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Cheap flights from Great Falls to London from $591

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Great Falls to London departing on 1/12. 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
0 bags

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Find the cheapest flights from Great Falls to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
1:15 pm - 10:00 amGTF-LHR
13h 45m1 stop
KLM Logo
5:50 pm - 5:30 pmLHR-GTF
30h 40m2 stops
$591KLM
Find Deal
Mon, Jan 12 - Mon, Jan 19
KLM Logo
1:15 pm - 10:00 amGTF-LHR
13h 45m1 stop
KLM Logo
5:05 pm - 5:30 pmLHR-GTF
31h 25m2 stops
$599KLM
Find Deal
Mon, Jan 12 - Mon, Jan 19
KLM Logo
1:15 pm - 4:05 pmGTF-LHR
19h 50m2 stops
KLM Logo
8:25 pm - 5:30 pmLHR-GTF
28h 05m2 stops
$623KLM
Find Deal
Mon, Jan 12 - Mon, Jan 19
Delta Logo
6:20 pm - 9:50 amGTF-LHR
32h 30m1 stop
Delta Logo
5:35 pm - 5:39 pmLHR-GTF
31h 04m2 stops
$625Delta
Find Deal
Sun, Apr 19 - Mon, May 4
KLM Logo
1:15 pm - 1:50 pmGTF-LHR
17h 35m2 stops
KLM Logo
8:25 pm - 5:30 pmLHR-GTF
28h 05m2 stops
$630KLM
Find Deal
Mon, Jan 12 - Mon, Jan 19
Delta Logo
6:20 pm - 6:45 amGTF-LHR
29h 25m2 stops
Delta Logo
5:35 pm - 5:39 pmLHR-GTF
31h 04m2 stops
$635Delta
Find Deal
Sat, Apr 18 - Mon, May 4
United Airlines Logo
6:10 am - 9:40 amGTF-LHR
20h 30m1 stop
United Airlines Logo
11:10 am - 9:53 pmLHR-GTF
41h 43m2 stops
$636United Airlines
Find Deal
Sat, Jan 10 - Sat, Jan 17
United Airlines Logo
6:10 am - 11:05 amGTF-LHR
21h 55m2 stops
United Airlines Logo
11:10 am - 1:48 pmLHR-GTF
33h 38m2 stops
$641United Airlines
Find Deal
Sat, Jan 10 - Sat, Jan 17
United Airlines Logo
2:29 pm - 9:40 amGTF-LHR
12h 11m1 stop
United Airlines Logo
11:35 am - 9:43 pmLHR-GTF
17h 08m1 stop
$653United Airlines
Find Deal
Sat, Jan 10 - Sat, Jan 17
United Airlines Logo
2:29 pm - 9:40 amGTF-LHR
12h 11m1 stop
United Airlines Logo
11:35 am - 1:48 pmLHR-GTF
33h 13m1 stop
$654United Airlines
Find Deal
Mon, Jan 12 - Mon, Jan 19

KLM flights from Great Falls to London Heathrow Airport

Our best KLM deals on Great Falls to London Heathrow Airport flight tickets
KLM
Jan 12
GTF1:15 pmGreat Falls
13h 45m
1 stop
LHR10:00 amLondon Heathrow
Jan 19
LHR5:50 pmLondon Heathrow
30h 40m
2 stops
GTF5:30 pmGreat Falls
$591
Find similar
KLM
Jan 12
GTF1:15 pmGreat Falls
13h 45m
1 stop
LHR10:00 amLondon Heathrow
Jan 19
LHR5:05 pmLondon Heathrow
31h 25m
2 stops
GTF5:30 pmGreat Falls
$599
Find similar
KLM
Jan 12
GTF1:15 pmGreat Falls
19h 50m
2 stops
LHR4:05 pmLondon Heathrow
Jan 19
LHR8:25 pmLondon Heathrow
28h 05m
2 stops
GTF5:30 pmGreat Falls
$623
Find similar

