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Cheap flights from Great Falls to London from $977

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 3/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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Delta Logo
5:30 am - 10:55 amGTF-LHR
23h 25m2 stops
Delta Logo
5:25 pm - 5:44 pmLHR-GTF
31h 19m2 stops
$977Delta
Find Deal
Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
2:25 pm - 9:40 amGTF-LHR
13h 15m1 stop
United Airlines Logo
3:50 pm - 9:15 pmLHR-GTF
36h 25m2 stops
$1,048United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
7:00 am - 10:25 amGTF-LHR
21h 25m2 stops
United Airlines Logo
3:50 pm - 9:15 pmLHR-GTF
36h 25m2 stops
$1,052United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
2:25 pm - 9:40 amGTF-LHR
13h 15m1 stop
United Airlines Logo
11:25 am - 1:29 pmLHR-GTF
33h 04m1 stop
$1,064United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
7:00 am - 11:05 amGTF-LHR
22h 05m2 stops
United Airlines Logo
11:05 am - 9:15 pmLHR-GTF
17h 10m2 stops
$1,069United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
Delta Logo
1:10 pm - 10:00 amGTF-LHR
14h 50m1 stop
Delta Logo
10:55 am - 10:53 pmLHR-GTF
18h 58m1 stop
$1,098Delta
Find Deal
Fri, Mar 27 - Tue, Mar 31
Delta Logo
1:12 pm - 8:10 pmGTF-LHR
23h 58m2 stops
Delta Logo
6:20 am - 10:30 pmLHR-GTF
23h 10m2 stops
$1,360Delta
Find Deal
Fri, Nov 21 - Fri, Nov 28
United Airlines Logo
6:20 am - 10:25 amGTF-LHR
21h 05m2 stops
United Airlines Logo
11:35 am - 10:39 pmLHR-GTF
18h 04m1 stop
$1,505United Airlines
Find Deal
Fri, Nov 21 - Fri, Nov 28
Multiple Airlines Logo
7:42 pm - 12:20 pmGTF-LHR
33h 38m1 stop
Multiple Airlines Logo
9:25 am - 7:02 pmLHR-GTF
16h 37m1 stop
$1,772Multiple Airlines
Find Deal
Fri, Nov 21 - Fri, Nov 28
United Airlines Logo
6:20 am - 10:50 amGTF-LHR
21h 30m2 stops
United Airlines Logo
4:20 pm - 1:33 pmLHR-GTF
28h 13m3 stops
$2,113United Airlines
Find Deal
Fri, Nov 21 - Fri, Nov 28

United Airlines flights from Great Falls to London Heathrow Airport

Our best United Airlines deals on Great Falls to London Heathrow Airport flight tickets
United Airlines
Mar 27
GTF2:25 pmGreat Falls
13h 15m
1 stop
LHR9:40 amLondon Heathrow
Mar 31
LHR3:50 pmLondon Heathrow
36h 25m
2 stops
GTF9:15 pmGreat Falls
$1,048
Find similar
United Airlines
Mar 27
GTF7:00 amGreat Falls
21h 25m
2 stops
LHR10:25 amLondon Heathrow
Mar 31
LHR3:50 pmLondon Heathrow
36h 25m
2 stops
GTF9:15 pmGreat Falls
$1,052
Find similar
United Airlines
Mar 27
GTF2:25 pmGreat Falls
13h 15m
1 stop
LHR9:40 amLondon Heathrow
Mar 31
LHR11:25 amLondon Heathrow
33h 04m
1 stop
GTF1:29 pmGreat Falls
$1,064
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
Mar 27
GTF5:30 amGreat Falls
23h 25m
2 stops
LHR10:55 amLondon Heathrow
Mar 31
LHR5:25 pmLondon Heathrow
31h 19m
2 stops
GTF5:44 pmGreat Falls
$977
Find similar
Delta
Mar 27
GTF1:10 pmGreat Falls
14h 50m
1 stop
LHR10:00 amLondon Heathrow
Mar 31
LHR10:55 amLondon Heathrow
18h 58m
1 stop
GTF10:53 pmGreat Falls
$1,098
Find similar
Delta
Nov 21
GTF1:12 pmGreat Falls
23h 58m
2 stops
LHR8:10 pmLondon Heathrow
Nov 28
LHR6:20 amLondon Heathrow
23h 10m
2 stops
GTF10:30 pmGreat Falls
$1,360
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 October 9, 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

Fri 3/27

5:30 am-10:55 am

2 stops23h 25m

London Heathrow

Tue 3/31

5:25 pm-5:44 pm

2 stops31h 19m

$977

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 3/27

2:25 pm-9:40 am

1 stop13h 15m

London Heathrow

Tue 3/31

3:50 pm-9:15 pm

2 stops36h 25m

$1,048

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 3/27

7:00 am-10:25 am

2 stops21h 25m

London Heathrow

Tue 3/31

3:50 pm-9:15 pm

2 stops36h 25m

$1,052

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 3/27

2:25 pm-9:40 am

1 stop13h 15m

London Heathrow

Tue 3/31

11:25 am-1:29 pm

1 stop33h 04m

$1,064

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 3/27

7:00 am-11:05 am

2 stops22h 05m

London Heathrow

Tue 3/31

11:05 am-9:15 pm

2 stops17h 10m

$1,069

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 3/27

1:10 pm-10:00 am

1 stop14h 50m

London Heathrow

Tue 3/31

10:55 am-10:53 pm

1 stop18h 58m

$1,098

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 11/21

1:12 pm-8:10 pm

2 stops23h 58m

London Heathrow

Fri 11/28

6:20 am-10:30 pm

2 stops23h 10m

$1,360

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 11/21

6:20 am-10:25 am

2 stops21h 05m

London Heathrow

Fri 11/28

11:35 am-10:39 pm

1 stop18h 04m

$1,505

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 11/21

7:42 pm-12:20 pm

1 stop33h 38m

London Heathrow

Fri 11/28

9:25 am-7:02 pm

1 stop16h 37m

$1,772

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 11/21

6:20 am-10:50 am

2 stops21h 30m

London Heathrow

Fri 11/28

4:20 pm-1:33 pm

3 stops28h 13m

$2,113

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

Direct flights

None
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 13h 15m.

  • 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
8,968 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
Luton
Dover
Slough
Guildford
Dartford
Hayes
Crawley
Chelmsford
Brentwood
Salisbury
Colchester
Ilford
Folkestone
Romford
Swindon
Stratford-upon-Avon
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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