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Cheap flights from Idaho Falls to London from £344

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Idaho Falls to London departing on 1/9. 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
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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.
Alaska Airlines Logo
06:15 - 12:20
IDA
-
LHR
23h 05m
1 stop
Alaska Airlines Logo
14:45 - 22:39
LHR
-
IDA
14h 54m
1 stop
£659Alaska Airlines
Tue, 8 Dec - Tue, 15 Dec
Multiple Airlines Logo
13:46 - 13:45
IDA
-
LHR
16h 59m
1 stop
Multiple Airlines Logo
08:15 - 21:42
LHR
-
IDA
20h 27m
2 stops
£667Multiple Airlines
Wed, 7 Oct - Tue, 13 Oct
KLM Logo
06:00 - 10:00
IDA
-
LHR
21h 00m
1 stop
KLM Logo
20:25 - 18:14
LHR
-
IDA
28h 49m
2 stops
£672KLM
Wed, 11 Nov - Wed, 18 Nov
Multiple Airlines Logo
13:10 - 13:45
IDA
-
LHR
17h 35m
2 stops
Multiple Airlines Logo
17:50 - 18:14
LHR
-
IDA
31h 24m
2 stops
£675Multiple Airlines
Wed, 11 Nov - Wed, 18 Nov
American Airlines Logo
13:39 - 10:55
IDA
-
LHR
14h 16m
1 stop
American Airlines Logo
12:55 - 21:42
LHR
-
IDA
15h 47m
1 stop
£694American Airlines
Wed, 7 Oct - Tue, 13 Oct
Lufthansa Logo
14:35 - 09:40
IDA
-
LHR
12h 05m
1 stop
Lufthansa Logo
07:30 - 21:08
LHR
-
IDA
20h 38m
2 stops
£696Lufthansa
Tue, 8 Dec - Tue, 15 Dec
United Airlines Logo
10:35 - 11:35
IDA
-
LHR
18h 00m
2 stops
United Airlines Logo
09:30 - 17:16
LHR
-
IDA
38h 46m
2 stops
£699United Airlines
Wed, 7 Oct - Tue, 13 Oct
Lufthansa Logo
10:45 - 10:50
IDA
-
LHR
17h 05m
2 stops
Lufthansa Logo
07:30 - 17:22
LHR
-
IDA
16h 52m
2 stops
£699Lufthansa
Tue, 8 Dec - Tue, 15 Dec
Alaska Airlines Logo
13:46 - 15:05
IDA
-
LHR
18h 19m
1 stop
Alaska Airlines Logo
14:45 - 15:17
LHR
-
IDA
31h 32m
1 stop
£700Alaska Airlines
Fri, 16 Oct - Tue, 3 Nov
Lufthansa Logo
10:45 - 10:50
IDA
-
LHR
17h 05m
2 stops
Lufthansa Logo
07:30 - 17:22
LHR
-
IDA
16h 52m
2 stops
£701Lufthansa
Tue, 8 Dec - Tue, 15 Dec

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Delta flights from Idaho Falls to London

Our best Delta deals on Idaho Falls to London flight tickets
Delta
4 Sept
IDA15:17Idaho Falls Fanning Field
17h 18m
2 stops
LHR15:35London Heathrow
11 Sept
LHR06:30London Heathrow
18h 47m
2 stops
IDA18:17Idaho Falls Fanning Field
£760
Delta
5 Sept
IDA06:00Idaho Falls Fanning Field
18h 10m
2 stops
LHR07:10London Heathrow
12 Sept
LHR10:55London Heathrow
18h 27m
1 stop
IDA22:22Idaho Falls Fanning Field
£819
Delta
4 Sept
IDA15:17Idaho Falls Fanning Field
11h 43m
1 stop
LHR10:00London Heathrow
12 Sept
LHR10:55London Heathrow
18h 27m
1 stop
IDA22:22Idaho Falls Fanning Field
£877

Alaska Airlines flights from Idaho Falls to London

Our best Alaska Airlines deals on Idaho Falls to London flight tickets
Alaska Airlines
8 Dec
IDA06:15Idaho Falls Fanning Field
23h 05m
1 stop
LHR12:20London Heathrow
15 Dec
LHR14:45London Heathrow
14h 54m
1 stop
IDA22:39Idaho Falls Fanning Field
£659
Alaska Airlines
16 Oct
IDA13:46Idaho Falls Fanning Field
18h 19m
1 stop
LHR15:05London Heathrow
3 Nov
LHR14:45London Heathrow
31h 32m
1 stop
IDA15:17Idaho Falls Fanning Field
£700
Alaska Airlines
6 Sept
IDA06:18Idaho Falls Fanning Field
25h 47m
1 stop
LHR15:05London Heathrow
10 Sept
LHR17:00London Heathrow
29h 20m
1 stop
IDA15:20Idaho Falls Fanning Field
£800

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 15 July 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 8/12

06:15-12:20

1 stop23h 05m

London Heathrow

Tue 15/12

14:45-22:39

1 stop14h 54m

£659

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:46-13:45

1 stop16h 59m

London Heathrow

Tue 13/10

08:15-21:42

2 stops20h 27m

£667

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 11/11

06:00-10:00

1 stop21h 00m

London Heathrow

Wed 18/11

20:25-18:14

2 stops28h 49m

£672

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 11/11

13:10-13:45

2 stops17h 35m

London Heathrow

Wed 18/11

17:50-18:14

2 stops31h 24m

£675
Fastest return journey

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:39-10:55

1 stop14h 16m

London Heathrow

Tue 13/10

12:55-21:42

1 stop15h 47m

£694

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 8/12

14:35-09:40

1 stop12h 05m

London Heathrow

Tue 15/12

07:30-21:08

2 stops20h 38m

£696

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

10:35-11:35

2 stops18h 00m

London Heathrow

Tue 13/10

09:30-17:16

2 stops38h 46m

£699

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 8/12

10:45-10:50

2 stops17h 05m

London Heathrow

Tue 15/12

07:30-17:22

2 stops16h 52m

£699

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 16/10

13:46-15:05

1 stop18h 19m

London Heathrow

Tue 3/11

14:45-15:17

1 stop31h 32m

£700

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 8/12

10:45-10:50

2 stops17h 05m

London Heathrow

Tue 15/12

07:30-17:22

2 stops16h 52m

£701

Flights are sorted by cheapest return flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Idaho Falls to London

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 airline that flies from Idaho Falls Fanning Field to London?

United Airlines is the most popular carrier operating from Idaho Falls Fanning Field to London

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

13h 21m

Direct flights

None
The fastest flight from Idaho Falls to London takes 13h 21m
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 13h 21m.

  • 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.

Travelling to a place near London?

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

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.

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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