How long is the flight from Kalispell to London Heathrow Airport?

Alaska Airlines and United Airlines can get you from Kalispell to London Heathrow Airport in just under 21h 09m. Your travel time can differ by up to 1h 38m. Airlines will cover a distance of 4512 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What is the cheapest airline to fly from Kalispell to London Heathrow Airport round-trip?

Flying on United Airlines is currently your cheapest option to London Heathrow Airport, with prices starting at $836.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

What is the cheapest time of day to fly from FCA to LHR?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kalispell to London Heathrow Airport as you normally would.

Most accurate provider : When it comes to deals on Kalispell-London Heathrow Airport flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Kalispell-London Heathrow Airport flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Kalispell-London Heathrow Airport flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Kalispell-London Heathrow Airport flights, Cheapflights users trust Ovago the most. Ovago 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-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Kalispell to London Heathrow?

Kalispell Glacier Park (FCA), located 8.4 mi from the city center, is the airport you fly out of when you book flights from Kalispell to London Heathrow. 1 airline have flights from Glacier Park to London Heathrow on a regular basis. Booking flights from Kalispell Glacier Park to London Heathrow should not be difficult; the airport handles an average of 0 outbound flights to London Heathrow per day.

Can I find deals for flights from Kalispell to Heathrow that include hotel bookings?

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

How can I find direct flights from Kalispell to Heathrow?

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

Can I find deals for business class flights from Kalispell to Heathrow?

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

$881+ Cheap Flights from Kalispell to London Heathrow Airport

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Cheap flight deals from Kalispell to Heathrow

Cheapest

Best

Last-minute

One-way

Cheapest flights from Kalispell to Heathrow
Explore the most affordable flight options available from Kalispell to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.

Tue 12/12:42 pm -

1 stop11h 58m

Wed 12/93:00 pm -

2 stops37h 51m

Deal found 10/21

$962

Tue 12/11:54 pm -

1 stop15h 16m

Wed 12/92:55 pm -

1 stop15h 26m

Deal found 10/22

$968

Tue 12/11:54 pm -

1 stop15h 26m

Wed 12/92:45 pm -

1 stop15h 36m

Deal found 10/23

$977

Tue 11/106:14 am -

1 stop20h 26m

Tue 11/179:30 am -

2 stops19h 21m

Deal found 10/23

$1,004

Tue 11/107:41 am -

1 stop16h 19m

Tue 11/179:25 am -

1 stop21h 34m

Deal found 10/20

$1,017

Tue 11/101:55 pm -

1 stop15h 25m

Tue 11/172:45 pm -

1 stop16h 14m

Deal found 10/23

$1,027

Best flights from Kalispell to Heathrow
Discover carefully curated flight deals from Kalispell to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.

Tue 3/26:33 am -

1 stop22h 47m

Fri 3/52:45 pm -

1 stop16h 14m

Deal found 10/20

$881

Tue 3/166:31 am -

1 stop21h 09m

Thu 3/253:00 pm -

2 stops36h 40m

Deal found 10/22

$903

Wed 4/76:31 am -

1 stop23h 04m

Tue 4/1311:25 am -

1 stop17h 05m

Deal found 10/20

$922

Tue 3/21:40 pm -

2 stops16h 50m

Fri 3/57:40 am -

2 stops22h 05m

Deal found 10/21

$922

Tue 12/12:42 pm -

1 stop11h 58m

Wed 12/93:00 pm -

2 stops37h 51m

Deal found 10/23

$963

Last-minute flights from Kalispell to Heathrow
Discover last-minute flight deals from Kalispell to Heathrow. Data last updated October 25, 2026 and is based on user searches.

