GTF - LHR

$771 Find Cheap Flights from Great Falls to London - Compare and Save

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Great Falls to Heathrow departing on 12/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Great Falls to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Great Falls to London, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$771
United Airlines
Sun 12/6Wed 12/9
GTF - LHR • 2 stops
Top airlines
United Airlines
Cheapest • from $771 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Great Falls and Heathrow. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Denver (DEN)
Cheapest • Avg $1,124 (round-trip)
Denver (DEN)
Shortest trip • 12h 07m (one-way)
Insights
Insights
Insights
Insights
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We hope you love your trip to Heathrow!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Great Falls to Heathrow (GTF-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Great Falls to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Great Falls to Heathrow

Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
2:25 pm - 11:05 am
GTF
-
LHR
37h 40m
2 stops
United Airlines Logo
7:30 am - 9:20 pm
LHR
-
GTF
20h 50m
2 stops
$771United Airlines
Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
2:25 pm - 4:50 pm
GTF
-
LHR
43h 25m
2 stops
United Airlines Logo
11:35 am - 1:29 pm
LHR
-
GTF
32h 54m
1 stop
$780United Airlines
Sun, Dec 6 - Wed, Dec 9
Alaska Airlines Logo
4:55 pm - 12:20 pm
GTF
-
LHR
12h 25m
1 stop
Alaska Airlines Logo
2:45 pm - 4:13 pm
LHR
-
GTF
32h 28m
1 stop
$889Alaska Airlines
Wed, Aug 19 - Sun, Aug 23
KLM Logo
1:08 pm - 10:00 am
GTF
-
LHR
13h 52m
1 stop
KLM Logo
6:30 am - 5:42 pm
LHR
-
GTF
18h 12m
2 stops
$986KLM
Wed, Aug 19 - Sun, Aug 23
Delta Logo
5:40 am - 7:10 am
GTF
-
LHR
18h 30m
2 stops
Delta Logo
6:30 am - 5:38 pm
LHR
-
GTF
18h 08m
2 stops
$991Delta
Wed, Aug 19 - Sun, Aug 23
KLM Logo
1:08 pm - 10:00 am
GTF
-
LHR
13h 52m
1 stop
KLM Logo
10:55 am - 10:38 pm
LHR
-
GTF
18h 43m
1 stop
$1,015KLM
Thu, Aug 27 - Sat, Sep 5
United Airlines Logo
6:15 am - 9:40 am
GTF
-
LHR
20h 25m
1 stop
United Airlines Logo
6:55 am - 9:12 pm
LHR
-
GTF
21h 17m
2 stops
$1,038United Airlines
Thu, Aug 27 - Sat, Sep 5
United Airlines Logo
6:15 am - 9:40 am
GTF
-
LHR
20h 25m
1 stop
United Airlines Logo
6:55 am - 9:12 pm
LHR
-
GTF
21h 17m
2 stops
$1,039United Airlines
Thu, Aug 27 - Sat, Sep 5
United Airlines Logo
6:15 am - 6:55 am
GTF
-
LHR
17h 40m
2 stops
United Airlines Logo
6:55 am - 9:12 pm
LHR
-
GTF
21h 17m
2 stops
$1,043United Airlines
Thu, Aug 27 - Sat, Sep 5
United Airlines Logo
2:25 pm - 12:25 pm
GTF
-
LHR
15h 00m
1 stop
United Airlines Logo
2:50 pm - 9:12 pm
LHR
-
GTF
13h 22m
1 stop
$1,067United Airlines
Booking Insights

KAYAK's insights & trends for Great Falls to Heathrow flights

Get data-powered insights and trends into flights from Great Falls to Heathrow to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Great Falls to London?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 5 days.

In the past 5 days, the cheapest round-trip tickets from Great Falls to London were found on United Airlines ($771) and Alaska Airlines ($889).

Find deals

Good to know

Cheapest flight$771
Flight from Great Falls to London

When to book flights from Great Falls to Heathrow

Are your dates flexible? Find out the best times to travel from Great Falls to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Great Falls to London flights

  • What is the cheapest flight from Great Falls to London Heathrow Airport?

    In the last 5 days, the lowest price for a flight from Great Falls to London Heathrow Airport was $771 for a round-trip ticket.

  • Do I need a passport to fly between Great Falls and London?

    Yes

  • Which airports will I be using when flying from Great Falls to London?

    Great Falls and London are both served by 1 main airport. You will leave Great Falls from Great Falls and will be arriving at London Heathrow.

  • Which aircraft models fly most regularly from Great Falls to London?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Great Falls to London?

    Star Alliance is the only airline alliance operating flights between Great Falls and London.

  • How does KAYAK find such low prices on flights from Great Falls to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Great Falls to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Great Falls to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Great Falls is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Great Falls to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Great Falls with another airline. Booking your flights between Great Falls and LHR can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Great Falls to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Great Falls up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Great Falls to Heathrow

 
See real verified KAYAK customer reviews for airlines flying from Great Falls to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Great Falls to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9845 reviews
7.3Comfort
7.7Boarding
6.6Food
8.1Crew
7.1Entertainment
Airline reviews

Checking bag at terminal was horrible. No agents to check us in and only 1 kiosk working. Boarding went ok. Crew onboard was very scattered rained. Missed our row while serving and then didn’t see them hardly again.

4.0 OkayDavid, Jun 2026
FAR - DEN
Read more United Airlines reviews

Checking bag at terminal was horrible. No agents to check us in and only 1 kiosk working. Boarding went ok. Crew onboard was very scattered rained. Missed our row while serving and then didn’t see them hardly again.

Crew was amazing, takeoff wonderful. The bathroom was disgusting from before takeoff the odor made the flight uncomfortable as you could smell the bathroom from the center of the plane where we were sitting. Smelled like raw sewage. My daughter was throwing up as we landed due to the smell and horrible turbulence as we approached Newark.

Airline tickets are not cheap. You expect reliable competent service. Thanks to canceled flights and botched transfers we arrived at our destination two days late. This is not acceptable

Horrible! Several delays and then was cancelled! I spent over 24 hours in the airport and was unable to get a hotel or food voucher.

The entertainment they offer could use some games, and maybe they could add some cookies to the snack menu. And the automated messages are a bit repetitive. But it was comfortable temperature wise and the seats were comfortable. The crew is very polite and helpful

The entertainment is a bit limited, it would be better if they added some games to play besides the movies and tv shows. But the seats are comfortable and the crew is polite

This planes staff was top tier. Everything went great and had a great flight home.

Food was great. Staff was phenomenal. Seats were a bit hard and could use a lot more entertainment options as far as movies to choose from. WiFi was good. Overall great trip.

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

I was promised by United Airline (operated by ANA) that I will be seated together with my kids as I am the only adult flying with two minors. We did not get seats together in our 11 hours flight from LA to Tokyo. When asked at the gate, ANA representative said United Airline should have informed them that there is a parent flying with two minors. He said they can’t do anything in the system as the flight is full. He ask me to ask passengers next to me and the kids if they are willing to change seats. This is ridiculous! However, I went in the flight and asked other passages but no one willing to change seats. 11 hours and we were seating separately. I was very disappointed with this. It made things super inconvenient for me.

Everything you need to know for your flight from Great Falls to Heathrow

Information on your arrival and departure airports

Great Falls (GTF)
Heathrow (LHR)