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Cheap flights from Great Falls to the United Kingdom from $399

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Great Falls to the United Kingdom departing on 3/22. 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 the United Kingdom

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:25 am - 9:40 am
GTF
-
LHR
20h 15m
1 stop
United Airlines Logo
6:35 am - 9:11 pm
LHR
-
GTF
20h 36m
2 stops
$635United Airlines
Sat, Feb 28 - Thu, Mar 12
Delta Logo
6:20 pm - 10:00 am
GTF
-
LHR
32h 40m
1 stop
Delta Logo
11:45 am - 5:42 pm
LHR
-
GTF
35h 57m
2 stops
$636Delta
Sun, Mar 1 - Wed, Mar 11
Delta Logo
6:20 pm - 10:00 am
GTF
-
LHR
32h 40m
1 stop
Delta Logo
6:20 am - 10:30 pm
LHR
-
GTF
22h 10m
2 stops
$641Delta
Sun, Mar 1 - Tue, Mar 10
United Airlines Logo
2:25 pm - 10:55 pm
GTF
-
LHR
25h 30m
2 stops
United Airlines Logo
6:35 am - 9:11 pm
LHR
-
GTF
20h 36m
2 stops
$644United Airlines
Mon, Mar 2 - Thu, Mar 12
Delta Logo
1:15 pm - 4:50 pm
GTF
-
LHR
20h 35m
2 stops
Delta Logo
6:20 am - 10:30 pm
LHR
-
GTF
22h 10m
2 stops
$646Delta
Tue, Mar 3 - Tue, Mar 10
Delta Logo
1:15 pm - 1:50 pm
GTF
-
LHR
17h 35m
2 stops
Delta Logo
11:45 am - 5:42 pm
LHR
-
GTF
35h 57m
2 stops
$647Delta
Mon, Mar 2 - Mon, Mar 16
United Airlines Logo
2:30 pm - 9:40 am
GTF
-
LHR
12h 10m
1 stop
United Airlines Logo
1:00 pm - 9:11 pm
LHR
-
GTF
38h 11m
2 stops
$649United Airlines
Thu, Mar 5 - Mon, Mar 16
Delta Logo
6:20 pm - 6:50 am
GTF
-
LHR
29h 30m
2 stops
Delta Logo
6:20 am - 5:42 pm
LHR
-
GTF
17h 22m
2 stops
$651Delta
Sun, Mar 1 - Fri, Mar 13
United Airlines Logo
6:15 am - 10:00 am
GTF
-
LHR
20h 45m
2 stops
United Airlines Logo
7:25 am - 1:34 pm
LHR
-
GTF
37h 09m
2 stops
$655United Airlines
Wed, Apr 15 - Wed, Apr 29
Multiple Airlines Logo
1:09 pm - 3:35 pm
GTF
-
LHR
19h 26m
2 stops
Multiple Airlines Logo
9:55 am - 10:44 pm
LHR
-
GTF
19h 49m
2 stops
$656Multiple Airlines
Tue, Apr 28 - Wed, May 13

United Airlines flights from Great Falls to United Kingdom

Our best United Airlines deals on Great Falls to United Kingdom flight tickets
United Airlines
Feb 28
GTF6:25 amGreat Falls
20h 15m
1 stop
LHR9:40 amLondon Heathrow
Mar 12
LHR6:35 amLondon Heathrow
20h 36m
2 stops
GTF9:11 pmGreat Falls
$635
United Airlines
Mar 2
GTF2:25 pmGreat Falls
25h 30m
2 stops
LHR10:55 pmLondon Heathrow
Mar 12
LHR6:35 amLondon Heathrow
20h 36m
2 stops
GTF9:11 pmGreat Falls
$644
United Airlines
Mar 5
GTF2:30 pmGreat Falls
12h 10m
1 stop
LHR9:40 amLondon Heathrow
Mar 16
LHR1:00 pmLondon Heathrow
38h 11m
2 stops
GTF9:11 pmGreat Falls
$649

