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Cheap flights from Montana to London from $327

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montana to London departing on 9/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Montana to London

Cheap round-trip flights

Delta Logo
1:05 pm - 9:50 amGTF-LHR
13h 45m1 stop
Delta Logo
6:30 am - 5:29 pmLHR-GTF
17h 59m2 stops
$577Delta
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Mon, Sep 29 - Wed, Oct 8
KLM Logo
1:05 pm - 9:50 amGTF-LHR
13h 45m1 stop
KLM Logo
6:30 am - 5:29 pmLHR-GTF
17h 59m2 stops
$578KLM
Find Deal
Mon, Sep 29 - Wed, Oct 8
Logo
2:42 pm - 1:10 pmFCA-LHR
15h 28m1 stop
Logo
6:20 am - 5:28 pmLHR-FCA
17h 08m2 stops
$581
Find Deal
Mon, Oct 13 - Thu, Oct 30
Logo
8:00 am - 1:10 pmMSO-LHR
22h 10m1 stop
Logo
6:20 am - 5:40 pmLHR-MSO
17h 20m2 stops
$581
Find Deal
Wed, Oct 22 - Wed, Oct 29
Air France Logo
8:00 am - 6:45 amMSO-LHR
15h 45m2 stops
Air France Logo
6:20 am - 5:40 pmLHR-MSO
17h 20m2 stops
$585Air France
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Wed, Oct 22 - Wed, Oct 29
Virgin Atlantic Logo
2:42 pm - 1:10 pmFCA-LHR
15h 28m1 stop
Virgin Atlantic Logo
10:45 am - 11:09 pmLHR-FCA
18h 24m1 stop
$588Virgin Atlantic
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Mon, Oct 13 - Thu, Oct 30
Virgin Atlantic Logo
1:05 pm - 2:15 pmMSO-LHR
18h 10m2 stops
Virgin Atlantic Logo
10:55 am - 12:17 amLHR-MSO
20h 22m1 stop
$593Virgin Atlantic
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Wed, Oct 1 - Thu, Oct 9
United Airlines Logo
7:00 am - 9:35 amBZN-LHR
19h 35m2 stops
United Airlines Logo
5:40 pm - 3:20 pmLHR-BZN
28h 40m2 stops
$632United Airlines
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Tue, Oct 7 - Thu, Oct 16
United Airlines Logo
6:30 am - 12:20 pmHLN-LHR
22h 50m1 stop
United Airlines Logo
3:50 pm - 4:40 pmLHR-HLN
31h 50m2 stops
$632United Airlines
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Tue, Oct 7 - Tue, Oct 14
Air France Logo
1:00 pm - 2:15 pmHLN-LHR
18h 15m2 stops
Air France Logo
10:55 am - 10:16 pmLHR-HLN
18h 21m1 stop
$693Air France
Find Deal
Thu, Oct 9 - Sun, Oct 12

Delta flights from Montana to London Heathrow Airport

Our best Delta deals on Montana to London Heathrow Airport flight tickets
Delta
Sep 29
GTF1:05 pmGreat Falls
13h 45m
1 stop
LHR9:50 amLondon Heathrow
Oct 8
LHR6:30 amLondon Heathrow
17h 59m
2 stops
GTF5:29 pmGreat Falls
$577
Find similar
Delta
Sep 29
GTF6:11 pmGreat Falls
29h 14m
2 stops
LHR6:25 amLondon Heathrow
Oct 8
LHR6:30 amLondon Heathrow
17h 59m
2 stops
GTF5:29 pmGreat Falls
$581
Find similar
Delta
Aug 25
HLN1:00 pmHelena
13h 50m
1 stop
LHR9:50 amLondon Heathrow
Sep 2
LHR6:30 amLondon Heathrow
22h 43m
2 stops
HLN10:13 pmHelena
$582
Find similar

United Airlines flights from Montana to London Heathrow Airport

Our best United Airlines deals on Montana to London Heathrow Airport flight tickets
United Airlines
Oct 7
BZN7:00 amBozeman Gallatin Field
19h 35m
2 stops
LHR9:35 amLondon Heathrow
Oct 16
LHR5:40 pmLondon Heathrow
28h 40m
2 stops
BZN3:20 pmBozeman Gallatin Field
$632
Find similar
United Airlines
Oct 8
BZN8:00 amBozeman Gallatin Field
15h 55m
2 stops
LHR6:55 amLondon Heathrow
Oct 16
LHR5:40 pmLondon Heathrow
28h 40m
2 stops
BZN3:20 pmBozeman Gallatin Field
$636
Find similar
United Airlines
Sep 30
GTF7:00 amGreat Falls
19h 40m
1 stop
LHR9:40 amLondon Heathrow
Oct 8
LHR2:50 pmLondon Heathrow
29h 36m
1 stop
GTF1:26 pmGreat Falls
$644
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Montana 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 August 7, 2025.
Use the filters below to find and compare flights from Montana to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 9/29

