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Cheap flights from Great Falls to London from $875

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 11/8. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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
6:30 am - 9:40 am
GTF
-
LHR
20h 10m
1 stop
United Airlines Logo
6:35 am - 9:47 pm
LHR
-
GTF
22h 12m
2 stops
$875United Airlines
Sun, Nov 8 - Thu, Nov 12
United Airlines Logo
6:30 am - 9:40 am
GTF
-
LHR
20h 10m
1 stop
United Airlines Logo
6:35 am - 9:47 pm
LHR
-
GTF
22h 12m
2 stops
$876United Airlines
Sun, Nov 8 - Thu, Nov 12
United Airlines Logo
6:30 am - 7:10 am
GTF
-
LHR
17h 40m
2 stops
United Airlines Logo
6:35 am - 9:47 pm
LHR
-
GTF
22h 12m
2 stops
$879United Airlines
Sun, Nov 8 - Thu, Nov 12
Alaska Airlines Logo
4:57 pm - 12:20 pm
GTF
-
LHR
12h 23m
1 stop
Alaska Airlines Logo
2:45 pm - 4:17 pm
LHR
-
GTF
32h 32m
1 stop
$886Alaska Airlines
Sun, Nov 8 - Thu, Nov 12
United Airlines Logo
2:25 pm - 9:40 am
GTF
-
LHR
12h 15m
1 stop
United Airlines Logo
6:55 am - 9:12 pm
LHR
-
GTF
21h 17m
2 stops
$985United Airlines
Thu, Aug 13 - Thu, Aug 20
United Airlines Logo
6:15 am - 7:15 am
GTF
-
LHR
18h 00m
2 stops
United Airlines Logo
6:55 am - 9:12 pm
LHR
-
GTF
21h 17m
2 stops
$990United Airlines
Thu, Aug 13 - Thu, Aug 20
United Airlines Logo
2:25 pm - 9:40 am
GTF
-
LHR
12h 15m
1 stop
United Airlines Logo
2:50 pm - 9:12 pm
LHR
-
GTF
13h 22m
1 stop
$1,014United Airlines
Thu, Aug 13 - Thu, Aug 20
Delta Logo
5:40 am - 10:00 am
GTF
-
LHR
21h 20m
1 stop
Delta Logo
6:30 am - 12:28 pm
LHR
-
GTF
36h 58m
2 stops
$1,328Delta
Mon, Aug 17 - Fri, Aug 21
United Airlines Logo
2:25 pm - 12:25 pm
GTF
-
LHR
15h 00m
1 stop
United Airlines Logo
2:50 pm - 9:12 pm
LHR
-
GTF
13h 22m
1 stop
$1,357United Airlines
Mon, Aug 17 - Fri, Aug 21
Delta Logo
1:17 pm - 1:05 pm
GTF
-
LHR
16h 48m
2 stops
Delta Logo
4:20 pm - 12:37 pm
LHR
-
GTF
27h 17m
2 stops
$1,424Delta
Thu, Jul 16 - Wed, Jul 29

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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
Nov 8
GTF6:30 amGreat Falls
20h 10m
1 stop
LHR9:40 amLondon Heathrow
Nov 12
LHR6:35 amLondon Heathrow
22h 12m
2 stops
GTF9:47 pmGreat Falls
$875
United Airlines
Nov 8
GTF6:30 amGreat Falls
20h 10m
1 stop
LHR9:40 amLondon Heathrow
Nov 12
LHR6:35 amLondon Heathrow
22h 12m
2 stops
GTF9:47 pmGreat Falls
$876
United Airlines
Nov 8
GTF6:30 amGreat Falls
17h 40m
2 stops
LHR7:10 amLondon Heathrow
Nov 12
LHR6:35 amLondon Heathrow
22h 12m
2 stops
GTF9:47 pmGreat Falls
$879

Delta flights from Great Falls to London Heathrow Airport

Our best Delta deals on Great Falls to London Heathrow Airport flight tickets
Delta
Aug 17
GTF5:40 amGreat Falls
21h 20m
1 stop
LHR10:00 amLondon Heathrow
Aug 21
LHR6:30 amLondon Heathrow
36h 58m
2 stops
GTF12:28 pmGreat Falls
$1,328
Delta
Jul 16
GTF1:17 pmGreat Falls
16h 48m
2 stops
LHR1:05 pmLondon Heathrow
Jul 29
LHR4:20 pmLondon Heathrow
27h 17m
2 stops
GTF12:37 pmGreat Falls
$1,424

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 July 3, 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

Sun 11/8

6:30 am-9:40 am

1 stop20h 10m

London Heathrow

Thu 11/12

6:35 am-9:47 pm

2 stops22h 12m

$875

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 11/8

6:30 am-9:40 am

1 stop20h 10m

London Heathrow

Thu 11/12

6:35 am-9:47 pm

2 stops22h 12m

$876

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 11/8

6:30 am-7:10 am

2 stops17h 40m

London Heathrow

Thu 11/12

6:35 am-9:47 pm

2 stops22h 12m

$879

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 11/8

4:57 pm-12:20 pm

1 stop12h 23m

London Heathrow

Thu 11/12

2:45 pm-4:17 pm

1 stop32h 32m

$886

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 8/13

2:25 pm-9:40 am

1 stop12h 15m

London Heathrow

Thu 8/20

6:55 am-9:12 pm

2 stops21h 17m

$985

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 8/13

6:15 am-7:15 am

2 stops18h 00m

London Heathrow

Thu 8/20

6:55 am-9:12 pm

2 stops21h 17m

$990
Quickest round-trip

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 8/13

2:25 pm-9:40 am

1 stop12h 15m

London Heathrow

Thu 8/20

2:50 pm-9:12 pm

1 stop13h 22m

$1,014

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 8/17

5:40 am-10:00 am

1 stop21h 20m

London Heathrow

Fri 8/21

6:30 am-12:28 pm

2 stops36h 58m

$1,328

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 8/17

2:25 pm-12:25 pm

1 stop15h 00m

London Heathrow

Fri 8/21

2:50 pm-9:12 pm

1 stop13h 22m

$1,357

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 7/16

1:17 pm-1:05 pm

2 stops16h 48m

London Heathrow

Wed 7/29

4:20 pm-12:37 pm

2 stops27h 17m

$1,424

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.
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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
9,926 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
Luton
Hayes
Dover
Crawley
Croydon
Wembley
Stansted
Stratford-upon-Avon
Harrow
Slough
Watford
Ilford
Cobham
Brentwood
Folkestone
Guildford
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.

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