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Cheap flights from Idaho Falls to London from £641

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 6/9. 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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Cheap return flights

Enter your travel dates to find the best prices.
American Airlines Logo
12:46 - 11:15
IDA
-
LHR
15h 29m
1 stop
American Airlines Logo
08:55 - 21:22
LHR
-
IDA
19h 27m
1 stop
£641American Airlines
Sun, 6 Sep - Sat, 12 Sep
American Airlines Logo
12:46 - 11:15
IDA
-
LHR
15h 29m
1 stop
American Airlines Logo
10:05 - 21:22
LHR
-
IDA
18h 17m
2 stops
£644American Airlines
Sun, 6 Sep - Sat, 12 Sep
American Airlines Logo
07:48 - 15:05
IDA
-
LHR
24h 17m
1 stop
American Airlines Logo
16:10 - 23:39
LHR
-
IDA
14h 29m
1 stop
£649American Airlines
Tue, 14 Apr - Tue, 21 Apr
American Airlines Logo
13:43 - 13:55
IDA
-
LHR
17h 12m
2 stops
American Airlines Logo
12:55 - 23:39
LHR
-
IDA
17h 44m
2 stops
£652American Airlines
Tue, 14 Apr - Tue, 21 Apr
American Airlines Logo
12:46 - 09:05
IDA
-
LHR
13h 19m
1 stop
American Airlines Logo
08:55 - 21:22
LHR
-
IDA
19h 27m
1 stop
£664American Airlines
Tue, 1 Sep - Sat, 12 Sep
American Airlines Logo
12:46 - 09:05
IDA
-
LHR
13h 19m
1 stop
American Airlines Logo
10:05 - 21:22
LHR
-
IDA
18h 17m
2 stops
£667American Airlines
Tue, 1 Sep - Sat, 12 Sep
American Airlines Logo
13:43 - 14:20
IDA
-
LHR
17h 37m
2 stops
American Airlines Logo
16:10 - 23:39
LHR
-
IDA
14h 29m
1 stop
£686American Airlines
Mon, 27 Apr - Mon, 4 May
Multiple Airlines Logo
13:43 - 10:55
IDA
-
LHR
14h 12m
1 stop
Multiple Airlines Logo
16:10 - 23:39
LHR
-
IDA
14h 29m
1 stop
£686Multiple Airlines
Mon, 27 Apr - Mon, 4 May
American Airlines Logo
13:43 - 14:20
IDA
-
LHR
17h 37m
2 stops
American Airlines Logo
12:00 - 23:39
LHR
-
IDA
18h 39m
2 stops
£689American Airlines
Mon, 27 Apr - Mon, 4 May
American Airlines Logo
07:48 - 06:50
IDA
-
LHR
16h 02m
2 stops
American Airlines Logo
12:55 - 22:15
LHR
-
IDA
16h 20m
1 stop
£690American Airlines
Wed, 13 May - Wed, 27 May

United Airlines flights from Idaho Falls to London

Our best United Airlines deals on Idaho Falls to London flight tickets
United Airlines
13 May
IDA06:30Idaho Falls Fanning Field
29h 10m
2 stops
LHR18:40London Heathrow
25 May
LHR16:25London Heathrow
31h 54m
2 stops
IDA17:19Idaho Falls Fanning Field
£774
United Airlines
1 Sept
IDA17:53Idaho Falls Fanning Field
30h 02m
2 stops
LHR06:55London Heathrow
12 Sept
LHR09:30London Heathrow
34h 54m
2 stops
IDA13:24Idaho Falls Fanning Field
£785
United Airlines
13 May
IDA10:40Idaho Falls Fanning Field
25h 00m
2 stops
LHR18:40London Heathrow
25 May
LHR16:25London Heathrow
31h 54m
2 stops
IDA17:19Idaho Falls Fanning Field
£809

American Airlines flights from Idaho Falls to London

Our best American Airlines deals on Idaho Falls to London flight tickets
American Airlines
6 Sept
IDA12:46Idaho Falls Fanning Field
15h 29m
1 stop
LHR11:15London Heathrow
12 Sept
LHR08:55London Heathrow
19h 27m
1 stop
IDA21:22Idaho Falls Fanning Field
£641
American Airlines
6 Sept
IDA12:46Idaho Falls Fanning Field
15h 29m
1 stop
LHR11:15London Heathrow
12 Sept
LHR10:05London Heathrow
18h 17m
2 stops
IDA21:22Idaho Falls Fanning Field
£644
American Airlines
14 Apr
IDA07:48Idaho Falls Fanning Field
24h 17m
1 stop
LHR15:05London Heathrow
21 Apr
LHR16:10London Heathrow
14h 29m
1 stop
IDA23:39Idaho Falls Fanning Field
£649

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 18 March 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

Sun 6/9

12:46-11:15

1 stop15h 29m

London Heathrow

Sat 12/9

08:55-21:22

1 stop19h 27m

£641

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 6/9

12:46-11:15

1 stop15h 29m

London Heathrow

Sat 12/9

10:05-21:22

2 stops18h 17m

£644

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 14/4

07:48-15:05

1 stop24h 17m

London Heathrow

Tue 21/4

16:10-23:39

1 stop14h 29m

£649

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 14/4

13:43-13:55

2 stops17h 12m

London Heathrow

Tue 21/4

12:55-23:39

2 stops17h 44m

£652

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 1/9

12:46-09:05

1 stop13h 19m

London Heathrow

Sat 12/9

08:55-21:22

1 stop19h 27m

£664

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 1/9

12:46-09:05

1 stop13h 19m

London Heathrow

Sat 12/9

10:05-21:22

2 stops18h 17m

£667

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 27/4

13:43-14:20

2 stops17h 37m

London Heathrow

Mon 4/5

16:10-23:39

1 stop14h 29m

£686
Fastest return journey

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 27/4

13:43-10:55

1 stop14h 12m

London Heathrow

Mon 4/5

16:10-23:39

1 stop14h 29m

£686

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 27/4

13:43-14:20

2 stops17h 37m

London Heathrow

Mon 4/5

12:00-23:39

2 stops18h 39m

£689

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 13/5

07:48-06:50

2 stops16h 02m

London Heathrow

Wed 27/5

12:55-22:15

1 stop16h 20m

£690

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

18h 40m

Direct flights

None
The fastest flight from Idaho Falls to London takes 18h 40m
There are no direct flights from Idaho Falls to London. There are no popular flight routes from Idaho Falls to London.
Search flight deals

  • 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 18h 40m.

  • 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.

  • 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
Luton
Gatwick
Slough
Maidstone
Southend-on-Sea
Ipswich
Canterbury
Wembley
Ilford
Chelmsford
Guildford
Hayes
Dover
Folkestone
Ramsgate
Worthing
Colchester
Bedford

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