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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
2:40 pm - 9:40 am
IDA
-
LHR
12h 00m1 stop
United Airlines Logo
11:10 am - 3:31 pm
LHR
-
IDA
59h 21m2 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
11:10 am - 3:31 pm
LHR
-
IDA
59h 21m2 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
4:19 pm - 9:20 pm
IDA
-
LHR
22h 01m2 stops
United Airlines Logo
7:30 am - 9:07 pm
LHR
-
IDA
20h 37m2 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 - 12:20 pm
IDA
-
LHR
14h 45m1 stop
United Airlines Logo
7:25 am - 9:53 am
LHR
-
IDA
33h 28m2 stops
$818United Airlines
Tue, Apr 7 - Tue, Apr 14
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
7:25 am - 9:53 am
LHR
-
IDA
33h 28m2 stops
$823United 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 Heathrow Airport

Our best United Airlines deals on Idaho Falls to London Heathrow Airport flight tickets
United Airlines
Jan 30
IDA2:40 pmIdaho Falls Fanning Field
12h 00m
1 stop
LHR9:40 amLondon Heathrow
Feb 3
LHR11:10 amLondon Heathrow
59h 21m
2 stops
IDA3:31 pmIdaho Falls Fanning Field
$638
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
59h 21m
2 stops
IDA3:31 pmIdaho Falls Fanning Field
$639
Find similar
United Airlines
Jan 30
IDA4:19 pmIdaho Falls Fanning Field
21h 16m
2 stops
LHR8:35 pmLondon Heathrow
Feb 3
LHR4:40 pmLondon Heathrow
48h 16m
2 stops
IDA9:56 amIdaho Falls Fanning Field
$643
Find similar

American Airlines flights from Idaho Falls to London Heathrow Airport

Our best American Airlines deals on Idaho Falls to London Heathrow Airport flight tickets
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
American Airlines
May 12
IDA1:45 pmIdaho Falls Fanning Field
16h 05m
2 stops
LHR12:50 pmLondon Heathrow
May 21
LHR8:20 amLondon Heathrow
19h 45m
2 stops
IDA9:05 pmIdaho Falls Fanning Field
$5,244
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Idaho Falls 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 December 14, 2025.
Use the filters below to find and compare flights from Idaho Falls to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

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-3:31 pm

2 stops59h 21m

$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

11:10 am-3:31 pm

2 stops59h 21m

$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

4:19 pm-9:20 pm

2 stops22h 01m

London Heathrow

Tue 2/3

7:30 am-9:07 pm

2 stops20h 37m

$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-12:20 pm

1 stop14h 45m

London Heathrow

Tue 4/14

7:25 am-9:53 am

2 stops33h 28m

$818

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

7:25 am-9:53 am

2 stops33h 28m

$823

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 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 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 day to depart on your flight to London Heathrow Airport?

Our data shows that Thursday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $776. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $1,518.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Idaho Falls to London Heathrow Airport in the afternoon for as low as $767. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $1,153.

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

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

When to book flights from Idaho Falls to London Heathrow Airport

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

Cheap Idaho Falls to London Heathrow Airport (IDA to LHR) flight deals and tips

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

Fastest flight time

11h 23m

Direct flights

None
The fastest flight from Idaho Falls to London Heathrow Airport takes 11h 23m
There are no direct flights from Idaho Falls to London Heathrow Airport. There are no popular flight routes from Idaho Falls to London Heathrow Airport.
Search flight deals

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

    The straight-line distance from Idaho Falls Fanning Field to London Heathrow is 4706.6 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 Heathrow Airport?

    Prices for flights from Idaho Falls Fanning Field Airport to London Heathrow Airport are updated daily.

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

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

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

    The necessary travel and health documents for your London Heathrow Airport 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 Heathrow Airport?

Best airlines flying from Idaho Falls to London Heathrow Airport

Compare and see reviews for airlines that fly from Idaho Falls to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $699Free CancellationRating
7.4
9,094 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
Stratford-upon-Avon
Crawley
Brentwood
Salisbury
Wembley
Watford
Ilford
Cobham
Folkestone
Romford
Richmond

Why use momondo?

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

Yes. momondo can track prices for Idaho Falls to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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