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$149+ Cheap flights from Kalispell to St. Louis (FCA - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/12. Fares are subject to change and may not be available on all flights or dates of travel.
FCA — STL
Apr 11 — Apr 181
Sat 4/11
Sat 4/18
1 adult, Economy
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Cheap flight deals from Kalispell to St. Louis

Cheapest flights from Kalispell to St. Louis
Explore the most affordable flight options available from Kalispell to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 12, 2026.

This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/36:10 pm
FCA
-
STL
1 stop5h 15m
Delta
Wed 5/66:45 pm
STL
-
FCA
1 stop5h 42m
Delta
Deal found 3/8$277
This Delta deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/15:56 pm
FCA
-
STL
1 stop5h 25m
Delta
Fri 4/36:12 pm
STL
-
FCA
1 stop6h 29m
Delta
Deal found 3/10$297
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:09 am
FCA
-
STL
1 stop8h 34m
Delta
Thu 4/96:12 pm
STL
-
FCA
1 stop6h 29m
Delta
Deal found 3/11$308
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/231:20 pm
FCA
-
STL
2 stops9h 30m
United Airlines
Sun 9/275:20 am
STL
-
FCA
1 stop5h 48m
United Airlines
Deal found 3/9$322
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/42:33 pm
FCA
-
STL
1 stop5h 21m
United Airlines
Sat 4/112:40 pm
STL
-
FCA
1 stop8h 07m
United Airlines
Deal found 3/7$328
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/255:28 pm
FCA
-
STL
1 stop5h 29m
United Airlines
Wed 6/35:10 am
STL
-
FCA
1 stop5h 51m
United Airlines
Deal found 3/8$330
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/65:56 pm
FCA
-
STL
1 stop5h 25m
Delta
Mon 4/136:45 pm
STL
-
FCA
1 stop5h 42m
Delta
Deal found 3/9$334
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:00 am
FCA
-
STL
1 stop6h 08m
United Airlines
Sat 4/112:40 pm
STL
-
FCA
1 stop8h 07m
United Airlines
Deal found 3/7$353
This Delta deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/95:09 am
FCA
-
STL
1 stop7h 08m
Delta
Mon 4/136:45 pm
STL
-
FCA
1 stop5h 42m
Delta
Deal found 3/10$354
This United Airlines deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/12:33 pm
FCA
-
STL
1 stop5h 21m
United Airlines
Fri 4/39:10 am
STL
-
FCA
2 stops13h 17m
United Airlines
Deal found 3/10$356
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/292:23 pm
FCA
-
STL
1 stop8h 02m
Delta
Sat 4/46:29 am
STL
-
FCA
1 stop7h 59m
Delta
Deal found 3/11$368

Find flight deals from Kalispell to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Kalispell (FCA) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$277
(Delta)

One-way from

$149
(United Airlines)

Popular in

January

Cheapest in

November

Average price

$456
Provider with most accurate pricing for Kalispell Glacier Park-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Kalispell Glacier Park-Lambert-St Louis flights.
Search Deals
From Kalispell Glacier Park to Lambert-St Louis
Search Deals
One-way flight from Kalispell Glacier Park to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 33% potential increase in price ($248 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 14% potential price decrease ($61 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Kalispell 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, Cheapflights users made 2,558,603 searches. Data last updated March 12, 2026.
Use the filters below to find and compare flights from Kalispell 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

Sat 4/4

5:09 am-2:43 pm

1 stop8h 34m

Lambert-St Louis

Thu 4/9

6:12 pm-11:41 pm

1 stop6h 29m

$308
Quickest round-trip

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Mon 5/25

5:28 pm-11:57 pm

1 stop5h 29m

Lambert-St Louis

Wed 6/3

5:10 am-10:01 am

1 stop5h 51m

$330

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Sun 4/5

6:00 am-1:08 pm

1 stop6h 08m

Lambert-St Louis

Sat 4/11

2:40 pm-9:47 pm

1 stop8h 07m

$353

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Sun 3/29

2:23 pm-11:25 pm

1 stop8h 02m

Lambert-St Louis

Sat 4/4

6:29 am-1:28 pm

1 stop7h 59m

$368

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Tue 3/31

8:26 pm-11:59 pm

1 stop26h 33m

Lambert-St Louis

Sat 4/4

4:20 pm-11:47 pm

1 stop8h 27m

$390

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Tue 3/31

2:33 pm-8:54 pm

1 stop5h 21m

Lambert-St Louis

Sat 4/4

2:40 pm-9:47 pm

1 stop8h 07m

$443
Cheapest one-way
Quickest one-way

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Fri 6/12

5:28 pm-11:57 pm

1 stop5h 29m

$149

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Fri 6/12

10:31 am-7:13 pm

2 stops31h 42m

$255

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Sun 9/6

6:33 am-2:26 pm

1 stop6h 53m

$280

KalispellSt. Louis

FCA - STL

FCASTL

Kalispell Glacier Park

Sun 9/6

12:32 pm-9:22 pm

1 stop7h 50m

$285

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/11

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

Compare providers for flights from Kalispell to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Kalispell to St. Louis in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Kalispell-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Kalispell-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Kalispell-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Kalispell-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Kalispell-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Kalispell to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Kalispell with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Kalispell to St. Louis

What is the cheapest month to book a flight from Kalispell to St. Louis?

Currently, December is the cheapest month in which you can book a flight from Kalispell to St. Louis (average of $221). Flying from Kalispell to St. Louis in September is currently the most expensive (average of $395). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Kalispell to St. Louis?

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated March 12, 2026.
Peruse reviews from past customers who have flown with Delta and United Airlines from Kalispell to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,286 reviews

Food

7.2

Entertainment

7.8

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,286 reviews
Delta
7.9
Good
8,286 reviews

Food

7.2

Entertainment

7.8

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,418 reviews
Delta
7.9
Good
8,286 reviews

Food

7.2

Entertainment

7.8

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Kalispell to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Kalispell to St. Louis?

    Airlines like Delta, United Airlines, and Alaska Airlines fly from Kalispell to St. Louis in about 5h 29m. The time it takes to get you to your destination can typically vary by up to 21h 04m. The distance between Kalispell and St. Louis is about 1358 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Kalispell to St. Louis round-trip?

    Delta, at $205, was found to be the cheapest airline from Kalispell to St. Louis. An alternate airline flying to your destination would be United Airlines. Delta is 57% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Kalispell to St. Louis that include hotel bookings?

    Yes. In addition to deals on Kalispell to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Kalispell to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Kalispell to St. Louis.

  • Can I find deals for business class flights from Kalispell to St. Louis?

    Yes. Cheapflights offers flight deals from Kalispell to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Kalispell to St. Louis?

    Currently, December is the cheapest month in which you can book a flight from Kalispell to St. Louis (average of $221). Flying from Kalispell to St. Louis in September is currently the most expensive (average of $395). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Kalispell to St. Louis

Discover the top 2 airlines that operate flights from Kalispell to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$205Average$356FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$318Average$566FlexibilityNo cancel feeOn-time69%

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