Delta flights from Great Falls to London Heathrow Airport

Our best Delta deals on Great Falls to London Heathrow Airport flight tickets
Delta
Apr 19
GTF6:20 pmGreat Falls
32h 30m
1 stop
LHR9:50 amLondon Heathrow
May 4
LHR5:35 pmLondon Heathrow
31h 04m
2 stops
GTF5:39 pmGreat Falls
$625
Find similar
Delta
Apr 18
GTF6:20 pmGreat Falls
29h 25m
2 stops
LHR6:45 amLondon Heathrow
May 4
LHR5:35 pmLondon Heathrow
31h 04m
2 stops
GTF5:39 pmGreat Falls
$635
Find similar
Delta
Apr 17
GTF1:10 pmGreat Falls
17h 00m
2 stops
LHR1:10 pmLondon Heathrow
May 4
LHR5:35 pmLondon Heathrow
31h 04m
2 stops
GTF5:39 pmGreat Falls
$680
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Great Falls to London Heathrow Airport 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 November 29, 2025.
Use the filters below to find and compare flights from Great Falls to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 1/12

1:15 pm-10:00 am

1 stop13h 45m

London Heathrow

Mon 1/19

5:50 pm-5:30 pm

2 stops30h 40m

$591

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 1/12

1:15 pm-10:00 am

1 stop13h 45m

London Heathrow

Mon 1/19

5:05 pm-5:30 pm

2 stops31h 25m

$599

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 1/12

1:15 pm-4:05 pm

2 stops19h 50m

London Heathrow

Mon 1/19

8:25 pm-5:30 pm

2 stops28h 05m

$623

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 4/19

6:20 pm-9:50 am

1 stop32h 30m

London Heathrow

Mon 5/4

5:35 pm-5:39 pm

2 stops31h 04m

$625

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 1/12

1:15 pm-1:50 pm

2 stops17h 35m

London Heathrow

Mon 1/19

8:25 pm-5:30 pm

2 stops28h 05m

$630

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 4/18

6:20 pm-6:45 am

2 stops29h 25m

London Heathrow

Mon 5/4

5:35 pm-5:39 pm

2 stops31h 04m

$635

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 1/10

6:10 am-9:40 am

1 stop20h 30m

London Heathrow

Sat 1/17

11:10 am-9:53 pm

2 stops41h 43m

$636

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 1/10

6:10 am-11:05 am

2 stops21h 55m

London Heathrow

Sat 1/17

11:10 am-1:48 pm

2 stops33h 38m

$641

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 1/10

2:29 pm-9:40 am

1 stop12h 11m

London Heathrow

Sat 1/17

11:35 am-9:43 pm

1 stop17h 08m

$653

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 1/12

2:29 pm-9:40 am

1 stop12h 11m

London Heathrow

Mon 1/19

11:35 am-1:48 pm

1 stop33h 13m

$654

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to London from

How to get the cheapest flight ticket from Great Falls to London Heathrow Airport

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 day to depart on your flight to London Heathrow Airport?

Our data shows that Friday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $710. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,498.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is at noon. momondo users have found flights departing from Great Falls to London Heathrow Airport at noon for as low as $813. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $964.

When to book flights from Great Falls to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Great Falls to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Great Falls to London Heathrow Airport (GTF to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Great Falls to London Heathrow Airport

Fastest flight time

12h 05m

Direct flights

None
The fastest flight from Great Falls to London Heathrow Airport takes 12h 05m
There are no direct flights from Great Falls to London Heathrow Airport. There are no popular flight routes from Great Falls to London Heathrow Airport.
Search flight deals

  • How far is Great Falls to London Heathrow by plane?

    There are 4468.7 mi between Great Falls and London Heathrow. A reasonable flight in good conditions will take 12h 10m.

  • When did momondo last update prices for flights from Great Falls Airport to London Heathrow Airport?

    Prices for flights from Great Falls Airport to London Heathrow Airport were last updated today.

  • How many operators does momondo search for flights from Great Falls Airport to London Heathrow Airport?

  • How old do you have to be to fly from Great Falls Airport to London Heathrow Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Great Falls Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents you'll need for your trip to London Heathrow 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 London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Great Falls to London Heathrow Airport?

Best airlines flying from Great Falls to London Heathrow Airport

Compare and see reviews for airlines that fly from Great Falls to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $645Free CancellationRating
7.4
9,058 reviews
Search United Airlines flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Dover
Luton
Slough
Guildford
Hayes
Dartford
Stratford-upon-Avon
Crawley
Brentwood
Chelmsford
Salisbury
Wembley
Romford
Watford
Ilford
Swindon
Cobham

Why use momondo?

Why should I use momondo to find a flight deal from Great Falls to London?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Great Falls to London. momondo saves you time and could save you money on your trip.

Can I find flights from Great Falls to London with flexible booking policies on momondo?

Yes. All flights to London from Great Falls on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Great Falls to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Great Falls to London.

I’m not ready to book a flight from Great Falls to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Great Falls to London 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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