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Cheap flights from Idaho Falls to London from $399

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 2/6. 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
0 bags

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Find the cheapest flights from Idaho Falls to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:30 am - 9:40 am
IDA
-
LHR
20h 10m1 stop
United Airlines Logo
6:35 am - 9:56 am
LHR
-
IDA
34h 21m2 stops
$629United Airlines
Wed, Jan 28 - Wed, Feb 4
United Airlines Logo
4:19 pm - 7:10 am
IDA
-
LHR
31h 51m2 stops
United Airlines Logo
6:35 am - 9:56 am
LHR
-
IDA
34h 21m2 stops
$632United Airlines
Wed, Jan 28 - Wed, Feb 4
United Airlines Logo
2:40 pm - 9:40 am
IDA
-
LHR
12h 00m1 stop
United Airlines Logo
11:10 am - 1:30 pm
LHR
-
IDA
57h 20m2 stops
$638United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
2:40 pm - 9:40 am
IDA
-
LHR
12h 00m1 stop
United Airlines Logo
4:40 pm - 1:30 pm
LHR
-
IDA
51h 50m2 stops
$639United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
4:19 pm - 8:35 pm
IDA
-
LHR
21h 16m2 stops
United Airlines Logo
4:40 pm - 9:56 am
LHR
-
IDA
48h 16m2 stops
$643United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
2:40 pm - 8:35 pm
IDA
-
LHR
22h 55m2 stops
United Airlines Logo
4:40 pm - 9:56 am
LHR
-
IDA
48h 16m2 stops
$644United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
2:40 pm - 9:40 am
IDA
-
LHR
12h 00m1 stop
United Airlines Logo
11:35 am - 9:07 pm
LHR
-
IDA
16h 32m1 stop
$656United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
2:40 pm - 9:40 am
IDA
-
LHR
12h 00m1 stop
United Airlines Logo
11:35 am - 9:07 pm
LHR
-
IDA
16h 32m1 stop
$657United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
2:35 pm - 9:40 am
IDA
-
LHR
12h 05m1 stop
United Airlines Logo
6:55 am - 9:53 am
LHR
-
IDA
33h 58m2 stops
$819United Airlines
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
6:30 am - 7:15 am
IDA
-
LHR
17h 45m2 stops
United Airlines Logo
6:55 am - 9:53 am
LHR
-
IDA
33h 58m2 stops
$824United Airlines
Tue, Apr 7 - Tue, Apr 14

United Airlines flights from Idaho Falls to London

Our best United Airlines deals on Idaho Falls to London flight tickets
United Airlines
Jan 28
IDA6:30 amIdaho Falls Fanning Field
20h 10m
1 stop
LHR9:40 amLondon Heathrow
Feb 4
LHR6:35 amLondon Heathrow
34h 21m
2 stops
IDA9:56 amIdaho Falls Fanning Field
$629
Find similar
United Airlines
Jan 28
IDA4:19 pmIdaho Falls Fanning Field
31h 51m
2 stops
LHR7:10 amLondon Heathrow
Feb 4
LHR6:35 amLondon Heathrow
34h 21m
2 stops
IDA9:56 amIdaho Falls Fanning Field
$632
Find similar
United Airlines
Jan 30
IDA2:40 pmIdaho Falls Fanning Field
12h 00m
1 stop
LHR9:40 amLondon Heathrow
Feb 3
LHR11:10 amLondon Heathrow
57h 20m
2 stops
IDA1:30 pmIdaho Falls Fanning Field
$638
Find similar

American Airlines flights from Idaho Falls to London

Our best American Airlines deals on Idaho Falls to London flight tickets
American Airlines
May 13
IDA8:24 amIdaho Falls Fanning Field
23h 41m
1 stop
LHR3:05 pmLondon Heathrow
May 27
LHR12:55 pmLondon Heathrow
15h 10m
1 stop
IDA9:05 pmIdaho Falls Fanning Field
$884
Find similar
American Airlines
May 13
IDA8:24 amIdaho Falls Fanning Field
23h 41m
1 stop
LHR3:05 pmLondon Heathrow
May 25
LHR12:55 pmLondon Heathrow
15h 10m
1 stop
IDA9:05 pmIdaho Falls Fanning Field
$944
Find similar
American Airlines
May 12
IDA8:24 amIdaho Falls Fanning Field
23h 41m
1 stop
LHR3:05 pmLondon Heathrow
May 21
LHR8:20 amLondon Heathrow
19h 45m
2 stops
IDA9:05 pmIdaho Falls Fanning Field
$5,239
Find similar

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated December 15, 2025.
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

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 1/28

6:30 am-9:40 am

1 stop20h 10m

London Heathrow

Wed 2/4

6:35 am-9:56 am

2 stops34h 21m

$629

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 1/28

4:19 pm-7:10 am

2 stops31h 51m

London Heathrow

Wed 2/4

6:35 am-9:56 am

2 stops34h 21m

$632

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 2/3

11:10 am-1:30 pm

2 stops57h 20m

$638

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 2/3

4:40 pm-1:30 pm

2 stops51h 50m

$639

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

4:19 pm-8:35 pm

2 stops21h 16m

London Heathrow

Tue 2/3

4:40 pm-9:56 am

2 stops48h 16m

$643

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

2:40 pm-8:35 pm

2 stops22h 55m

London Heathrow

Tue 2/3

4:40 pm-9:56 am

2 stops48h 16m

$644

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 2/3

11:35 am-9:07 pm

1 stop16h 32m

$656

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 2/3

11:35 am-9:07 pm

1 stop16h 32m

$657

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

2:35 pm-9:40 am

1 stop12h 05m

London Heathrow

Tue 4/14

6:55 am-9:53 am

2 stops33h 58m

$819

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

6:30 am-7:15 am

2 stops17h 45m

London Heathrow

Tue 4/14

6:55 am-9:53 am

2 stops33h 58m

$824

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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 day to depart on your flight to London?

The cheapest day to depart from Idaho Falls to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $914. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $1,486. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Idaho Falls in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $914 when looking at flights departing in the afternoon. Flights to London are more costly in the morning, with an average ticket price of $1,424. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Idaho Falls to London flights?

You could potentially save up to 13% on your flight if you consider stops on a Idaho Falls to London flight.

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 round-trip 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 23m

Direct flights

None
The fastest flight from Idaho Falls to London takes 11h 23m
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?

    A flight from Idaho Falls Fanning Field to London will travel around 4715.6 mi. Flights usually cover this in 11h 23m, depending on flying conditions and air traffic around both airports.

  • 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 updated daily.

  • How many operators does momondo search for flights from Idaho Falls Fanning Field Airport to London?

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

    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 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.

  • What is the most popular airline from Idaho Falls to London?

Best airlines flying from Idaho Falls to London

Compare and see reviews for airlines that fly from Idaho Falls to London with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $699Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Brentwood
Wembley
Watford
Ilford
Cobham
Folkestone
Romford
Richmond
Uxbridge
Stansted

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?

Flights from Idaho Falls to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo helps you find the best flight between Idaho Falls and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Price alerts on flights to London from Idaho Falls are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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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