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Cheap flights from Montana to St. Louis from $131

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montana to St. Louis departing on 8/24. 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 Montana to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:00 pm - 12:44 am
FCA
-
STL
5h 44m
1 stop
Delta Logo
3:52 pm - 8:18 pm
STL
-
FCA
5h 26m
1 stop
$309Delta
Tue, Sep 22 - Sat, Sep 26
Delta Logo
6:00 pm - 12:44 am
FCA
-
STL
5h 44m
1 stop
Delta Logo
12:00 pm - 10:54 pm
STL
-
FCA
11h 54m
2 stops
$314Delta
Tue, Sep 22 - Fri, Sep 25
Multiple Airlines Logo
8:46 pm - 11:51 am
FCA
-
STL
14h 05m
1 stop
Multiple Airlines Logo
10:35 am - 7:43 pm
STL
-
FCA
34h 08m
2 stops
$324Multiple Airlines
Mon, Sep 21 - Thu, Sep 24
Delta Logo
12:55 pm - 6:55 pm
HLN
-
STL
5h 00m
1 stop
Delta Logo
8:00 am - 12:15 pm
STL
-
HLN
5h 15m
1 stop
$329Delta
Thu, Aug 13 - Sun, Aug 16
Multiple Airlines Logo
8:46 pm - 11:51 am
FCA
-
STL
14h 05m
1 stop
Multiple Airlines Logo
10:35 am - 7:43 pm
STL
-
FCA
34h 08m
2 stops
$330Multiple Airlines
Mon, Sep 21 - Thu, Sep 24
Southwest Logo
6:55 am - 3:05 pm
BZN
-
STL
7h 10m
1 stop
Southwest Logo
5:30 pm - 10:25 pm
STL
-
BZN
5h 55m
1 stop
$339Southwest
Wed, Aug 12 - Thu, Aug 20
American Airlines Logo
3:26 pm - 11:43 pm
FCA
-
STL
7h 17m
1 stop
American Airlines Logo
5:00 am - 2:33 pm
STL
-
FCA
10h 33m
2 stops
$349American Airlines
Tue, Sep 22 - Fri, Sep 25
United Airlines Logo
2:35 pm - 8:38 pm
HLN
-
STL
5h 03m
1 stop
United Airlines Logo
4:39 pm - 9:18 pm
STL
-
HLN
5h 39m
1 stop
$357United Airlines
Fri, Sep 18 - Mon, Sep 28
United Airlines Logo
2:35 pm - 11:31 pm
HLN
-
STL
7h 56m
1 stop
United Airlines Logo
4:40 pm - 9:30 pm
STL
-
HLN
5h 50m
1 stop
$362United Airlines
Thu, Aug 13 - Sun, Aug 16
Southwest Logo
5:05 pm - 12:35 am
BZN
-
STL
6h 30m
1 stop
Southwest Logo
9:45 am - 1:35 pm
STL
-
BZN
4h 50m
1 stop
$391Southwest
Fri, Aug 14 - Sun, Aug 30

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Southwest flights from Montana to St. Louis

Our best Southwest deals on Montana to St. Louis flight tickets
Southwest
Aug 12
BZN6:55 amBozeman Gallatin Field
7h 10m
1 stop
STL3:05 pmLambert-St Louis
Aug 20
STL5:30 pmLambert-St Louis
5h 55m
1 stop
BZN10:25 pmBozeman Gallatin Field
$339
Southwest
Aug 14
BZN5:05 pmBozeman Gallatin Field
6h 30m
1 stop
STL12:35 amLambert-St Louis
Aug 30
STL9:45 amLambert-St Louis
4h 50m
1 stop
BZN1:35 pmBozeman Gallatin Field
$391
Southwest
Aug 12
BZN6:55 amBozeman Gallatin Field
7h 10m
1 stop
STL3:05 pmLambert-St Louis
Aug 20
STL3:45 pmLambert-St Louis
7h 40m
2 stops
BZN10:25 pmBozeman Gallatin Field
$394

