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

Price Alerts will notify you by email when the price for flights to London 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 with momondo?

By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

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.

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?

There is 1 operator available for flights from Great Falls Airport to London as of June 2026.

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.

$756 Cheap Flights from Great Falls to London in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Great Falls to London

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:15 am - 6:40 am

GTF

LHR

17h 25m

2 stops

6:35 am - 10:30 pm

LHR

GTF

22h 55m

2 stops

$756United Airlines

Wed, Nov 11 - Fri, Nov 13

2:25 pm - 11:05 am

GTF

LHR

37h 40m

2 stops

7:30 am - 9:20 pm

LHR

GTF

20h 50m

2 stops

$771United Airlines

Sun, Dec 6 - Wed, Dec 9

2:25 pm - 11:05 am

GTF

LHR

37h 40m

2 stops

7:30 am - 9:20 pm

LHR

GTF

20h 50m

2 stops

$772United Airlines

Sun, Dec 6 - Wed, Dec 9

2:25 pm - 4:50 pm

GTF

LHR

43h 25m

2 stops

11:35 am - 1:29 pm

LHR

GTF

32h 54m

1 stop

$780United Airlines

Sun, Dec 6 - Wed, Dec 9

2:25 pm - 9:40 am

GTF

LHR

12h 15m

1 stop

6:35 am - 10:30 pm

LHR

GTF

22h 55m

2 stops

$834United Airlines

Wed, Nov 11 - Fri, Nov 13

4:55 pm - 12:20 pm

GTF

LHR

12h 25m

1 stop

2:45 pm - 4:13 pm

LHR

GTF

32h 28m

1 stop

$888Alaska Airlines

Sun, Dec 6 - Wed, Dec 9

4:57 pm - 12:20 pm

GTF

LHR

12h 23m

1 stop

2:45 pm - 4:17 pm

LHR

GTF

32h 32m

1 stop

$889Alaska Airlines

Wed, Nov 11 - Fri, Nov 13

4:57 pm - 12:20 pm

GTF

LHR

12h 23m

1 stop

2:45 pm - 4:17 pm

LHR

GTF

32h 32m

1 stop

$890Alaska Airlines

Wed, Nov 11 - Fri, Nov 13

4:57 pm - 12:20 pm

GTF

LHR

12h 23m

1 stop

2:55 pm - 4:17 pm

LHR

GTF

32h 22m

1 stop

$907Multiple Airlines

Wed, Nov 11 - Fri, Nov 13

1:08 pm - 3:35 pm

GTF

LHR

19h 27m

2 stops

6:30 am - 5:42 pm

LHR

GTF

18h 12m

2 stops

$926Delta

Wed, Aug 26 - Thu, Sep 3

Save money when you book flights with momondo

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Alaska Airlines flights from Great Falls to London

