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Cheap flights from Idaho Falls to London from $428

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 10/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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
5:40 pm - 9:40 am
IDA
-
LHR
33h 00m
1 stop
United Airlines Logo
6:35 am - 9:28 am
LHR
-
IDA
33h 53m
2 stops
$827United Airlines
Mon, Nov 30 - Thu, Dec 3
United Airlines Logo
5:40 pm - 9:40 am
IDA
-
LHR
33h 00m
1 stop
United Airlines Logo
9:30 am - 9:08 pm
LHR
-
IDA
42h 38m
2 stops
$832United Airlines
Mon, Nov 30 - Thu, Dec 3
United Airlines Logo
5:40 pm - 7:40 am
IDA
-
LHR
31h 00m
2 stops
United Airlines Logo
6:35 am - 9:28 am
LHR
-
IDA
33h 53m
2 stops
$837United Airlines
Mon, Nov 30 - Thu, Dec 3
United Airlines Logo
5:40 pm - 10:15 am
IDA
-
LHR
33h 35m
2 stops
United Airlines Logo
9:30 am - 9:08 pm
LHR
-
IDA
42h 38m
2 stops
$842United Airlines
Mon, Nov 30 - Thu, Dec 3
Multiple Airlines Logo
1:46 pm - 1:45 pm
IDA
-
LHR
16h 59m
1 stop
Multiple Airlines Logo
8:15 am - 9:42 pm
LHR
-
IDA
20h 27m
2 stops
$868Multiple Airlines
Wed, Oct 7 - Tue, Oct 13
Multiple Airlines Logo
1:05 pm - 10:00 am
IDA
-
LHR
13h 55m
1 stop
Multiple Airlines Logo
5:50 pm - 6:14 pm
LHR
-
IDA
31h 24m
2 stops
$875Multiple Airlines
Tue, Nov 3 - Tue, Nov 10
KLM Logo
6:00 am - 7:05 am
IDA
-
LHR
18h 05m
2 stops
KLM Logo
5:50 pm - 6:14 pm
LHR
-
IDA
31h 24m
2 stops
$880KLM
Tue, Nov 3 - Tue, Nov 10
Alaska Airlines Logo
6:04 am - 12:20 pm
IDA
-
LHR
23h 16m
1 stop
Alaska Airlines Logo
2:45 pm - 11:42 pm
LHR
-
IDA
15h 57m
1 stop
$886Alaska Airlines
Tue, Nov 3 - Tue, Nov 10
Alaska Airlines Logo
1:53 pm - 12:20 pm
IDA
-
LHR
15h 27m
1 stop
Alaska Airlines Logo
2:45 pm - 11:42 pm
LHR
-
IDA
15h 57m
1 stop
$887Alaska Airlines
Wed, Nov 11 - Wed, Nov 18
United Airlines Logo
10:35 am - 11:55 am
IDA
-
LHR
18h 20m
2 stops
United Airlines Logo
7:30 am - 5:16 pm
LHR
-
IDA
16h 46m
2 stops
$891United Airlines
Wed, Oct 7 - Tue, Oct 13

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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
Oct 7
IDA1:39 pmIdaho Falls Fanning Field
14h 16m
1 stop
LHR10:55 amLondon Heathrow
Oct 13
LHR12:55 pmLondon Heathrow
15h 47m
1 stop
IDA9:42 pmIdaho Falls Fanning Field
$934
American Airlines
Aug 9
IDA7:00 amIdaho Falls Fanning Field
17h 20m
2 stops
LHR7:20 amLondon Heathrow
Aug 25
LHR8:15 amLondon Heathrow
20h 05m
2 stops
IDA9:20 pmIdaho Falls Fanning Field
$1,019
American Airlines
Sep 16
IDA1:58 pmIdaho Falls Fanning Field
13h 52m
1 stop
LHR10:50 amLondon Heathrow
Sep 20
LHR4:55 pmLondon Heathrow
25h 50m
1 stop
IDA11:45 amIdaho Falls Fanning Field
$1,022

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
Nov 30
IDA5:40 pmIdaho Falls Fanning Field
33h 00m
1 stop
LHR9:40 amLondon Heathrow
Dec 3
LHR6:35 amLondon Heathrow
33h 53m
2 stops
IDA9:28 amIdaho Falls Fanning Field
$827
United Airlines
Nov 30
IDA5:40 pmIdaho Falls Fanning Field
33h 00m
1 stop
LHR9:40 amLondon Heathrow
Dec 3
LHR9:30 amLondon Heathrow
42h 38m
2 stops
IDA9:08 pmIdaho Falls Fanning Field
$832
United Airlines
Nov 30
IDA5:40 pmIdaho Falls Fanning Field
31h 00m
2 stops
LHR7:40 amLondon Heathrow
Dec 3
LHR6:35 amLondon Heathrow
33h 53m
2 stops
IDA9:28 amIdaho Falls Fanning Field
$837

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 July 11, 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 11/30

5:40 pm-9:40 am

1 stop33h 00m

London Heathrow

Thu 12/3

6:35 am-9:28 am

2 stops33h 53m

$827

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 11/30

5:40 pm-9:40 am

1 stop33h 00m

London Heathrow

Thu 12/3

9:30 am-9:08 pm

2 stops42h 38m

$832

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 11/30

5:40 pm-7:40 am

2 stops31h 00m

London Heathrow

Thu 12/3

6:35 am-9:28 am

2 stops33h 53m

$837

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 11/30

5:40 pm-10:15 am

2 stops33h 35m

London Heathrow

Thu 12/3

9:30 am-9:08 pm

2 stops42h 38m

$842

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

1:46 pm-1:45 pm

1 stop16h 59m

London Heathrow

Tue 10/13

8:15 am-9:42 pm

2 stops20h 27m

$868

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 11/3

1:05 pm-10:00 am

1 stop13h 55m

London Heathrow

Tue 11/10

5:50 pm-6:14 pm

2 stops31h 24m

$875

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 11/3

6:00 am-7:05 am

2 stops18h 05m

London Heathrow

Tue 11/10

5:50 pm-6:14 pm

2 stops31h 24m

$880

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 11/3

6:04 am-12:20 pm

1 stop23h 16m

London Heathrow

Tue 11/10

2:45 pm-11:42 pm

1 stop15h 57m

$886
Quickest round-trip

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 11/11

1:53 pm-12:20 pm

1 stop15h 27m

London Heathrow

Wed 11/18

2:45 pm-11:42 pm

1 stop15h 57m

$887

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

10:35 am-11:55 am

2 stops18h 20m

London Heathrow

Tue 10/13

7:30 am-5:16 pm

2 stops16h 46m

$891

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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

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

11h 41m

Direct flights

None
The fastest flight from Idaho Falls to London Heathrow Airport takes 11h 41m
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 11h 41m, 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
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Gatwick
Milton Keynes
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Hayes
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Crawley
Wembley
Croydon
Stansted
Stratford-upon-Avon
Harrow
Slough
Watford
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Ilford
Cobham
Folkestone
Guildford
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.

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