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Cheap flights from Great Falls to London from $792

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 5/2. 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.
United Airlines Logo
2:35 pm - 10:00 am
GTF
-
LHR
36h 25m
2 stops
United Airlines Logo
10:50 am - 1:34 pm
LHR
-
GTF
33h 44m
2 stops
$792United Airlines
Sat, May 2 - Tue, May 12
United Airlines Logo
2:30 pm - 8:35 am
GTF
-
LHR
59h 05m
2 stops
United Airlines Logo
7:25 am - 1:34 pm
LHR
-
GTF
37h 09m
2 stops
$797United Airlines
Fri, Apr 17 - Fri, May 8
United Airlines Logo
2:30 pm - 12:20 pm
GTF
-
LHR
14h 50m
1 stop
United Airlines Logo
7:30 am - 9:18 pm
LHR
-
GTF
20h 48m
2 stops
$799United Airlines
Mon, Apr 27 - Thu, May 14
United Airlines Logo
6:15 am - 12:25 pm
GTF
-
LHR
23h 10m
1 stop
United Airlines Logo
5:40 pm - 9:18 pm
LHR
-
GTF
34h 38m
2 stops
$801United Airlines
Tue, Apr 14 - Wed, May 6
United Airlines Logo
2:30 pm - 9:40 am
GTF
-
LHR
12h 10m
1 stop
United Airlines Logo
11:25 am - 9:18 pm
LHR
-
GTF
16h 53m
1 stop
$816United Airlines
Mon, Apr 27 - Fri, May 15
United Airlines Logo
6:15 am - 6:30 am
GTF
-
LHR
17h 15m
2 stops
United Airlines Logo
11:25 am - 9:18 pm
LHR
-
GTF
16h 53m
1 stop
$820United Airlines
Tue, Apr 14 - Fri, May 1
United Airlines Logo
2:35 pm - 9:35 pm
GTF
-
LHR
24h 00m
2 stops
United Airlines Logo
2:50 pm - 9:18 pm
LHR
-
GTF
13h 28m
1 stop
$821United Airlines
Sat, May 2 - Fri, May 15
United Airlines Logo
2:30 pm - 6:30 am
GTF
-
LHR
33h 00m
2 stops
United Airlines Logo
10:00 am - 9:18 pm
LHR
-
GTF
18h 18m
2 stops
$824United Airlines
Sat, Apr 18 - Tue, May 5
United Airlines Logo
2:30 pm - 6:35 am
GTF
-
LHR
57h 05m
2 stops
United Airlines Logo
2:50 pm - 9:18 pm
LHR
-
GTF
13h 28m
1 stop
$825United Airlines
Fri, Apr 17 - Fri, May 8
United Airlines Logo
2:35 pm - 12:20 pm
GTF
-
LHR
14h 45m
1 stop
United Airlines Logo
7:25 am - 9:18 pm
LHR
-
GTF
20h 53m
2 stops
$838United Airlines
Thu, Apr 30 - Wed, May 13

Delta flights from Great Falls to London Heathrow Airport

Our best Delta deals on Great Falls to London Heathrow Airport flight tickets
Delta
Apr 27
GTF5:30 amGreat Falls
23h 40m
2 stops
LHR12:10 pmLondon Heathrow
May 13
LHR6:30 amLondon Heathrow
22h 56m
2 stops
GTF10:26 pmGreat Falls
$918
Delta
Apr 15
GTF1:09 pmGreat Falls
17h 41m
2 stops
LHR1:50 pmLondon Heathrow
May 8
LHR6:30 amLondon Heathrow
18h 09m
2 stops
GTF5:39 pmGreat Falls
$922
Delta
Apr 27
GTF1:09 pmGreat Falls
24h 01m
2 stops
LHR8:10 pmLondon Heathrow
May 13
LHR6:15 amLondon Heathrow
18h 24m
2 stops
GTF5:39 pmGreat Falls
$925

KLM flights from Great Falls to London Heathrow Airport

Our best KLM deals on Great Falls to London Heathrow Airport flight tickets
KLM
Apr 16
GTF1:09 pmGreat Falls
19h 26m
2 stops
LHR3:35 pmLondon Heathrow
May 8
LHR6:30 amLondon Heathrow
18h 09m
2 stops
GTF5:39 pmGreat Falls
$968
KLM
Apr 16
GTF1:09 pmGreat Falls
19h 26m
2 stops
LHR3:35 pmLondon Heathrow
May 9
LHR10:55 amLondon Heathrow
13h 44m
1 stop
GTF5:39 pmGreat Falls
$1,271

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 March 9, 2026.
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

Cheapest round-trip

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 5/2

2:35 pm-10:00 am

2 stops36h 25m

London Heathrow

Tue 5/12

10:50 am-1:34 pm

2 stops33h 44m

$792

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 4/17

2:30 pm-8:35 am

2 stops59h 05m

London Heathrow

Fri 5/8

7:25 am-1:34 pm

2 stops37h 09m

$797

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 4/27

2:30 pm-12:20 pm

1 stop14h 50m

London Heathrow

Thu 5/14

7:30 am-9:18 pm

2 stops20h 48m

$799

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Tue 4/14

6:15 am-12:25 pm

1 stop23h 10m

London Heathrow

Wed 5/6

5:40 pm-9:18 pm

2 stops34h 38m

$801
Quickest round-trip

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 4/27

2:30 pm-9:40 am

1 stop12h 10m

London Heathrow

Fri 5/15

11:25 am-9:18 pm

1 stop16h 53m

$816

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Tue 4/14

6:15 am-6:30 am

2 stops17h 15m

London Heathrow

Fri 5/1

11:25 am-9:18 pm

1 stop16h 53m

$820

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 5/2

2:35 pm-9:35 pm

2 stops24h 00m

London Heathrow

Fri 5/15

2:50 pm-9:18 pm

1 stop13h 28m

$821

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 4/18

2:30 pm-6:30 am

2 stops33h 00m

London Heathrow

Tue 5/5

10:00 am-9:18 pm

2 stops18h 18m

$824

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 4/17

2:30 pm-6:35 am

2 stops57h 05m

London Heathrow

Fri 5/8

2:50 pm-9:18 pm

1 stop13h 28m

$825

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 4/30

2:35 pm-12:20 pm

1 stop14h 45m

London Heathrow

Wed 5/13

7:25 am-9:18 pm

2 stops20h 53m

$838

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

59h 05m

Direct flights

None
The fastest flight from Great Falls to London Heathrow Airport takes 59h 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 59h 05m.

  • 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
9,408 reviews
Search United Airlines flights

  • How do I get Price Alerts for flights from Great Falls to London Heathrow Airport?

    Price Alerts will notify you by email when the price for flights to London Heathrow Airport from Great Falls decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from Great Falls to London Heathrow Airport with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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
Crawley
Stratford-upon-Avon
Hayes
Wembley
Dartford
Croydon
Brentwood
Harrow
Watford
Guildford
Stansted
Cobham
Folkestone
Romford

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.

An easier way to manage your London Heathrow Airport trip

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