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Cheap flights from Idaho Falls to London from $869

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 9/14. 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.
American Airlines Logo
12:15 pm - 10:55 am
IDA
-
LHR
15h 40m
1 stop
American Airlines Logo
8:15 am - 9:20 pm
LHR
-
IDA
20h 05m
2 stops
$869American Airlines
Mon, Sep 14 - Tue, Sep 29
United Airlines Logo
2:25 pm - 9:40 am
IDA
-
LHR
12h 15m
1 stop
United Airlines Logo
7:25 am - 3:23 pm
LHR
-
IDA
38h 58m
2 stops
$882United Airlines
Wed, Oct 7 - Tue, Oct 13
United Airlines Logo
2:25 pm - 12:35 pm
IDA
-
LHR
15h 10m
1 stop
United Airlines Logo
2:05 pm - 1:29 pm
LHR
-
IDA
30h 24m
2 stops
$885United Airlines
Wed, Oct 7 - Tue, Oct 13
United Airlines Logo
5:53 pm - 8:40 pm
IDA
-
LHR
19h 47m
2 stops
United Airlines Logo
7:30 am - 5:16 pm
LHR
-
IDA
16h 46m
2 stops
$892United Airlines
Sat, Sep 12 - Wed, Sep 23
Alaska Airlines Logo
1:46 pm - 3:05 pm
IDA
-
LHR
18h 19m
1 stop
Alaska Airlines Logo
5:00 pm - 3:35 pm
LHR
-
IDA
29h 35m
1 stop
$893Alaska Airlines
Wed, Oct 7 - Tue, Oct 13
Alaska Airlines Logo
6:09 am - 3:05 pm
IDA
-
LHR
25h 56m
1 stop
Alaska Airlines Logo
5:00 pm - 3:35 pm
LHR
-
IDA
29h 35m
1 stop
$898Alaska Airlines
Wed, Oct 7 - Tue, Oct 13
United Airlines Logo
2:25 pm - 12:25 pm
IDA
-
LHR
15h 00m
1 stop
United Airlines Logo
11:25 am - 5:16 pm
LHR
-
IDA
12h 51m
1 stop
$905United Airlines
Mon, Sep 14 - Tue, Sep 29
United Airlines Logo
4:04 pm - 8:40 pm
IDA
-
LHR
21h 36m
2 stops
United Airlines Logo
10:00 am - 9:02 pm
LHR
-
IDA
18h 02m
2 stops
$910United Airlines
Mon, Sep 14 - Tue, Sep 29
United Airlines Logo
2:25 pm - 12:25 pm
IDA
-
LHR
15h 00m
1 stop
United Airlines Logo
7:30 am - 5:16 pm
LHR
-
IDA
16h 46m
2 stops
$938United Airlines
Sat, Sep 12 - Wed, Sep 23
Delta Logo
6:00 am - 1:05 pm
IDA
-
LHR
24h 05m
2 stops
Delta Logo
6:30 am - 10:19 pm
LHR
-
IDA
22h 49m
2 stops
$950Delta
Wed, Oct 7 - Tue, Oct 13

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
Oct 7
IDA2:25 pmIdaho Falls Fanning Field
12h 15m
1 stop
LHR9:40 amLondon Heathrow
Oct 13
LHR7:25 amLondon Heathrow
38h 58m
2 stops
IDA3:23 pmIdaho Falls Fanning Field
$882
United Airlines
Oct 7
IDA2:25 pmIdaho Falls Fanning Field
15h 10m
1 stop
LHR12:35 pmLondon Heathrow
Oct 13
LHR2:05 pmLondon Heathrow
30h 24m
2 stops
IDA1:29 pmIdaho Falls Fanning Field
$885
United Airlines
Sep 12
IDA5:53 pmIdaho Falls Fanning Field
19h 47m
2 stops
LHR8:40 pmLondon Heathrow
Sep 23
LHR7:30 amLondon Heathrow
16h 46m
2 stops
IDA5:16 pmIdaho Falls Fanning Field
$892

Alaska Airlines flights from Idaho Falls to London Heathrow Airport

Our best Alaska Airlines deals on Idaho Falls to London Heathrow Airport flight tickets
Alaska Airlines
Oct 7
IDA1:46 pmIdaho Falls Fanning Field
18h 19m
1 stop
LHR3:05 pmLondon Heathrow
Oct 13
LHR5:00 pmLondon Heathrow
29h 35m
1 stop
IDA3:35 pmIdaho Falls Fanning Field
$893
Alaska Airlines
Oct 7
IDA6:09 amIdaho Falls Fanning Field
25h 56m
1 stop
LHR3:05 pmLondon Heathrow
Oct 13
LHR5:00 pmLondon Heathrow
29h 35m
1 stop
IDA3:35 pmIdaho Falls Fanning Field
$898

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 May 26, 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

Mon 9/14

12:15 pm-10:55 am

1 stop15h 40m

London Heathrow

Tue 9/29

8:15 am-9:20 pm

2 stops20h 05m

$869

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

2:25 pm-9:40 am

1 stop12h 15m

London Heathrow

Tue 10/13

7:25 am-3:23 pm

2 stops38h 58m

$882

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

2:25 pm-12:35 pm

1 stop15h 10m

London Heathrow

Tue 10/13

2:05 pm-1:29 pm

2 stops30h 24m

$885

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sat 9/12

5:53 pm-8:40 pm

2 stops19h 47m

London Heathrow

Wed 9/23

7:30 am-5:16 pm

2 stops16h 46m

$892

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

1:46 pm-3:05 pm

1 stop18h 19m

London Heathrow

Tue 10/13

5:00 pm-3:35 pm

1 stop29h 35m

$893

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

6:09 am-3:05 pm

1 stop25h 56m

London Heathrow

Tue 10/13

5:00 pm-3:35 pm

1 stop29h 35m

$898
Quickest round-trip

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 9/14

2:25 pm-12:25 pm

1 stop15h 00m

London Heathrow

Tue 9/29

11:25 am-5:16 pm

1 stop12h 51m

$905

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 9/14

4:04 pm-8:40 pm

2 stops21h 36m

London Heathrow

Tue 9/29

10:00 am-9:02 pm

2 stops18h 02m

$910

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sat 9/12

2:25 pm-12:25 pm

1 stop15h 00m

London Heathrow

Wed 9/23

7:30 am-5:16 pm

2 stops16h 46m

$938

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

6:00 am-1:05 pm

2 stops24h 05m

London Heathrow

Tue 10/13

6:30 am-10:19 pm

2 stops22h 49m

$950

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

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

You could potentially save up to 20% 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

12h 10m

Direct flights

None
The fastest flight from Idaho Falls to London Heathrow Airport takes 12h 10m
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

Frequently asked questions about flying from Idaho Falls to London Heathrow Airport

  • 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 10m, 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 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.

Traveling to a place near London?

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

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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