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Cheap flights from Idaho Falls to London from £646

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Idaho Falls to London departing on 18/8. 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 Idaho Falls to London

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
16:14 - 13:00
IDA
-
LHR
13h 46m
1 stop
Multiple Airlines Logo
08:15 - 21:20
LHR
-
IDA
20h 05m
2 stops
£646Multiple Airlines
Tue, 18 Aug - Tue, 25 Aug
American Airlines Logo
14:20 - 10:55
IDA
-
LHR
13h 35m
1 stop
American Airlines Logo
08:15 - 21:20
LHR
-
IDA
20h 05m
2 stops
£648American Airlines
Tue, 18 Aug - Tue, 25 Aug
KLM Logo
13:10 - 10:00
IDA
-
LHR
14h 50m
1 stop
KLM Logo
20:25 - 18:14
LHR
-
IDA
28h 49m
2 stops
£652KLM
Wed, 28 Oct - Wed, 4 Nov
KLM Logo
13:10 - 10:30
IDA
-
LHR
15h 20m
2 stops
KLM Logo
17:50 - 18:14
LHR
-
IDA
31h 24m
2 stops
£655KLM
Wed, 28 Oct - Wed, 4 Nov
United Airlines Logo
10:35 - 12:35
IDA
-
LHR
19h 00m
1 stop
United Airlines Logo
07:25 - 09:53
LHR
-
IDA
33h 28m
2 stops
£656United Airlines
Wed, 7 Oct - Tue, 13 Oct
United Airlines Logo
17:53 - 12:35
IDA
-
LHR
11h 42m
1 stop
United Airlines Logo
06:55 - 09:53
LHR
-
IDA
33h 58m
2 stops
£656United Airlines
Wed, 7 Oct - Tue, 13 Oct
Alaska Airlines Logo
13:46 - 12:20
IDA
-
LHR
16h 34m
1 stop
Alaska Airlines Logo
14:45 - 23:42
LHR
-
IDA
15h 57m
1 stop
£660Alaska Airlines
Wed, 28 Oct - Wed, 4 Nov
United Airlines Logo
17:53 - 20:40
IDA
-
LHR
19h 47m
2 stops
United Airlines Logo
07:30 - 17:16
LHR
-
IDA
16h 46m
2 stops
£664United Airlines
Sat, 12 Sep - Wed, 23 Sep
Multiple Airlines Logo
13:43 - 11:15
IDA
-
LHR
14h 32m
1 stop
Multiple Airlines Logo
12:55 - 21:22
LHR
-
IDA
15h 27m
1 stop
£673Multiple Airlines
Wed, 7 Oct - Tue, 13 Oct
Multiple Airlines Logo
13:43 - 11:15
IDA
-
LHR
14h 32m
1 stop
Multiple Airlines Logo
12:55 - 21:22
LHR
-
IDA
15h 27m
1 stop
£674Multiple Airlines
Wed, 7 Oct - Tue, 13 Oct

Delta flights from Idaho Falls to London

Our best Delta deals on Idaho Falls to London flight tickets
Delta
7 Oct
IDA06:00Idaho Falls Fanning Field
24h 05m
2 stops
LHR13:05London Heathrow
13 Oct
LHR06:30London Heathrow
22h 49m
2 stops
IDA22:19Idaho Falls Fanning Field
£706
Delta
7 Oct
IDA06:00Idaho Falls Fanning Field
18h 10m
2 stops
LHR07:10London Heathrow
13 Oct
LHR06:30London Heathrow
22h 49m
2 stops
IDA22:19Idaho Falls Fanning Field
£707
Delta
7 Oct
IDA06:00Idaho Falls Fanning Field
24h 05m
2 stops
LHR13:05London Heathrow
13 Oct
LHR06:30London Heathrow
22h 49m
2 stops
IDA22:19Idaho Falls Fanning Field
£708