Our best Alaska Airlines deals on Great Falls to London flight tickets

Alaska Airlines

Dec 6

GTF4:55 pmGreat Falls

12h 25m

1 stop

LHR12:20 pmLondon Heathrow

Dec 9

LHR2:45 pmLondon Heathrow

32h 28m

1 stop

GTF4:13 pmGreat Falls

$888

Alaska Airlines

Nov 11

GTF4:57 pmGreat Falls

12h 23m

1 stop

LHR12:20 pmLondon Heathrow

Nov 13

LHR2:45 pmLondon Heathrow

32h 32m

1 stop

GTF4:17 pmGreat Falls

$889

United Airlines flights from Great Falls to London

Our best United Airlines deals on Great Falls to London flight tickets

United Airlines

Nov 11

GTF6:15 amGreat Falls

17h 25m

2 stops

LHR6:40 amLondon Heathrow

Nov 13

LHR6:35 amLondon Heathrow

22h 55m

2 stops

GTF10:30 pmGreat Falls

$756

United Airlines

Dec 6

GTF2:25 pmGreat Falls

37h 40m

2 stops

LHR11:05 amLondon Heathrow

Dec 9

LHR7:30 amLondon Heathrow

20h 50m

2 stops

GTF9:20 pmGreat Falls

$771

United Airlines

Dec 6

GTF2:25 pmGreat Falls

37h 40m

2 stops

LHR11:05 amLondon Heathrow

Dec 9

LHR7:30 amLondon Heathrow

20h 50m

2 stops

GTF9:20 pmGreat Falls

$772

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 11/11

6:15 am-6:40 am

2 stops17h 25m

London Heathrow

Fri 11/13

6:35 am-10:30 pm

2 stops22h 55m

$756

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 12/6

2:25 pm-11:05 am

2 stops37h 40m

London Heathrow

Wed 12/9

7:30 am-9:20 pm

2 stops20h 50m

$771

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 12/6

2:25 pm-11:05 am

2 stops37h 40m

London Heathrow

Wed 12/9

7:30 am-9:20 pm

2 stops20h 50m

$772

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 12/6

2:25 pm-4:50 pm

2 stops43h 25m

London Heathrow

Wed 12/9

11:35 am-1:29 pm

1 stop32h 54m

$780

Quickest round-trip

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 11/11

2:25 pm-9:40 am

1 stop12h 15m

London Heathrow

Fri 11/13

6:35 am-10:30 pm

2 stops22h 55m

$834

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Sun 12/6

4:55 pm-12:20 pm

1 stop12h 25m

London Heathrow

Wed 12/9

2:45 pm-4:13 pm

1 stop32h 28m

$888

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 11/11

4:57 pm-12:20 pm

1 stop12h 23m

London Heathrow

Fri 11/13

2:45 pm-4:17 pm

1 stop32h 32m

$889

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 11/11

4:57 pm-12:20 pm

1 stop12h 23m

London Heathrow

Fri 11/13

2:45 pm-4:17 pm

1 stop32h 32m

$890

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 11/11

4:57 pm-12:20 pm

1 stop12h 23m

London Heathrow

Fri 11/13

2:55 pm-4:17 pm

1 stop32h 22m

$907

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Wed 8/26

1:08 pm-3:35 pm

2 stops19h 27m

London Heathrow

Thu 9/3

6:30 am-5:42 pm

2 stops18h 12m

$926

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted 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 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	16h 25m
Direct flights	None

The fastest flight from Great Falls to London takes 16h 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

Frequently asked questions about flying from Great Falls to London

How far is Great Falls to London by plane?
The distance between Great Falls and London is about 4477.2 mi. 16h 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?
There is 1 operator available for flights from Great Falls Airport to London as of June 2026.
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 Airlines	PriceFrom $645	Free Cancellation	Rating 7.4 9,804 reviews		Search United Airlines flights

Frequently asked questions about flying from Great Falls to London

How do I get Price Alerts for flights from Great Falls to London?
Price Alerts will notify you by email when the price for flights to London 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 with momondo?
By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.
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.

Hounslow

Gatwick

Milton Keynes

Luton

Dover

Hayes

Crawley

Croydon

Wembley

Stansted

Harrow

Slough

Brentwood

Watford

Cobham

Guildford

Folkestone

Uxbridge

Romford

Chelmsford

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

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Find better results for your trip to the United Kingdom

Nearby airports

Airlines

Cabin classes

Other United Kingdom destinations

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Complete your trip

Feeling lucky

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Cheap flights from Great Falls to London from $334

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 London departing on 10/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Great Falls to London

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Cheap one-way flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Alaska Airlines flights from Great Falls to London

Our best Alaska Airlines deals on Great Falls to London flight tickets

United Airlines flights from Great Falls to London

Our best United Airlines deals on Great Falls to London flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Great Falls to London that are best for you.

When to book flights from Great Falls to London

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

Direct flights

Frequently asked questions about flying from Great Falls to London

Best airlines flying from Great Falls to London

Compare and see reviews for airlines that fly from Great Falls to London with momondo

Frequently asked questions about flying from Great Falls to London

Traveling to a place near London?

Why use momondo?

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

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

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Great Falls

According to popular flight searches on momondo this year

Complete your trip to London

Explore popular destinations other users love

According to popular flight searches on momondo this year