Delta flights from Montana to St. Louis

Our best Delta deals on Montana to St. Louis flight tickets
Delta
Sep 22
FCA6:00 pmKalispell Glacier Park
5h 44m
1 stop
STL12:44 amLambert-St Louis
Sep 26
STL3:52 pmLambert-St Louis
5h 26m
1 stop
FCA8:18 pmKalispell Glacier Park
$309
Delta
Sep 22
FCA6:00 pmKalispell Glacier Park
5h 44m
1 stop
STL12:44 amLambert-St Louis
Sep 25
STL12:00 pmLambert-St Louis
11h 54m
2 stops
FCA10:54 pmKalispell Glacier Park
$314
Delta
Aug 13
HLN12:55 pmHelena
5h 00m
1 stop
STL6:55 pmLambert-St Louis
Aug 16
STL8:00 amLambert-St Louis
5h 15m
1 stop
HLN12:15 pmHelena
$329

momondo Fare Finder

 
Customize your flight search to find flights from Montana 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 July 2, 2026.
Use the filters below to find and compare flights from Montana to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Tue 9/22

6:00 pm-12:44 am

1 stop5h 44m

Lambert-St Louis

Sat 9/26

3:52 pm-8:18 pm

1 stop5h 26m

$309

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Tue 9/22

6:00 pm-12:44 am

1 stop5h 44m

Lambert-St Louis

Fri 9/25

12:00 pm-10:54 pm

2 stops11h 54m

$314

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Mon 9/21

8:46 pm-11:51 am

1 stop14h 05m

Lambert-St Louis

Thu 9/24

10:35 am-7:43 pm

2 stops34h 08m

$324
Quickest round-trip

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 8/13

12:55 pm-6:55 pm

1 stop5h 00m

Lambert-St Louis

Sun 8/16

8:00 am-12:15 pm

1 stop5h 15m

$329

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Mon 9/21

8:46 pm-11:51 am

1 stop14h 05m

Lambert-St Louis

Thu 9/24

10:35 am-7:43 pm

2 stops34h 08m

$330

BozemanSt. Louis

BZN - STL

BZNSTL

Bozeman Gallatin Field

Wed 8/12

6:55 am-3:05 pm

1 stop7h 10m

Lambert-St Louis

Thu 8/20

5:30 pm-10:25 pm

1 stop5h 55m

$339

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Tue 9/22

3:26 pm-11:43 pm

1 stop7h 17m

Lambert-St Louis

Fri 9/25

5:00 am-2:33 pm

2 stops10h 33m

$349

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Fri 9/18

2:35 pm-8:38 pm

1 stop5h 03m

Lambert-St Louis

Mon 9/28

4:39 pm-9:18 pm

1 stop5h 39m

$357

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 8/13

2:35 pm-11:31 pm

1 stop7h 56m

Lambert-St Louis

Sun 8/16

4:40 pm-9:30 pm

1 stop5h 50m

$362

BozemanSt. Louis

BZN - STL

BZNSTL

Bozeman Gallatin Field

Fri 8/14

5:05 pm-12:35 am

1 stop6h 30m

Lambert-St Louis

Sun 8/30

9:45 am-1:35 pm

1 stop4h 50m

$391

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 Montana 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, December is the cheapest month to fly from Montana to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $128. The month of April is another great option to travel to St. Louis, with average flight prices from Montana averaging around $164.

Cheap Montana to St. Louis flight deals and tips

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

Fastest flight time

5h 00m

Direct flights

None
The fastest flight from Montana to St. Louis takes 5h 00m
There are no direct flights from Montana to St. Louis. There are no popular flight routes from Montana to St. Louis.
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Frequently asked questions about flying from Montana to St. Louis

  • When did momondo last update prices for flights from Montana to Lambert-St Louis Airport?

    Prices for flights from Montana to Lambert-St Louis Airport were last updated today.

  • How many operators does momondo search for flights from Montana to Lambert-St Louis Airport?

  • How old do you have to be to fly from Montana to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Montana to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Montana to St. Louis

Compare and see reviews for airlines that fly from Montana to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $164Free CancellationRating
7.8
8,452 reviews
Search Delta flights
SouthwestPriceFrom $210Free CancellationRating
7.9
4,249 reviews
Search Southwest flights
United AirlinesPriceFrom $264Free CancellationRating
7.4
9,926 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
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Alton
Fenton
Farmington
Wentzville
Clayton
Festus
Eureka
Litchfield
Edwardsville
Grafton
Shrewsbury

Why use momondo?

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

Finding the right flight to St. Louis from Montana is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Montana to St. Louis flights to just show those with flexible booking policies.

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

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

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

Yes. momondo can track prices for Montana to St. Louis 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.

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