Delta flights from Great Falls to United Kingdom

Our best Delta deals on Great Falls to United Kingdom flight tickets
Delta
Mar 1
GTF6:20 pmGreat Falls
32h 40m
1 stop
LHR10:00 amLondon Heathrow
Mar 11
LHR11:45 amLondon Heathrow
35h 57m
2 stops
GTF5:42 pmGreat Falls
$636
Delta
Mar 1
GTF6:20 pmGreat Falls
32h 40m
1 stop
LHR10:00 amLondon Heathrow
Mar 10
LHR6:20 amLondon Heathrow
22h 10m
2 stops
GTF10:30 pmGreat Falls
$641
Delta
Mar 3
GTF1:15 pmGreat Falls
20h 35m
2 stops
LHR4:50 pmLondon Heathrow
Mar 10
LHR6:20 amLondon Heathrow
22h 10m
2 stops
GTF10:30 pmGreat Falls
$646

momondo Fare Finder

 
Customize your flight search to find flights from Great Falls to United Kingdom 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 February 2, 2026.
Use the filters below to find and compare flights from Great Falls to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sat 2/28

6:25 am-9:40 am

1 stop20h 15m

London Heathrow

Thu 3/12

6:35 am-9:11 pm

2 stops20h 36m

$635

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 3/1

6:20 pm-10:00 am

1 stop32h 40m

London Heathrow

Wed 3/11

11:45 am-5:42 pm

2 stops35h 57m

$636

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 3/1

6:20 pm-10:00 am

1 stop32h 40m

London Heathrow

Tue 3/10

6:20 am-10:30 pm

2 stops22h 10m

$641

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 3/2

2:25 pm-10:55 pm

2 stops25h 30m

London Heathrow

Thu 3/12

6:35 am-9:11 pm

2 stops20h 36m

$644

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Tue 3/3

1:15 pm-4:50 pm

2 stops20h 35m

London Heathrow

Tue 3/10

6:20 am-10:30 pm

2 stops22h 10m

$646

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 3/2

1:15 pm-1:50 pm

2 stops17h 35m

London Heathrow

Mon 3/16

11:45 am-5:42 pm

2 stops35h 57m

$647

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Thu 3/5

2:30 pm-9:40 am

1 stop12h 10m

London Heathrow

Mon 3/16

1:00 pm-9:11 pm

2 stops38h 11m

$649

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 3/1

6:20 pm-6:50 am

2 stops29h 30m

London Heathrow

Fri 3/13

6:20 am-5:42 pm

2 stops17h 22m

$651

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 4/15

6:15 am-10:00 am

2 stops20h 45m

London Heathrow

Wed 4/29

7:25 am-1:34 pm

2 stops37h 09m

$655

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Tue 4/28

1:09 pm-3:35 pm

2 stops19h 26m

London Heathrow

Wed 5/13

9:55 am-10:44 pm

2 stops19h 49m

$656

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to the United Kingdom from

How to get the cheapest flight ticket from Great Falls to United Kingdom

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

Can stopping save me money on Great Falls to United Kingdom flights?

You could potentially save up to 44% on your flight if you consider stops on a Great Falls to United Kingdom flight.

Cheap Great Falls to United Kingdom flight deals and tips

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

Fastest flight time

12h 05m

Direct flights

None
The fastest flight from Great Falls to United Kingdom takes 12h 05m
There are no direct flights from Great Falls to United Kingdom. There are no popular flight routes from Great Falls to United Kingdom.
Search flight deals

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

    Prices for flights from Great Falls Airport to United Kingdom were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Great Falls Airport to United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The necessary travel and health documents for your United Kingdom trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Great Falls to United Kingdom

Compare and see reviews for airlines that fly from Great Falls to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $645Free CancellationRating
7.4
9,229 reviews
Search United Airlines flights
DeltaPriceFrom $764Free CancellationRating
7.9
8,132 reviews
Search Delta flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to United Kingdom from Great Falls.

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

Flights from Great Falls to United Kingdom with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once all potential Great Falls to United Kingdom 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 United Kingdom right now. Can momondo alert me if prices change?

Price alerts on flights to United Kingdom from Great Falls are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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