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Cheap flights from Great Falls to London from $1,013

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 10/9. 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
2:25 pm - 9:40 am
GTF
-
LHR
12h 15m
1 stop
United Airlines Logo
7:45 am - 9:21 pm
LHR
-
GTF
20h 36m
2 stops
$1,013United Airlines
Fri, Oct 9 - Sat, Oct 17
United Airlines Logo
2:25 pm - 8:35 am
GTF
-
LHR
59h 10m
2 stops
United Airlines Logo
7:45 am - 9:21 pm
LHR
-
GTF
20h 36m
2 stops
$1,055United Airlines
Fri, Oct 9 - Sat, Oct 17
KLM Logo
6:20 pm - 10:00 am
GTF
-
LHR
32h 40m
1 stop
KLM Logo
10:55 am - 10:53 pm
LHR
-
GTF
18h 58m
1 stop
$1,068KLM
Fri, Oct 9 - Sat, Oct 17
United Airlines Logo
6:15 am - 9:40 am
GTF
-
LHR
20h 25m
1 stop
United Airlines Logo
9:30 am - 9:34 pm
LHR
-
GTF
43h 04m
2 stops
$1,292United Airlines
Sun, Jun 7 - Sun, Jun 14
United Airlines Logo
6:15 am - 10:00 am
GTF
-
LHR
20h 45m
2 stops
United Airlines Logo
9:30 am - 9:34 pm
LHR
-
GTF
43h 04m
2 stops
$1,295United Airlines
Sun, Jun 7 - Sun, Jun 14
United Airlines Logo
6:15 am - 9:40 am
GTF
-
LHR
20h 25m
1 stop
United Airlines Logo
2:50 pm - 9:34 pm
LHR
-
GTF
13h 44m
1 stop
$1,312United Airlines
Sun, Jun 7 - Sun, Jun 14
United Airlines Logo
2:37 pm - 9:40 am
GTF
-
LHR
12h 03m
1 stop
United Airlines Logo
9:30 am - 9:34 pm
LHR
-
GTF
19h 04m
2 stops
$1,316United Airlines
Thu, Jul 16 - Wed, Jul 22
United Airlines Logo
2:37 pm - 12:25 pm
GTF
-
LHR
14h 48m
1 stop
United Airlines Logo
11:25 am - 9:34 pm
LHR
-
GTF
17h 09m
1 stop
$1,454United Airlines
Thu, Jul 16 - Wed, Jul 22
Multiple Airlines Logo
1:22 pm - 5:40 pm
GTF
-
LHR
21h 18m
3 stops
Multiple Airlines Logo
10:20 am - 12:40 pm
LHR
-
GTF
33h 20m
3 stops
$2,699Multiple Airlines
Sun, Jun 7 - Sun, Jun 14
Multiple Airlines Logo
5:30 am - 1:35 pm
GTF
-
LHR
25h 05m
3 stops
Multiple Airlines Logo
10:20 am - 12:27 pm
LHR
-
GTF
33h 07m
3 stops
$4,640Multiple Airlines
Fri, Oct 9 - Sat, Oct 17

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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
Oct 9
GTF2:25 pmGreat Falls
12h 15m
1 stop
LHR9:40 amLondon Heathrow
Oct 17
LHR7:45 amLondon Heathrow
20h 36m
2 stops
GTF9:21 pmGreat Falls
$1,013
United Airlines
Oct 9
GTF2:25 pmGreat Falls
59h 10m
2 stops
LHR8:35 amLondon Heathrow
Oct 17
LHR7:45 amLondon Heathrow
20h 36m
2 stops
GTF9:21 pmGreat Falls
$1,055
United Airlines
Jun 7
GTF6:15 amGreat Falls
20h 25m
1 stop
LHR9:40 amLondon Heathrow
Jun 14
LHR9:30 amLondon Heathrow
43h 04m
2 stops
GTF9:34 pmGreat Falls
$1,292

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 April 26, 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

Fri 10/9

2:25 pm-9:40 am

1 stop12h 15m

London Heathrow

Sat 10/17

7:45 am-9:21 pm

2 stops20h 36m

$1,013

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 10/9

2:25 pm-8:35 am

2 stops59h 10m

London Heathrow

Sat 10/17

7:45 am-9:21 pm

2 stops20h 36m

$1,055

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 10/9

6:20 pm-10:00 am

1 stop32h 40m

London Heathrow

Sat 10/17

10:55 am-10:53 pm

1 stop18h 58m

$1,068

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 6/7

6:15 am-9:40 am

1 stop20h 25m

London Heathrow

Sun 6/14

9:30 am-9:34 pm

2 stops43h 04m

$1,292

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 6/7

6:15 am-10:00 am

2 stops20h 45m

London Heathrow

Sun 6/14

9:30 am-9:34 pm

2 stops43h 04m

$1,295

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 6/7

6:15 am-9:40 am

1 stop20h 25m

London Heathrow

Sun 6/14

2:50 pm-9:34 pm

1 stop13h 44m

$1,312
Quickest round-trip

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 7/16

2:37 pm-9:40 am

1 stop12h 03m

London Heathrow

Wed 7/22

9:30 am-9:34 pm

2 stops19h 04m

$1,316

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 7/16

2:37 pm-12:25 pm

1 stop14h 48m

London Heathrow

Wed 7/22

11:25 am-9:34 pm

1 stop17h 09m

$1,454

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 6/7

1:22 pm-5:40 pm

3 stops21h 18m

London Heathrow

Sun 6/14

10:20 am-12:40 pm

3 stops33h 20m

$2,699

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Fri 10/9

5:30 am-1:35 pm

3 stops25h 05m

London Heathrow

Sat 10/17

10:20 am-12:27 pm

3 stops33h 07m

$4,640

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

12h 15m

Direct flights

None
The fastest flight from Great Falls to London Heathrow Airport takes 12h 15m
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

Frequently asked questions about flying from Great Falls to London Heathrow Airport

  • 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 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
9,657 reviews
Search United Airlines flights

Frequently asked questions about flying from Great Falls to London Heathrow Airport

  • 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
Hounslow
Gatwick
Milton Keynes
Dover
Luton
Hayes
Stratford-upon-Avon
Crawley
Slough
Wembley
Stansted
Watford
Croydon
Uxbridge
Brentwood
Dartford
Cobham
Folkestone
Romford
Harrow

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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