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Cheap flights from Montana 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 Montana to London departing on 11/25. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Montana to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
5:51 pm - 6:35 pm-
17h 44m
United Airlines Logo
3:00 pm - 8:51 pm-
36h 51m
$756United Airlines
Sun, Dec 6 - Tue, Dec 8
United Airlines Logo
2:30 pm - 4:50 pm-
43h 20m
United Airlines Logo
11:35 am - 8:59 pm-
16h 24m
$783United Airlines
Mon, Dec 7 - Thu, Dec 10
United Airlines Logo
2:30 pm - 4:50 pm-
43h 20m
United Airlines Logo
11:10 am - 8:59 pm-
16h 49m
$791United Airlines
Mon, Dec 7 - Thu, Dec 10
Multiple Airlines Logo
7:00 am - 7:55 am-
17h 55m
Multiple Airlines Logo
7:30 am - 8:51 pm-
20h 21m
$813Multiple Airlines
Sun, Dec 6 - Tue, Dec 8
Multiple Airlines Logo
12:58 pm - 10:45 am-
14h 47m
Multiple Airlines Logo
10:45 am - 5:48 pm-
14h 03m
$815Multiple Airlines
Sun, Dec 6 - Tue, Dec 8
United Airlines Logo
10:15 am - 8:25 am-
39h 10m
United Airlines Logo
6:35 am - 10:43 pm-
23h 08m
$829United Airlines
Sun, Nov 15 - Wed, Nov 18
Multiple Airlines Logo
2:40 pm - 6:30 am-
32h 50m
Multiple Airlines Logo
11:10 am - 8:51 pm-
40h 41m
$866Multiple Airlines
Mon, Jan 11 - Wed, Jan 20
Delta Logo
5:33 am - 10:00 am-
21h 27m
Delta Logo
8:40 am - 7:57 pm-
18h 17m
$875Delta
Mon, Nov 16 - Thu, Nov 19
Delta Logo
5:33 am - 10:00 am-
21h 27m
Delta Logo
8:40 am - 7:57 pm-
18h 17m
$876Delta
Mon, Nov 16 - Thu, Nov 19
Delta Logo
5:33 am - 10:00 am-
21h 27m
Delta Logo
8:40 am - 7:57 pm-
18h 17m
$877Delta
Mon, Nov 16 - Thu, Nov 19

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KLM flights from Montana to London Heathrow Airport

Our best KLM deals on Montana to London Heathrow Airport flight tickets
KLM
Nov 3
GTF5:40 amGreat Falls
21h 20m
1 stop
LHR10:00 amLondon Heathrow
Nov 17
LHR5:50 pmLondon Heathrow
30h 51m
2 stops
GTF5:41 pmGreat Falls
$876
KLM
Nov 3
GTF5:40 amGreat Falls
18h 25m
2 stops
LHR7:05 amLondon Heathrow
Nov 17
LHR8:25 pmLondon Heathrow
28h 16m
2 stops
GTF5:41 pmGreat Falls
$880
KLM
Oct 20
MSO8:33 amMissoula Johnson-Bell Field
18h 47m
1 stop
LHR10:20 amLondon Heathrow
Oct 29
LHR6:30 amLondon Heathrow
19h 24m
2 stops
MSO7:54 pmMissoula Johnson-Bell Field
$904

SWISS flights from Montana to London Heathrow Airport

Our best SWISS deals on Montana to London Heathrow Airport flight tickets
SWISS
Nov 15
GTF6:30 amGreat Falls
18h 25m
2 stops
LHR7:55 amLondon Heathrow
Dec 9
LHR11:35 amLondon Heathrow
16h 45m
1 stop
GTF9:20 pmGreat Falls
$962
SWISS
Oct 22
MSO2:38 pmMissoula Johnson-Bell Field
12h 02m
1 stop
LHR9:40 amLondon Heathrow
Oct 30
LHR10:25 amLondon Heathrow
17h 22m
2 stops
MSO9:47 pmMissoula Johnson-Bell Field
$1,022

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 5, 2026.
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

Cheapest round-trip

BillingsLondon

BIL - LHR

BILLHR

Billings Logan Intl

Sun 12/6

5:51 pm-6:35 pm

2 stops17h 44m

London Heathrow

Tue 12/8

3:00 pm-8:51 pm

2 stops36h 51m

$756

HelenaLondon

HLN - LHR

HLNLHR

Helena

Mon 12/7

2:30 pm-4:50 pm

2 stops43h 20m

London Heathrow

Thu 12/10

11:35 am-8:59 pm

1 stop16h 24m

$783

HelenaLondon

HLN - LHR

HLNLHR

Helena

Mon 12/7

2:30 pm-4:50 pm

2 stops43h 20m

London Heathrow

Thu 12/10

11:10 am-8:59 pm

2 stops16h 49m

$791

BillingsLondon

BIL - LHR

BILLHR

Billings Logan Intl

Sun 12/6

7:00 am-7:55 am

2 stops17h 55m

London Heathrow

Tue 12/8

7:30 am-8:51 pm

2 stops20h 21m

$813
Quickest round-trip

BillingsLondon

BIL - LHR

BILLHR

Billings Logan Intl

Sun 12/6

12:58 pm-10:45 am

2 stops14h 47m

London Heathrow

Tue 12/8

10:45 am-5:48 pm

1 stop14h 03m

$815

ButteLondon

BTM - LHR

BTMLHR

Butte Silver Bow Co

Sun 11/15

10:15 am-8:25 am

2 stops39h 10m

London Heathrow

Wed 11/18

6:35 am-10:43 pm

2 stops23h 08m

$829

BillingsLondon

BIL - LHR

BILLHR

Billings Logan Intl

Mon 1/11

2:40 pm-6:30 am

2 stops32h 50m

London Heathrow

Wed 1/20

11:10 am-8:51 pm

2 stops40h 41m

$866

MissoulaLondon

MSO - LHR

MSOLHR

Missoula Johnson-Bell Field

Mon 11/16

5:33 am-10:00 am

1 stop21h 27m

London Heathrow

Thu 11/19

8:40 am-7:57 pm

2 stops18h 17m

$875

MissoulaLondon

MSO - LHR

MSOLHR

Missoula Johnson-Bell Field

Mon 11/16

5:33 am-10:00 am

1 stop21h 27m

London Heathrow

Thu 11/19

8:40 am-7:57 pm

2 stops18h 17m

$876

MissoulaLondon

MSO - LHR

MSOLHR

Missoula Johnson-Bell Field

Mon 11/16

5:33 am-10:00 am

1 stop21h 27m

London Heathrow

Thu 11/19

8:40 am-7:57 pm

2 stops18h 17m

$877

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 $0. If you’re not able to fly to London Heathrow Airport in February, then September is your next best option. Flight prices from Montana to London Heathrow Airport during September average around $799.

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

You could potentially save up to 1% 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

Fastest flight time

12h 15m

Direct flights

None
The fastest flight from Montana to London Heathrow Airport takes 12h 15m
There are no direct flights from Montana to London Heathrow Airport. There are no popular flight routes from Montana to London Heathrow Airport.
Search flight deals

Frequently asked questions about flying from Montana to London Heathrow Airport

  • 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 $556Free CancellationRating
7.4
10,058 reviews
Search United Airlines flights
DeltaPriceFrom $604Free CancellationRating
7.8
8,491 reviews
Search Delta flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Hayes
Wembley
Dover
Croydon
Stansted
Stratford-upon-Avon
Kingston upon Thames
Slough
Harrow
Watford
Cobham
Richmond
Uxbridge
Worthing
Romford
Ilford

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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