Fri 10/2312:26 pm -

1 stop13h 34m

Fri 10/306:35 am -

2 stops21h 16m

Deal found 10/23

$1,044

Fri 10/235:30 am -

2 stops18h 15m

Fri 10/306:20 am -

2 stops17h 13m

Deal found 10/23

$1,070

Fri 10/231:58 pm -

1 stop13h 52m

Fri 10/304:30 pm -

1 stop26h 57m

Deal found 10/23

$1,075

Fri 10/2312:26 pm -

2 stops14h 34m

Fri 10/303:00 pm -

3 stops28h 34m

Deal found 10/23

$1,089

Fri 10/236:05 am -

1 stop20h 35m

Fri 10/3011:35 am -

1 stop16h 16m

Deal found 10/23

$10,021

Fri 10/232:30 pm -

1 stop12h 10m

Fri 10/3010:25 am -

2 stops17h 26m

Deal found 10/23

$10,030

Tue 11/106:14 am -

1 stop20h 26m

Tue 11/179:30 am -

2 stops19h 21m

Deal found 10/23

$1,004

Tue 11/107:41 am -

1 stop16h 19m

Tue 11/179:25 am -

1 stop21h 34m

Deal found 10/20

$1,017

Tue 11/101:55 pm -

1 stop15h 25m

Tue 11/172:45 pm -

1 stop16h 14m

Deal found 10/23

$1,027

One-way flights from Kalispell to Heathrow
Search for one-way flight options from Kalispell to Heathrow. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.

Fri 12/182:45 pm -

2 stops23h 35m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/22

$986

Fri 12/186:10 am -

2 stops18h 00m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/21

$990

Fri 12/1812:28 pm -

1 stop14h 32m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/21

$1,041

Fri 1/812:51 pm -

1 stop15h 29m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/23

$1,251

Find flight deals from Kalispell to Heathrow

Most accurate provider	Ovago 3 stars
Most trusted provider	Ovago 3 stars
Round-trip from	$881 (Alaska Airlines)

Provider with most accurate pricing for Kalispell Glacier Park-London Heathrow flight deals.

Search Deals

Provider most trusted by Cheapflights users for Kalispell Glacier Park-London Heathrow flights.

Search Deals

From Kalispell Glacier Park to London Heathrow

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Kalispell to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Tue 3/2

6:33 am-12:20 pm

1 stop22h 47m

London Heathrow

Fri 3/5

2:45 pm-11:59 pm

1 stop16h 14m

$881

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Tue 3/16

6:31 am-9:40 am

1 stop21h 09m

London Heathrow

Thu 3/25

3:00 pm-9:40 pm

2 stops36h 40m

$903

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Wed 4/7

6:31 am-12:35 pm

1 stop23h 04m

London Heathrow

Tue 4/13

11:25 am-9:30 pm

1 stop17h 05m

$922

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Tue 3/2

1:40 pm-1:30 pm

2 stops16h 50m

London Heathrow

Fri 3/5

7:40 am-10:45 pm

2 stops22h 05m

$922

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Tue 12/1

2:42 pm-9:40 am

1 stop11h 58m

London Heathrow

Wed 12/9

3:00 pm-9:51 pm

2 stops37h 51m

$963

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Fri 12/18

2:45 pm-9:20 pm

2 stops23h 35m

London Heathrow

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$986

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Fri 12/18

6:10 am-7:10 am

2 stops18h 00m

London Heathrow

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$990

Quickest round-trip

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Fri 12/18

12:28 pm-10:00 am

1 stop14h 32m

London Heathrow

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$1,041

KalispellLondon

FCA Kalispell Glacier Park - LHR London Heathrow

FCALHR

Kalispell Glacier Park

Fri 1/8

12:51 pm-11:20 am

1 stop15h 29m

London Heathrow

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$1,251

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Sorted by cheapest first

Compare providers for flights from Kalispell to Heathrow

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Kalispell to Heathrow in October.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
Ovago	Price Accuracy3 stars	Trust 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-London Heathrow Airport flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Kalispell-London Heathrow Airport flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Kalispell-London Heathrow Airport flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Kalispell-London Heathrow Airport flights, Cheapflights users trust Ovago the most. Ovago 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-London Heathrow Airport 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 Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Kalispell with our price prediction graph.

FCA-LHR

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.

Reviews of airlines servicing Heathrow

Read reviews from past customers who have flown United Airlines from Kalispell to London Heathrow Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.3

Good

10,436 reviews

Reviews

1 / 20

8.0

Excellent

Asha,Sep 2026

LGA - IAH

The flight was on time and boardi g was very organized and timely. Snacks are awful and having one little glass of juice was terrible. Fortunately, I had my water to keep me hydrated.

United Airlines

7.3

Good

10,436 reviews

United Airlines

7.3

Good

10,436 reviews

Reviews

1 / 20

8.0

Excellent

Asha,Sep 2026

LGA - IAH

The flight was on time and boardi g was very organized and timely. Snacks are awful and having one little glass of juice was terrible. Fortunately, I had my water to keep me hydrated.

