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Cheap flights from Idaho Falls to London from $590

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 12/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
KLM Logo
1:17 pm - 10:00 amIDA-LHR
13h 43m1 stop
KLM Logo
8:00 pm - 6:26 pmLHR-IDA
29h 26m2 stops
$590KLM
Find Deal
Tue, Dec 2 - Tue, Dec 9
Delta Logo
7:06 pm - 8:10 pmIDA-LHR
18h 04m2 stops
Delta Logo
8:55 am - 10:21 pmLHR-IDA
20h 26m2 stops
$604Delta
Find Deal
Tue, Dec 2 - Tue, Dec 9
United Airlines Logo
2:35 pm - 9:40 amIDA-LHR
12h 05m1 stop
United Airlines Logo
7:25 am - 9:28 amLHR-IDA
33h 03m2 stops
$748United Airlines
Find Deal
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
5:57 pm - 8:40 pmIDA-LHR
19h 43m2 stops
United Airlines Logo
7:25 am - 9:28 amLHR-IDA
33h 03m2 stops
$753United Airlines
Find Deal
Tue, Apr 7 - Tue, Apr 14
KLM Logo
1:05 pm - 9:50 amIDA-LHR
13h 45m1 stop
KLM Logo
10:55 am - 6:14 pmLHR-IDA
14h 19m1 stop
$772KLM
Find Deal
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
7:00 am - 12:20 pmIDA-LHR
22h 20m1 stop
United Airlines Logo
7:25 am - 9:08 pmLHR-IDA
20h 43m2 stops
$793United Airlines
Find Deal
Fri, Apr 3 - Tue, Apr 7
Delta Logo
1:05 pm - 1:45 pmIDA-LHR
18h 40m2 stops
Delta Logo
3:25 pm - 6:15 pmLHR-IDA
33h 50m2 stops
$801Delta
Find Deal
Fri, Mar 27 - Tue, Mar 31
Multiple Airlines Logo
1:16 pm - 10:00 amIDA-LHR
13h 44m1 stop
Multiple Airlines Logo
4:30 pm - 12:46 pmLHR-IDA
27h 16m1 stop
$969Multiple Airlines
Find Deal
Thu, Dec 18 - Wed, Dec 24
American Airlines Logo
8:23 am - 1:15 pmIDA-LHR
22h 52m1 stop
American Airlines Logo
10:05 am - 9:57 pmLHR-IDA
18h 52m1 stop
$1,006American Airlines
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Fri, Mar 27 - Tue, Mar 31
American Airlines Logo
1:43 pm - 11:40 amIDA-LHR
15h 57m1 stop
American Airlines Logo
10:05 am - 9:57 pmLHR-IDA
18h 52m1 stop
$1,007American Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31

KLM flights from Idaho Falls to London Heathrow Airport

Our best KLM deals on Idaho Falls to London Heathrow Airport flight tickets
KLM
Dec 2
IDA1:17 pmIdaho Falls Fanning Field
13h 43m
1 stop
LHR10:00 amLondon Heathrow
Dec 9
LHR8:00 pmLondon Heathrow
29h 26m
2 stops
IDA6:26 pmIdaho Falls Fanning Field
$590
Find similar
KLM
Apr 7
IDA1:05 pmIdaho Falls Fanning Field
13h 45m
1 stop
LHR9:50 amLondon Heathrow
Apr 14
LHR10:55 amLondon Heathrow
14h 19m
1 stop
IDA6:14 pmIdaho Falls Fanning Field
$772
Find similar

Delta flights from Idaho Falls to London Heathrow Airport

Our best Delta deals on Idaho Falls to London Heathrow Airport flight tickets
Delta
Dec 2
IDA7:06 pmIdaho Falls Fanning Field
18h 04m
2 stops
LHR8:10 pmLondon Heathrow
Dec 9
LHR8:55 amLondon Heathrow
20h 26m
2 stops
IDA10:21 pmIdaho Falls Fanning Field
$604
Find similar
Delta
Mar 27
IDA1:05 pmIdaho Falls Fanning Field
18h 40m
2 stops
LHR1:45 pmLondon Heathrow
Mar 31
LHR3:25 pmLondon Heathrow
33h 50m
2 stops
IDA6:15 pmIdaho Falls Fanning Field
$801
Find similar
Delta
Mar 27
IDA1:05 pmIdaho Falls Fanning Field
15h 25m
2 stops
LHR10:30 amLondon Heathrow
Mar 31
LHR10:55 amLondon Heathrow
18h 26m
1 stop
IDA10:21 pmIdaho Falls Fanning Field
$811
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 October 27, 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

Tue 12/2

1:17 pm-10:00 am

1 stop13h 43m

London Heathrow

Tue 12/9

8:00 pm-6:26 pm

2 stops29h 26m

$590

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 12/2

7:06 pm-8:10 pm

2 stops18h 04m

London Heathrow

Tue 12/9

8:55 am-10:21 pm

2 stops20h 26m

$604

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

7:25 am-9:28 am

2 stops33h 03m

$748

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

5:57 pm-8:40 pm

2 stops19h 43m

London Heathrow

Tue 4/14

7:25 am-9:28 am

2 stops33h 03m

$753

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

1:05 pm-9:50 am

1 stop13h 45m

London Heathrow

Tue 4/14

10:55 am-6:14 pm

1 stop14h 19m

$772

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 4/3

7:00 am-12:20 pm

1 stop22h 20m

London Heathrow

Tue 4/7

7:25 am-9:08 pm

2 stops20h 43m

$793

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 3/27

1:05 pm-1:45 pm

2 stops18h 40m

London Heathrow

Tue 3/31

3:25 pm-6:15 pm

2 stops33h 50m

$801

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 12/18

1:16 pm-10:00 am

1 stop13h 44m

London Heathrow

Wed 12/24

4:30 pm-12:46 pm

1 stop27h 16m

$969

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 3/27

8:23 am-1:15 pm

1 stop22h 52m

London Heathrow

Tue 3/31

10:05 am-9:57 pm

1 stop18h 52m

$1,006

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 3/27

1:43 pm-11:40 am

1 stop15h 57m

London Heathrow

Tue 3/31

10:05 am-9:57 pm

1 stop18h 52m

$1,007

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 1% 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

Direct flights

None
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 05m, 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
8,997 reviews
Search United Airlines flights

Traveling to a place near London?

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Romford
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Wembley

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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