI
-
STL
8h 40m
2 stops
Delta Logo
7:15 am - 6:43 pm
STL
-
BOI
12h 28m
2 stops
$335Delta
sáb., mar. 28 - mar., mar. 31
Delta Logo
6:15 pm - 12:21 am
BOI
-
STL
5h 06m
1 stop
Delta Logo
3:05 pm - 9:09 pm
STL
-
BOI
7h 04m
1 stop
$344Delta
vie., mar. 27 - mar., mar. 31
Southwest Logo
6:00 am - 1:30 pm
BOI
-
STL
6h 30m
1 stop
Southwest Logo
5:15 pm - 12:45 am
STL
-
BOI
8h 30m
2 stops
$363Southwest
mié., abr. 22 - lun., abr. 27
Alaska Airlines Logo
4:15 pm - 11:59 pm
BOI
-
STL
6h 44m
1 stop
Alaska Airlines Logo
5:30 pm - 11:56 pm
STL
-
BOI
7h 26m
1 stop
$366Alaska Airlines
mié., mar. 25 - sáb., mar. 28

Alaska Airlines flights from Boise to St. Louis

Our best Alaska Airlines deals on Boise to St. Louis flight tickets
Alaska Airlines
Mar 25
BOI4:15 pmBoise Air Term. Gowen Fld
6h 44m
1 stop
STL11:59 pmLambert-St Louis
Mar 28
STL5:30 pmLambert-St Louis
7h 26m
1 stop
BOI11:56 pmBoise Air Term. Gowen Fld
$366
Alaska Airlines
Mar 25
BOI4:15 pmBoise Air Term. Gowen Fld
6h 44m
1 stop
STL11:59 pmLambert-St Louis
Mar 28
STL5:30 pmLambert-St Louis
7h 26m
1 stop
BOI11:56 pmBoise Air Term. Gowen Fld
$369
Alaska Airlines
Mar 25
BOI9:55 amBoise Air Term. Gowen Fld
13h 04m
1 stop
STL11:59 pmLambert-St Louis
Mar 28
STL5:30 pmLambert-St Louis
7h 26m
1 stop
BOI11:56 pmBoise Air Term. Gowen Fld
$373

United Airlines flights from Boise to St. Louis

Our best United Airlines deals on Boise to St. Louis flight tickets
United Airlines
Mar 28
BOI5:31 pmBoise Air Term. Gowen Fld
5h 03m
1 stop
STL11:34 pmLambert-St Louis
Mar 31
STL8:30 amLambert-St Louis
9h 18m
1 stop
BOI4:48 pmBoise Air Term. Gowen Fld
$309
United Airlines
Mar 25
BOI2:40 pmBoise Air Term. Gowen Fld
7h 54m
1 stop
STL11:34 pmLambert-St Louis
Mar 29
STL5:15 amLambert-St Louis
5h 39m
1 stop
BOI9:54 amBoise Air Term. Gowen Fld
$383
United Airlines
Mar 18
BOI7:47 amBoise Air Term. Gowen Fld
7h 36m
1 stop
STL4:23 pmLambert-St Louis
Mar 25
STL2:50 pmLambert-St Louis
7h 39m
1 stop
BOI9:29 pmBoise Air Term. Gowen Fld
$402

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 febrero 20, 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

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

sáb. 3/28

1:45 pm-11:25 pm

2 stops8h 40m

Lambert-St Louis

mar. 3/31

3:05 pm-9:09 pm

1 stop7h 04m

$295

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mar. 4/28

5:34 am-11:32 am

1 stop4h 58m

Lambert-St Louis

jue. 4/30

2:20 pm-10:24 pm

2 stops9h 04m

$301

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

sáb. 3/28

5:31 pm-11:34 pm

1 stop5h 03m

Lambert-St Louis

mar. 3/31

8:30 am-4:48 pm

1 stop9h 18m

$309

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 3/5

12:38 pm-9:49 am

1 stop20h 11m

Lambert-St Louis

dom. 3/8

10:47 pm-4:47 pm

1 stop19h 00m

$314

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mar. 4/28

5:40 am-5:26 pm

2 stops10h 46m

Lambert-St Louis

jue. 4/30

2:20 pm-10:24 pm

2 stops9h 04m

$325

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mié. 4/22

1:29 pm-10:17 pm

1 stop7h 48m

Lambert-St Louis

lun. 4/27

7:05 am-12:49 pm

1 stop6h 44m

$327

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

sáb. 3/28

1:45 pm-11:25 pm

2 stops8h 40m

Lambert-St Louis

mar. 3/31

7:15 am-6:43 pm

2 stops12h 28m

$335

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

vie. 3/27

6:15 pm-12:21 am

1 stop5h 06m

Lambert-St Louis

mar. 3/31

3:05 pm-9:09 pm

1 stop7h 04m

$344

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mié. 4/22

6:00 am-1:30 pm

1 stop6h 30m

Lambert-St Louis

lun. 4/27

5:15 pm-12:45 am

2 stops8h 30m

$363

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mié. 3/25

4:15 pm-11:59 pm

1 stop6h 44m

Lambert-St Louis

sáb. 3/28

5:30 pm-11:56 pm

1 stop7h 26m

$366

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 $299.

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 $400 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 $290 on momondo.

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

4h 50m

Direct flights

None
The fastest flight from Boise to St. Louis takes 4h 50m
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 4h 50m.

  • 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 $143Free CancellationRating
7.9
8,215 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,320 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
11,907 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,295 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,325 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
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Wentzville
Fenton
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
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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