Cheap flights from Great Falls to London from £563

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Great Falls to London departing on 17/8. 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
0 bags
Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.

Find the cheapest flights from Great Falls to London

Cheap return flights

Enter your travel dates to find the best prices.
United Airlines Logo
06:15 - 10:00
GTF
-
LHR
20h 45m
2 stops
United Airlines Logo
06:55 - 21:12
LHR
-
GTF
21h 17m
2 stops
£563United Airlines
Mon, 17 Aug - Wed, 19 Aug
United Airlines Logo
14:25 - 12:25
GTF
-
LHR
15h 00m
1 stop
United Airlines Logo
06:55 - 21:12
LHR
-
GTF
21h 17m
2 stops
£622United Airlines
Mon, 17 Aug - Wed, 19 Aug
Delta Logo
13:08 - 10:00
GTF
-
LHR
13h 52m
1 stop
Delta Logo
06:30 - 17:42
LHR
-
GTF
18h 12m
2 stops
£652Delta
Mon, 17 Aug - Thu, 20 Aug
Delta Logo
18:28 - 06:20
GTF
-
LHR
28h 52m
2 stops
Delta Logo
06:30 - 17:42
LHR
-
GTF
18h 12m
2 stops
£656Delta
Mon, 17 Aug - Thu, 20 Aug
Delta Logo
13:08 - 10:00
GTF
-
LHR
13h 52m
1 stop
Delta Logo
10:55 - 22:48
LHR
-
GTF
18h 53m
1 stop
£674Delta
Mon, 17 Aug - Wed, 19 Aug
KLM Logo
18:20 - 10:00
GTF
-
LHR
32h 40m
1 stop
KLM Logo
06:30 - 22:44
LHR
-
GTF
23h 14m
2 stops
£692KLM
Sun, 13 Sep - Sat, 19 Sep
Delta Logo
18:28 - 10:00
GTF
-
LHR
32h 32m
1 stop
Delta Logo
06:30 - 17:42
LHR
-
GTF
18h 12m
2 stops
£697Delta
Tue, 11 Aug - Thu, 20 Aug
Delta Logo
18:28 - 10:00
GTF
-
LHR
32h 32m
1 stop
Delta Logo
08:40 - 22:48
LHR
-
GTF
21h 08m
2 stops
£698Delta
Tue, 11 Aug - Wed, 19 Aug
KLM Logo
18:20 - 19:25
GTF
-
LHR
18h 05m
2 stops
KLM Logo
06:30 - 22:44
LHR
-
GTF
23h 14m
2 stops
£699KLM
Sun, 13 Sep - Sat, 19 Sep
Delta Logo
18:28 - 10:00
GTF
-
LHR
32h 32m
1 stop
Delta Logo
17:35 - 17:42
LHR
-
GTF
31h 07m
2 stops
£712Delta
Tue, 11 Aug - Tue, 18 Aug

United Airlines flights from Great Falls to London

Our best United Airlines deals on Great Falls to London flight tickets
United Airlines
17 Aug
GTF06:15Great Falls
20h 45m
2 stops
LHR10:00London Heathrow
19 Aug
LHR06:55London Heathrow
21h 17m
2 stops
GTF21:12Great Falls
£563
United Airlines
17 Aug
GTF14:25Great Falls
15h 00m
1 stop
LHR12:25London Heathrow
19 Aug
LHR06:55London Heathrow
21h 17m
2 stops
GTF21:12Great Falls
£622
United Airlines
12 Aug
GTF14:25Great Falls
15h 10m
1 stop
LHR12:35London Heathrow
25 Aug
LHR14:50London Heathrow
13h 22m
1 stop
GTF21:12Great Falls
£722

Delta flights from Great Falls to London

Our best Delta deals on Great Falls to London flight tickets
Delta
17 Aug
GTF13:08Great Falls
13h 52m
1 stop
LHR10:00London Heathrow
20 Aug
LHR06:30London Heathrow
18h 12m
2 stops
GTF17:42Great Falls
£652
Delta
17 Aug
GTF18:28Great Falls
28h 52m
2 stops
LHR06:20London Heathrow
20 Aug
LHR06:30London Heathrow
18h 12m
2 stops
GTF17:42Great Falls
£656
Delta
17 Aug
GTF05:40Great Falls
21h 20m
1 stop
LHR10:00London Heathrow
20 Aug
LHR10:55London Heathrow
18h 53m
1 stop
GTF22:48Great Falls
£674

momondo Fare Finder

 
Customise your flight search to find flights from Great Falls to London 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 279,928 searches. Data last updated 21 May 2026.
Use the filters below to find and compare flights from Great Falls to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 17/8

06:15-10:00

2 stops20h 45m

London Heathrow

Wed 19/8

06:55-21:12

2 stops21h 17m

£563

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 17/8

14:25-12:25

1 stop15h 00m

London Heathrow

Wed 19/8

06:55-21:12

2 stops21h 17m

£622
Fastest return journey

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 17/8

13:08-10:00

1 stop13h 52m

London Heathrow

Thu 20/8

06:30-17:42

2 stops18h 12m

£652

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 17/8

18:28-06:20

2 stops28h 52m

London Heathrow

Thu 20/8

06:30-17:42

2 stops18h 12m

£656

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 17/8

13:08-10:00

1 stop13h 52m

London Heathrow

Wed 19/8

10:55-22:48

1 stop18h 53m

£674

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 13/9

18:20-10:00

1 stop32h 40m

London Heathrow

Sat 19/9

06:30-22:44

2 stops23h 14m

£692

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Tue 11/8

18:28-10:00

1 stop32h 32m

London Heathrow

Thu 20/8

06:30-17:42

2 stops18h 12m

£697

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Tue 11/8

18:28-10:00

1 stop32h 32m

London Heathrow

Wed 19/8

08:40-22:48

2 stops21h 08m

£698

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 13/9

18:20-19:25

2 stops18h 05m

London Heathrow

Sat 19/9

06:30-22:44

2 stops23h 14m

£699

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Tue 11/8

18:28-10:00

1 stop32h 32m

London Heathrow

Tue 18/8

17:35-17:42

2 stops31h 07m

£712

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

When to book flights from Great Falls to London

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

Cheap Great Falls to London (GTF to LON) flight deals and tips

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

Fastest flight time

12h 15m

Direct flights

None
The fastest flight from Great Falls to London takes 12h 15m
There are no direct flights from Great Falls to London. There are no popular flight routes from Great Falls to London.

Frequently asked questions about flying from Great Falls to London

  • How far is Great Falls to London by plane?

    The straight-line distance from Great Falls to London is 4477.2 mi. Flights usually cover this in 12h 15m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Great Falls Airport to London are refreshed on a daily basis.

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

    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.

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

    The required travel and health documents for your London trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Frequently asked questions about flying from Great Falls to London

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

    Search flight deals from Great Falls to London. While viewing offers you’ll have the option to create a Price Alert.

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

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • 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.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Wembley
Slough
Maidstone
Ipswich
Southend-on-Sea
Canterbury
Ilford
Hayes
Guildford
Folkestone
Chelmsford
Dover
Bedford
Chichester
Harlow
Colchester

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?

Once all potential Great Falls to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are not ready to book a flight from Great Falls to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

An easier way to manage your London trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 20/6
Sat 27/6

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London