United Airlines flights from Idaho Falls to London

Our best United Airlines deals on Idaho Falls to London flight tickets
United Airlines
7 Oct
IDA10:35Idaho Falls Fanning Field
19h 00m
1 stop
LHR12:35London Heathrow
13 Oct
LHR07:25London Heathrow
33h 28m
2 stops
IDA09:53Idaho Falls Fanning Field
£656
United Airlines
7 Oct
IDA17:53Idaho Falls Fanning Field
11h 42m
1 stop
LHR12:35London Heathrow
13 Oct
LHR06:55London Heathrow
33h 58m
2 stops
IDA09:53Idaho Falls Fanning Field
£656
United Airlines
12 Sept
IDA17:53Idaho Falls Fanning Field
19h 47m
2 stops
LHR20:40London Heathrow
23 Sept
LHR07:30London Heathrow
16h 46m
2 stops
IDA17:16Idaho Falls Fanning Field
£664

momondo Fare Finder

 
Customise your flight search to find flights from Idaho 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 279,928 searches. Data last updated 24 May 2026.
Use the filters below to find and compare flights from Idaho Falls to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 18/8

16:14-13:00

1 stop13h 46m

London Heathrow

Tue 25/8

08:15-21:20

2 stops20h 05m

£646

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 18/8

14:20-10:55

1 stop13h 35m

London Heathrow

Tue 25/8

08:15-21:20

2 stops20h 05m

£648

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 28/10

13:10-10:00

1 stop14h 50m

London Heathrow

Wed 4/11

20:25-18:14

2 stops28h 49m

£652

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 28/10

13:10-10:30

2 stops15h 20m

London Heathrow

Wed 4/11

17:50-18:14

2 stops31h 24m

£655

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

10:35-12:35

1 stop19h 00m

London Heathrow

Tue 13/10

07:25-09:53

2 stops33h 28m

£656

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

17:53-12:35

1 stop11h 42m

London Heathrow

Tue 13/10

06:55-09:53

2 stops33h 58m

£656

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 28/10

13:46-12:20

1 stop16h 34m

London Heathrow

Wed 4/11

14:45-23:42

1 stop15h 57m

£660

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sat 12/9

17:53-20:40

2 stops19h 47m

London Heathrow

Wed 23/9

07:30-17:16

2 stops16h 46m

£664
Fastest return journey

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:43-11:15

1 stop14h 32m

London Heathrow

Tue 13/10

12:55-21:22

1 stop15h 27m

£673

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:43-11:15

1 stop14h 32m

London Heathrow

Tue 13/10

12:55-21:22

1 stop15h 27m

£674

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

When to book flights from Idaho Falls to London

Are you open to changing your travel dates? Check out the ideal times to fly from Idaho Falls to London according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Idaho Falls to London (IDA to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Idaho Falls to London

Fastest flight time

11h 31m

Direct flights

None
The fastest flight from Idaho Falls to London takes 11h 31m
There are no direct flights from Idaho Falls to London. There are no popular flight routes from Idaho Falls to London.
Search flight deals

Frequently asked questions about flying from Idaho Falls to London

  • How far is Idaho Falls Fanning Field to London by plane?

    There are 4715.6 mi between Idaho Falls Fanning Field and London. By plane, this route typically takes 11h 31m.

  • When did momondo last update prices for flights from Idaho Falls Fanning Field Airport to London?

    Prices for flights from Idaho Falls Fanning Field Airport to London are refreshed on a daily basis.

  • How old do you have to be to fly from Idaho Falls Fanning Field Airport to London?

    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 Idaho Falls Fanning Field Airport to London.

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

    The necessary travel and health documents for your London 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.

Frequently asked questions about flying from Idaho Falls to London

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

    Confirm your travel details to search for the latest offers for flights from Idaho Falls to London. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Idaho Falls to London with momondo?

    By using tools like our “Price Calendar”, you can see the best days for return flights on 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.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Gatwick
Luton
Wembley
Slough
Maidstone
Southend-on-Sea
Ipswich
Canterbury
Ilford
Hayes
Guildford
Folkestone
Chelmsford
Bedford
Dover
Harlow
Chichester
Colchester

Why use momondo?

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

It is quick and easy to find Idaho Falls to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

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

All flight searches from Idaho Falls to London on momondo can be filtered to show those which offer flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Idaho Falls to London.

I’m not ready to book a flight from Idaho Falls 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 Idaho Falls and alert you when they change.

An easier way to manage your London trip

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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