GTF - LHR

$623 Find Cheap Flights from Great Falls to London

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 9/29. 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

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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Flight Deals

Cheap Flights from Great Falls to London (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 London 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

Mon, Sep 29 - Wed, Oct 8
Delta Logo
1:05 pm - 9:50 amGTF-LHR
13h 45m1 stop
Delta Logo
6:15 am - 11:06 pmLHR-GTF
23h 51m2 stops
$623Delta
Find Deal
Mon, Sep 29 - Wed, Oct 8
Delta Logo
6:11 pm - 6:25 amGTF-LHR
29h 14m2 stops
Delta Logo
6:15 am - 11:06 pmLHR-GTF
23h 51m2 stops
$627Delta
Find Deal
Mon, Sep 29 - Wed, Oct 8
KLM Logo
1:05 pm - 9:50 amGTF-LHR
13h 45m1 stop
KLM Logo
11:00 am - 5:29 pmLHR-GTF
13h 29m1 stop
$631KLM
Find Deal

Everything you should know

Top airlines
Delta
Cheapest • from $623 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$623
Delta
Mon 9/29Wed 10/8
GTF - LHR • 1 stop
Cheapest one-way
Multiple Airlines
Tue 9/16
GTF - LHR • multi-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
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 72 hours.

In the past 3 days, the cheapest round-trip tickets from Great Falls to London were found on Delta ($623) and KLM ($631).

Find deals

Good to know

Cheapest flight$623
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 3 days, the lowest price for a flight from Great Falls to London Heathrow Airport was $623 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?

    SkyTeam 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 8929 reviews
7.3Comfort
6.6Food
8.1Crew
7.7Boarding
7.1Entertainment
Airline reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

2.0 MediocreAnonymous, Sep 2025SFO - MEX
Read more United Airlines reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

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)

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