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Cheap flights from Great Falls to London from $741

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 4/15. 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
6:15 am - 12:20 pm
GTF
-
LHR
23h 05m
1 stop
United Airlines Logo
10:50 am - 1:31 pm
LHR
-
GTF
33h 41m
2 stops
$741United Airlines
Wed, Apr 15 - Wed, Apr 22
United Airlines Logo
6:15 am - 10:00 am
GTF
-
LHR
20h 45m
2 stops
United Airlines Logo
10:50 am - 1:31 pm
LHR
-
GTF
33h 41m
2 stops
$744United Airlines
Wed, Apr 15 - Wed, Apr 22
United Airlines Logo
2:35 pm - 10:00 am
GTF
-
LHR
36h 25m
2 stops
United Airlines Logo
9:00 am - 1:34 pm
LHR
-
GTF
35h 34m
2 stops
$745United Airlines
Sat, May 2 - Tue, May 12
United Airlines Logo
6:15 am - 9:40 am
GTF
-
LHR
20h 25m
1 stop
United Airlines Logo
4:25 pm - 9:18 pm
LHR
-
GTF
35h 53m
2 stops
$751United Airlines
Wed, Apr 15 - Tue, May 5
United Airlines Logo
2:30 pm - 12:20 pm
GTF
-
LHR
14h 50m
1 stop
United Airlines Logo
5:40 pm - 9:18 pm
LHR
-
GTF
34h 38m
2 stops
$754United Airlines
Wed, Apr 15 - Fri, May 1
United Airlines Logo
6:15 am - 6:30 am
GTF
-
LHR
17h 15m
2 stops
United Airlines Logo
5:40 pm - 9:18 pm
LHR
-
GTF
34h 38m
2 stops
$757United Airlines
Wed, Apr 15 - Fri, May 1
United Airlines Logo
2:30 pm - 9:35 pm
GTF
-
LHR
24h 05m
2 stops
United Airlines Logo
5:40 pm - 9:18 pm
LHR
-
GTF
34h 38m
2 stops
$758United Airlines
Sat, Apr 18 - Fri, May 1
United Airlines Logo
6:15 am - 4:40 pm
GTF
-
LHR
27h 25m
2 stops
United Airlines Logo
7:25 am - 1:34 pm
LHR
-
GTF
37h 09m
2 stops
$761United Airlines
Wed, Apr 22 - Wed, May 6
United Airlines Logo
2:30 pm - 12:20 pm
GTF
-
LHR
14h 50m
1 stop
United Airlines Logo
7:25 am - 9:18 pm
LHR
-
GTF
20h 53m
2 stops
$765United Airlines
Wed, Apr 22 - Wed, May 6
United Airlines Logo
6:15 am - 12:20 pm
GTF
-
LHR
23h 05m
1 stop
United Airlines Logo
2:50 pm - 9:18 pm
LHR
-
GTF
13h 28m
1 stop
$769United Airlines
Wed, Apr 15 - Fri, May 1

Delta flights from Great Falls to London

Our best Delta deals on Great Falls to London flight tickets
Delta
Apr 25
GTF6:20 pmGreat Falls
29h 00m
2 stops
LHR6:20 amLondon Heathrow
May 15
LHR6:30 amLondon Heathrow
18h 09m
2 stops
GTF5:39 pmGreat Falls
$865
Delta
Apr 25
GTF6:20 pmGreat Falls
29h 50m
2 stops
LHR7:10 amLondon Heathrow
May 13
LHR6:15 amLondon Heathrow
23h 11m
2 stops
GTF10:26 pmGreat Falls
$872
Delta
Apr 25
GTF6:20 pmGreat Falls
29h 00m
2 stops
LHR6:20 amLondon Heathrow
May 12
LHR5:35 pmLondon Heathrow
31h 04m
2 stops
GTF5:39 pmGreat Falls
$885

United Airlines flights from Great Falls to London

Our best United Airlines deals on Great Falls to London flight tickets
United Airlines
Apr 15
GTF6:15 amGreat Falls
23h 05m
1 stop
LHR12:20 pmLondon Heathrow
Apr 22
LHR10:50 amLondon Heathrow
33h 41m
2 stops
GTF1:31 pmGreat Falls
$741
United Airlines
Apr 15
GTF6:15 amGreat Falls
20h 45m
2 stops
LHR10:00 amLondon Heathrow
Apr 22
LHR10:50 amLondon Heathrow
33h 41m
2 stops
GTF1:31 pmGreat Falls
$744
United Airlines
May 2
GTF2:35 pmGreat Falls
36h 25m
2 stops
LHR10:00 amLondon Heathrow
May 12
LHR9:00 amLondon Heathrow
35h 34m
2 stops
GTF1:34 pmGreat Falls
$745