1:05 pm-9:50 am

1 stop13h 45m

London Heathrow

Wed 10/8

6:30 am-5:29 pm

2 stops17h 59m

$577

Great FallsLondon

GTF - LHR

GTFLHR

Great Falls

Mon 9/29

1:05 pm-9:50 am

1 stop13h 45m

London Heathrow

Wed 10/8

6:30 am-5:29 pm

2 stops17h 59m

$578

KalispellLondon

FCA - LHR

FCALHR

Kalispell Glacier Park

Mon 10/13

2:42 pm-1:10 pm

1 stop15h 28m

London Heathrow

Thu 10/30

6:20 am-5:28 pm

2 stops17h 08m

$581

MissoulaLondon

MSO - LHR

MSOLHR

Missoula Johnson-Bell Field

Wed 10/22

8:00 am-1:10 pm

1 stop22h 10m

London Heathrow

Wed 10/29

6:20 am-5:40 pm

2 stops17h 20m

$581

MissoulaLondon

MSO - LHR

MSOLHR

Missoula Johnson-Bell Field

Wed 10/22

8:00 am-6:45 am

2 stops15h 45m

London Heathrow

Wed 10/29

6:20 am-5:40 pm

2 stops17h 20m

$585

KalispellLondon

FCA - LHR

FCALHR

Kalispell Glacier Park

Mon 10/13

2:42 pm-1:10 pm

1 stop15h 28m

London Heathrow

Thu 10/30

10:45 am-11:09 pm

1 stop18h 24m

$588

MissoulaLondon

MSO - LHR

MSOLHR

Missoula Johnson-Bell Field

Wed 10/1

1:05 pm-2:15 pm

2 stops18h 10m

London Heathrow

Thu 10/9

10:55 am-12:17 am

1 stop20h 22m

$593

BozemanLondon

BZN - LHR

BZNLHR

Bozeman Gallatin Field

Tue 10/7

7:00 am-9:35 am

2 stops19h 35m

London Heathrow

Thu 10/16

5:40 pm-3:20 pm

2 stops28h 40m

$632

HelenaLondon

HLN - LHR

HLNLHR

Helena

Tue 10/7

6:30 am-12:20 pm

1 stop22h 50m

London Heathrow

Tue 10/14

3:50 pm-4:40 pm

2 stops31h 50m

$632

HelenaLondon

HLN - LHR

HLNLHR

Helena

Thu 10/9

1:00 pm-2:15 pm

2 stops18h 15m

London Heathrow

Sun 10/12

10:55 am-10:16 pm

1 stop18h 21m

$693

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Montana to London Heathrow Airport

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

What is the cheapest month to fly to London Heathrow Airport?

The month of February is, on average, the cheapest month to fly to London Heathrow Airport from Montana, with most prices found around $713. If you’re not able to fly to London Heathrow Airport in February, then January is your next best option. Flight prices from Montana to London Heathrow Airport during January average around $729.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $716. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,069.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is at noon. momondo users have found flights departing from Montana to London Heathrow Airport at noon for as low as $790. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $852.

Can stopping save me money on Montana to London Heathrow Airport flights?

You could potentially save up to 35% on your flight if you consider stops on a Montana to London Heathrow Airport flight.

Cheap Montana to London Heathrow Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montana to London Heathrow Airport

Best Price Found

$327

Fastest flight time

11h 55m

Direct flights

None
The best one-way flight to London Heathrow Airport from Montana in the past 72 hours is $327. The best round-trip flight deal from Montana to London Heathrow Airport found on momondo in the last 72 hours is $577.
The fastest flight from Montana to London Heathrow Airport takes 11h 55m
There are no direct flights from Montana to London Heathrow Airport. Popular non-direct routes for this connection are Bozeman Gallatin Field Airport - London Heathrow Airport, Great Falls Airport - London Heathrow Airport and Kalispell Glacier Park Airport - London Heathrow Airport.
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  • When did momondo last update prices for flights from Montana to London Heathrow Airport?

    Prices for flights from Montana to London Heathrow Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Montana to London Heathrow Airport?

  • How old do you have to be to fly from Montana 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 Montana to London Heathrow Airport.

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

    The travel and health documents required for your trip to London Heathrow Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Montana to London Heathrow Airport

Compare and see reviews for airlines that fly from Montana to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $645Free CancellationRating
7.4
8,917 reviews
Search United Airlines flights
DeltaPriceFrom $740Free CancellationRating
8.0
7,985 reviews
Search Delta flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Dover
Slough
Luton
Guildford
Milton Keynes
Dartford
Crawley
Hayes
Chelmsford
Stansted
Salisbury
Ilford
Brentwood
Colchester
Stratford-upon-Avon
Folkestone
Swindon
Watford

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Montana to London for you.

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

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

How can momondo help me find flights from Montana to London?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Montana.

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

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Montana and alert you when they change.

An easier way to manage your London Heathrow Airport trip

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