Related info for your journey

What airport do you fly from for flights from Kalispell to London Heathrow?
Kalispell Glacier Park (FCA), located 8.4 mi from the city center, is the airport you fly out of when you book flights from Kalispell to London Heathrow. 1 airline have flights from Glacier Park to London Heathrow on a regular basis. Booking flights from Kalispell Glacier Park to London Heathrow should not be difficult; the airport handles an average of 0 outbound flights to London Heathrow per day.
How long is the flight from Kalispell to London Heathrow Airport?
Alaska Airlines and United Airlines can get you from Kalispell to London Heathrow Airport in just under 21h 09m. Your travel time can differ by up to 1h 38m. Airlines will cover a distance of 4512 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What is the cheapest airline to fly from Kalispell to London Heathrow Airport round-trip?
Flying on United Airlines is currently your cheapest option to London Heathrow Airport, with prices starting at $836.
Can I find deals for flights from Kalispell to Heathrow that include hotel bookings?
Yes. In addition to deals on Kalispell to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Kalispell to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Kalispell to Heathrow.
Can I find deals for business class flights from Kalispell to Heathrow?
Yes. Cheapflights offers flight deals from Kalispell to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Top airline flying from Kalispell to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$836	Average$1,189	FlexibilityNo cancel fee	On-time69%

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$881+ Cheap flights from Kalispell (FCA) to Heathrow (LHR)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/2. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Kalispell to Heathrow with Cheapflights

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2. Select your favorite providers

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Cheap flight deals from Kalispell to Heathrow

Cheapest flights from Kalispell to HeathrowExplore the most affordable flight options available from Kalispell to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.

Explore the most affordable flight options available from Kalispell to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.

Best flights from Kalispell to HeathrowDiscover carefully curated flight deals from Kalispell to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.

Discover carefully curated flight deals from Kalispell to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.

Last-minute flights from Kalispell to HeathrowDiscover last-minute flight deals from Kalispell to Heathrow. Data last updated October 25, 2026 and is based on user searches.

Discover last-minute flight deals from Kalispell to Heathrow. Data last updated October 25, 2026 and is based on user searches.

One-way flights from Kalispell to HeathrowSearch for one-way flight options from Kalispell to Heathrow. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.

Search for one-way flight options from Kalispell to Heathrow. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.

Find flight deals from Kalispell to Heathrow

Most accurate provider

Most trusted provider

Round-trip from

Cheapflights Fare Finder

Use the filters below to find and compare flights from Kalispell to London Heathrow Airport that are best for you.

Compare providers for flights from Kalispell to Heathrow

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 Heathrow in October.

Best time to book a flight from Kalispell to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Kalispell with our price prediction graph.

Reviews of airlines servicing Heathrow

Read reviews from past customers who have flown United Airlines from Kalispell to London Heathrow Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Kalispell to London Heathrow?

How long is the flight from Kalispell to London Heathrow Airport?

What is the cheapest airline to fly from Kalispell to London Heathrow Airport round-trip?

Can I find deals for flights from Kalispell to Heathrow that include hotel bookings?

How can I find direct flights from Kalispell to Heathrow?

Can I find deals for business class flights from Kalispell to Heathrow?

Traveling to a place near London Heathrow Airport?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Kalispell to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Heathrow by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Kalispell to Heathrow by cabin class

Find flights from Kalispell to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Other flights to Heathrow

Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 25, 2026.

Kalispell and Heathrow flights

Browse other Kalispell and Heathrow flight options. Last updated on October 25, 2026.

Other flights from Kalispell

Browse through other flights departing from Kalispell. Flights are based on user searches made on Cheapflights and were last updated on October 25, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Top airline flying from Kalispell to Heathrow

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Book with Flexibility

Travel Smart

Cheapest flights from Kalispell to Heathrow
Explore the most affordable flight options available from Kalispell to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.

Best flights from Kalispell to Heathrow
Discover carefully curated flight deals from Kalispell to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.

Last-minute flights from Kalispell to Heathrow
Discover last-minute flight deals from Kalispell to Heathrow. Data last updated October 25, 2026 and is based on user searches.

One-way flights from Kalispell to Heathrow
Search for one-way flight options from Kalispell to Heathrow. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.