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Cheap flights from Idaho Falls to London from $634

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Idaho Falls to London departing on 2/27. 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
6:35 am - 9:40 am
IDA
-
LHR
20h 05m
1 stop
United Airlines Logo
6:35 am - 3:40 pm
LHR
-
IDA
40h 05m
2 stops
$634United Airlines
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
2:40 pm - 9:40 am
IDA
-
LHR
12h 00m
1 stop
United Airlines Logo
6:35 am - 9:48 am
LHR
-
IDA
34h 13m
2 stops
$635United Airlines
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
5:33 pm - 8:35 pm
IDA
-
LHR
20h 02m
2 stops
United Airlines Logo
6:35 am - 1:30 pm
LHR
-
IDA
37h 55m
2 stops
$638United Airlines
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
5:33 pm - 8:35 pm
IDA
-
LHR
20h 02m
2 stops
United Airlines Logo
11:10 am - 1:30 pm
LHR
-
IDA
33h 20m
2 stops
$639United Airlines
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
10:40 am - 9:40 am
IDA
-
LHR
16h 00m
1 stop
United Airlines Logo
9:00 am - 9:53 am
LHR
-
IDA
31h 53m
2 stops
$650United Airlines
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
5:20 pm - 12:20 pm
IDA
-
LHR
12h 00m
1 stop
United Airlines Logo
9:00 am - 9:53 am
LHR
-
IDA
31h 53m
2 stops
$651United Airlines
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
2:31 pm - 6:30 am
IDA
-
LHR
32h 59m
2 stops
United Airlines Logo
6:55 am - 9:55 am
LHR
-
IDA
34h 00m
2 stops
$653United Airlines
Tue, May 5 - Fri, May 15
United Airlines Logo
5:20 pm - 10:00 am
IDA
-
LHR
33h 40m
2 stops
United Airlines Logo
9:00 am - 9:53 am
LHR
-
IDA
31h 53m
2 stops
$654United Airlines
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
5:20 pm - 10:00 am
IDA
-
LHR
33h 40m
2 stops
United Airlines Logo
9:00 am - 9:53 am
LHR
-
IDA
31h 53m
2 stops
$655United Airlines
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
2:30 pm - 12:20 pm
IDA
-
LHR
14h 50m
1 stop
United Airlines Logo
9:30 am - 9:53 am
LHR
-
IDA
31h 23m
2 stops
$662United Airlines
Sun, Apr 12 - Tue, Apr 21

Delta flights from Idaho Falls to London Heathrow Airport

Our best Delta deals on Idaho Falls to London Heathrow Airport flight tickets
Delta
Apr 8
IDA1:10 pmIdaho Falls Fanning Field
13h 50m
1 stop
LHR10:00 amLondon Heathrow
Apr 20
LHR5:35 pmLondon Heathrow
31h 42m
2 stops
IDA6:17 pmIdaho Falls Fanning Field
$670
Delta
Apr 14
IDA1:09 pmIdaho Falls Fanning Field
19h 26m
2 stops
LHR3:35 pmLondon Heathrow
Apr 20
LHR5:35 pmLondon Heathrow
31h 42m
2 stops
IDA6:17 pmIdaho Falls Fanning Field
$675
Delta
Apr 8
IDA6:55 pmIdaho Falls Fanning Field
18h 15m
2 stops
LHR8:10 pmLondon Heathrow
Apr 20
LHR5:35 pmLondon Heathrow
31h 42m
2 stops
IDA6:17 pmIdaho Falls Fanning Field
$725

KLM flights from Idaho Falls to London Heathrow Airport

Our best KLM deals on Idaho Falls to London Heathrow Airport flight tickets
KLM
Apr 14
IDA1:11 pmIdaho Falls Fanning Field
14h 49m
1 stop
LHR11:00 amLondon Heathrow
Apr 22
LHR11:40 amLondon Heathrow
17h 55m
2 stops
IDA10:35 pmIdaho Falls Fanning Field
$684
KLM
Apr 12
IDA6:55 pmIdaho Falls Fanning Field
32h 05m
1 stop
LHR10:00 amLondon Heathrow
Apr 22
LHR11:40 amLondon Heathrow
17h 55m
2 stops
IDA10:35 pmIdaho Falls Fanning Field
$689
KLM
Apr 12
IDA6:55 pmIdaho Falls Fanning Field
14h 20m
2 stops
LHR4:15 pmLondon Heathrow
Apr 22
LHR11:40 amLondon Heathrow
17h 55m
2 stops
IDA10:35 pmIdaho Falls Fanning Field
$883

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 January 31, 2026.
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 2/27

6:35 am-9:40 am

1 stop20h 05m

London Heathrow

Tue 3/3

6:35 am-3:40 pm

2 stops40h 05m

$634

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 2/27

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 3/3

6:35 am-9:48 am

2 stops34h 13m

$635

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 2/27

5:33 pm-8:35 pm

2 stops20h 02m

London Heathrow

Tue 3/3

6:35 am-1:30 pm

2 stops37h 55m

$638

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 2/27

5:33 pm-8:35 pm

2 stops20h 02m

London Heathrow

Tue 3/3

11:10 am-1:30 pm

2 stops33h 20m

$639

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

10:40 am-9:40 am

1 stop16h 00m

London Heathrow

Tue 4/14

9:00 am-9:53 am

2 stops31h 53m

$650

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

5:20 pm-12:20 pm

1 stop12h 00m

London Heathrow

Tue 4/14

9:00 am-9:53 am

2 stops31h 53m

$651

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 5/5

2:31 pm-6:30 am

2 stops32h 59m

London Heathrow

Fri 5/15

6:55 am-9:55 am

2 stops34h 00m

$653

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

5:20 pm-10:00 am

2 stops33h 40m

London Heathrow

Tue 4/14

9:00 am-9:53 am

2 stops31h 53m

$654

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

5:20 pm-10:00 am

2 stops33h 40m

London Heathrow

Tue 4/14

9:00 am-9:53 am

2 stops31h 53m

$655

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 4/12

2:30 pm-12:20 pm

1 stop14h 50m

London Heathrow

Tue 4/21

9:30 am-9:53 am

2 stops31h 23m

$662

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

12h 00m

Direct flights

None
The fastest flight from Idaho Falls to London Heathrow Airport takes 12h 00m
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 12h 00m, 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
9,219 reviews
Search United Airlines flights

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

    Price Alerts will notify you by email when the price for flights to London Heathrow Airport from Idaho Falls decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

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

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for 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.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Guildford
Crawley
Wembley
Dartford
Stratford-upon-Avon
Hayes
Croydon
Brentwood
Harrow
Watford
Cobham
Folkestone
Romford
Stansted

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.

An easier way to manage your London Heathrow Airport trip

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