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Cheap flights from Idaho Falls to London from $855

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 9/6. 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
1 adult, Economy, 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.
American Airlines Logo
12:46 pm - 11:15 am
IDA
-
LHR
15h 29m
1 stop
American Airlines Logo
8:55 am - 9:22 pm
LHR
-
IDA
19h 27m
1 stop
$855American Airlines
Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
12:46 pm - 11:15 am
IDA
-
LHR
15h 29m
1 stop
American Airlines Logo
10:05 am - 9:22 pm
LHR
-
IDA
18h 17m
2 stops
$859American Airlines
Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
7:48 am - 3:05 pm
IDA
-
LHR
24h 17m
1 stop
American Airlines Logo
4:10 pm - 11:39 pm
LHR
-
IDA
14h 29m
1 stop
$865American Airlines
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
1:43 pm - 12:10 pm
IDA
-
LHR
15h 27m
1 stop
American Airlines Logo
9:45 am - 11:39 pm
LHR
-
IDA
20h 54m
2 stops
$869American Airlines
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
12:46 pm - 9:05 am
IDA
-
LHR
13h 19m
1 stop
American Airlines Logo
8:55 am - 9:22 pm
LHR
-
IDA
19h 27m
1 stop
$885American Airlines
Tue, Sep 1 - Sat, Sep 12
American Airlines Logo
12:46 pm - 9:05 am
IDA
-
LHR
13h 19m
1 stop
American Airlines Logo
10:05 am - 9:22 pm
LHR
-
IDA
18h 17m
2 stops
$889American Airlines
Tue, Sep 1 - Sat, Sep 12
American Airlines Logo
1:43 pm - 2:20 pm
IDA
-
LHR
17h 37m
2 stops
American Airlines Logo
4:10 pm - 11:39 pm
LHR
-
IDA
14h 29m
1 stop
$914American Airlines
Mon, Apr 27 - Mon, May 4
Multiple Airlines Logo
1:43 pm - 10:55 am
IDA
-
LHR
14h 12m
1 stop
Multiple Airlines Logo
4:10 pm - 11:39 pm
LHR
-
IDA
14h 29m
1 stop
$915Multiple Airlines
Mon, Apr 27 - Mon, May 4
American Airlines Logo
1:43 pm - 2:20 pm
IDA
-
LHR
17h 37m
2 stops
American Airlines Logo
12:00 pm - 11:39 pm
LHR
-
IDA
18h 39m
2 stops
$919American Airlines
Mon, Apr 27 - Mon, May 4
American Airlines Logo
7:48 am - 6:50 am
IDA
-
LHR
16h 02m
2 stops
American Airlines Logo
12:55 pm - 10:15 pm
LHR
-
IDA
16h 20m
1 stop
$920American Airlines
Wed, May 13 - Wed, May 27

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
May 13
IDA6:30 amIdaho Falls Fanning Field
29h 10m
2 stops
LHR6:40 pmLondon Heathrow
May 25
LHR4:25 pmLondon Heathrow
31h 54m
2 stops
IDA5:19 pmIdaho Falls Fanning Field
$1,032
United Airlines
Sep 1
IDA5:53 pmIdaho Falls Fanning Field
30h 02m
2 stops
LHR6:55 amLondon Heathrow
Sep 12
LHR9:30 amLondon Heathrow
34h 54m
2 stops
IDA1:24 pmIdaho Falls Fanning Field
$1,047
United Airlines
May 13
IDA10:40 amIdaho Falls Fanning Field
25h 00m
2 stops
LHR6:40 pmLondon Heathrow
May 25
LHR4:25 pmLondon Heathrow
31h 54m
2 stops
IDA5:19 pmIdaho Falls Fanning Field
$1,079

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
Sep 6
IDA12:46 pmIdaho Falls Fanning Field
15h 29m
1 stop
LHR11:15 amLondon Heathrow
Sep 12
LHR8:55 amLondon Heathrow
19h 27m
1 stop
IDA9:22 pmIdaho Falls Fanning Field
$855
American Airlines
Sep 6
IDA12:46 pmIdaho Falls Fanning Field
15h 29m
1 stop
LHR11:15 amLondon Heathrow
Sep 12
LHR10:05 amLondon Heathrow
18h 17m
2 stops
IDA9:22 pmIdaho Falls Fanning Field
$859
American Airlines
Apr 14
IDA7:48 amIdaho Falls Fanning Field
24h 17m
1 stop
LHR3:05 pmLondon Heathrow
Apr 21
LHR4:10 pmLondon Heathrow
14h 29m
1 stop
IDA11:39 pmIdaho Falls Fanning Field
$865

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 March 18, 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

Cheapest round-trip

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 9/6

12:46 pm-11:15 am

1 stop15h 29m

London Heathrow

Sat 9/12

8:55 am-9:22 pm

1 stop19h 27m

$855

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 9/6

12:46 pm-11:15 am

1 stop15h 29m

London Heathrow

Sat 9/12

10:05 am-9:22 pm

2 stops18h 17m

$859

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/14

7:48 am-3:05 pm

1 stop24h 17m

London Heathrow

Tue 4/21

4:10 pm-11:39 pm

1 stop14h 29m

$865

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/14

1:43 pm-12:10 pm

1 stop15h 27m

London Heathrow

Tue 4/21

9:45 am-11:39 pm

2 stops20h 54m

$869

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 9/1

12:46 pm-9:05 am

1 stop13h 19m

London Heathrow

Sat 9/12

8:55 am-9:22 pm

1 stop19h 27m

$885

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 9/1

12:46 pm-9:05 am

1 stop13h 19m

London Heathrow

Sat 9/12

10:05 am-9:22 pm

2 stops18h 17m

$889

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 4/27

1:43 pm-2:20 pm

2 stops17h 37m

London Heathrow

Mon 5/4

4:10 pm-11:39 pm

1 stop14h 29m

$914
Quickest round-trip

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 4/27

1:43 pm-10:55 am

1 stop14h 12m

London Heathrow

Mon 5/4

4:10 pm-11:39 pm

1 stop14h 29m

$915

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 4/27

1:43 pm-2:20 pm

2 stops17h 37m

London Heathrow

Mon 5/4

12:00 pm-11:39 pm

2 stops18h 39m

$919

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 5/13

7:48 am-6:50 am

2 stops16h 02m

London Heathrow

Wed 5/27

12:55 pm-10:15 pm

1 stop16h 20m

$920

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

14h 42m

Direct flights

None
The fastest flight from Idaho Falls to London Heathrow Airport takes 14h 42m
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 14h 42m, 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
9,435 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
Crawley
Stratford-upon-Avon
Wembley
Hayes
Dartford
Croydon
Harrow
Watford
Brentwood
Guildford
Stansted
Cobham
Folkestone
Romford

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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