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated March 3, 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

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/15

6:15 am-12:20 pm

1 stop23h 05m

London Heathrow

Wed 4/22

10:50 am-1:31 pm

2 stops33h 41m

$741

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/15

6:15 am-10:00 am

2 stops20h 45m

London Heathrow

Wed 4/22

10:50 am-1:31 pm

2 stops33h 41m

$744

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 5/2

2:35 pm-10:00 am

2 stops36h 25m

London Heathrow

Tue 5/12

9:00 am-1:34 pm

2 stops35h 34m

$745

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/15

6:15 am-9:40 am

1 stop20h 25m

London Heathrow

Tue 5/5

4:25 pm-9:18 pm

2 stops35h 53m

$751

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/15

2:30 pm-12:20 pm

1 stop14h 50m

London Heathrow

Fri 5/1

5:40 pm-9:18 pm

2 stops34h 38m

$754

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/15

6:15 am-6:30 am

2 stops17h 15m

London Heathrow

Fri 5/1

5:40 pm-9:18 pm

2 stops34h 38m

$757

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 4/18

2:30 pm-9:35 pm

2 stops24h 05m

London Heathrow

Fri 5/1

5:40 pm-9:18 pm

2 stops34h 38m

$758

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/22

6:15 am-4:40 pm

2 stops27h 25m

London Heathrow

Wed 5/6

7:25 am-1:34 pm

2 stops37h 09m

$761

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/22

2:30 pm-12:20 pm

1 stop14h 50m

London Heathrow

Wed 5/6

7:25 am-9:18 pm

2 stops20h 53m

$765

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/15

6:15 am-12:20 pm

1 stop23h 05m

London Heathrow

Fri 5/1

2:50 pm-9:18 pm

1 stop13h 28m

$769

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

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

Which airport is the most popular layover for flights between Great Falls and London?

Percentage of 1-stop return trips between Great Falls and London selected by momondo users, with the same layover airport each way, over the last 12 months.

Salt Lake City (SLC) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Great Falls to London?

Average price of 1-stop round-trip flights from Great Falls to London, with the same layover airport on both legs, clicked by momondo users over the past 12 months.

Flights via Denver (DEN) offer the lowest average round-trip price of $697.

Which layover airport has the shortest travel time from Great Falls to London?

Average total travel time for 1-stop one-way flights from Great Falls to London, grouped by layover airport, based on momondo user clicks from the past 12 months.

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 12h 05m.

Which layover airport has the shortest connection time from Great Falls to London?

Average connection time for 1-stop one-way flights from Great Falls to London, grouped by layover airport, based on momondo user clicks over the last 12 months.

Denver (DEN) has the shortest average layover time for this route: 1h 33m.

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 round-trip 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

20h 25m

Direct flights

None
The fastest flight from Great Falls to London takes 20h 25m
There are no direct flights from Great Falls to London. There are no popular flight routes from Great Falls to London.
Search flight deals

  • How far is Great Falls to London by plane?

    The distance between Great Falls and London is about 4477.2 mi. 20h 25m is a normal flight duration for this route.

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

    Prices for flights from Great Falls Airport to London are updated daily.

  • How many operators does momondo search for flights from Great Falls Airport to London?

  • 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 travel and health documents you'll need for your trip to London 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. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Great Falls to London

Compare and see reviews for airlines that fly from Great Falls to London with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $645Free CancellationRating
7.4
9,382 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
Crawley
Hayes
Wembley
Dartford
Croydon
Brentwood
Harrow
Watford
Guildford
Stansted
Cobham
Folkestone
Romford
Richmond

Why use momondo?

Why should I use momondo to find a flight deal from Great Falls to London?

Finding the right flight to London from Great Falls is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

Can I find flights from Great Falls to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from Great Falls with this policy.

How can momondo help me find flights from Great Falls to London?

Once you have performed a search for Great Falls to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to London from Great Falls. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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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
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport