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Cheap flights from Idaho Falls to London from $463

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 9/1. 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.
Alaska Airlines Logo
6:15 am - 12:20 pm
IDA
-
LHR
23h 05m
1 stop
Alaska Airlines Logo
2:45 pm - 10:39 pm
LHR
-
IDA
14h 54m
1 stop
$887Alaska Airlines
Tue, Dec 8 - Tue, Dec 15
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
$897Multiple Airlines
Wed, Oct 7 - Tue, Oct 13
KLM Logo
6:00 am - 10:00 am
IDA
-
LHR
21h 00m
1 stop
KLM Logo
8:25 pm - 6:14 pm
LHR
-
IDA
28h 49m
2 stops
$904KLM
Wed, Nov 11 - Wed, Nov 18
Multiple Airlines Logo
1:10 pm - 1:45 pm
IDA
-
LHR
17h 35m
2 stops
Multiple Airlines Logo
5:50 pm - 6:14 pm
LHR
-
IDA
31h 24m
2 stops
$908Multiple Airlines
Wed, Nov 11 - Wed, Nov 18
American Airlines Logo
1:39 pm - 10:55 am
IDA
-
LHR
14h 16m
1 stop
American Airlines Logo
12:55 pm - 9:42 pm
LHR
-
IDA
15h 47m
1 stop
$934American Airlines
Wed, Oct 7 - Tue, Oct 13
Lufthansa Logo
2:35 pm - 9:40 am
IDA
-
LHR
12h 05m
1 stop
Lufthansa Logo
7:30 am - 9:08 pm
LHR
-
IDA
20h 38m
2 stops
$937Lufthansa
Tue, Dec 8 - Tue, Dec 15
United Airlines Logo
10:35 am - 11:35 am
IDA
-
LHR
18h 00m
2 stops
United Airlines Logo
9:30 am - 5:16 pm
LHR
-
IDA
38h 46m
2 stops
$940United Airlines
Wed, Oct 7 - Tue, Oct 13
Lufthansa Logo
10:45 am - 10:50 am
IDA
-
LHR
17h 05m
2 stops
Lufthansa Logo
7:30 am - 5:22 pm
LHR
-
IDA
16h 52m
2 stops
$941Lufthansa
Tue, Dec 8 - Tue, Dec 15
Alaska Airlines Logo
1:46 pm - 3:05 pm
IDA
-
LHR
18h 19m
1 stop
Alaska Airlines Logo
2:45 pm - 3:17 pm
LHR
-
IDA
31h 32m
1 stop
$942Alaska Airlines
Fri, Oct 16 - Tue, Nov 3
Lufthansa Logo
10:45 am - 10:50 am
IDA
-
LHR
17h 05m
2 stops
Lufthansa Logo
7:30 am - 5:22 pm
LHR
-
IDA
16h 52m
2 stops
$943Lufthansa
Tue, Dec 8 - Tue, Dec 15

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Delta flights from Idaho Falls to London

Our best Delta deals on Idaho Falls to London flight tickets
Delta
Sep 4
IDA3:17 pmIdaho Falls Fanning Field
17h 18m
2 stops
LHR3:35 pmLondon Heathrow
Sep 11
LHR6:30 amLondon Heathrow
18h 47m
2 stops
IDA6:17 pmIdaho Falls Fanning Field
$1,022
Delta
Sep 5
IDA6:00 amIdaho Falls Fanning Field
18h 10m
2 stops
LHR7:10 amLondon Heathrow
Sep 12
LHR12:25 pmLondon Heathrow
16h 57m
2 stops
IDA10:22 pmIdaho Falls Fanning Field
$1,102
Delta
Sep 4
IDA3:17 pmIdaho Falls Fanning Field
11h 43m
1 stop
LHR10:00 amLondon Heathrow
Sep 12
LHR10:55 amLondon Heathrow
18h 27m
1 stop
IDA10:22 pmIdaho Falls Fanning Field
$1,180

Alaska Airlines flights from Idaho Falls to London

Our best Alaska Airlines deals on Idaho Falls to London flight tickets
Alaska Airlines
Dec 8
IDA6:15 amIdaho Falls Fanning Field
23h 05m
1 stop
LHR12:20 pmLondon Heathrow
Dec 15
LHR2:45 pmLondon Heathrow
14h 54m
1 stop
IDA10:39 pmIdaho Falls Fanning Field
$887
Alaska Airlines
Oct 16
IDA1:46 pmIdaho Falls Fanning Field
18h 19m
1 stop
LHR3:05 pmLondon Heathrow
Nov 3
LHR2:45 pmLondon Heathrow
31h 32m
1 stop
IDA3:17 pmIdaho Falls Fanning Field
$942
Alaska Airlines
Sep 6
IDA6:18 amIdaho Falls Fanning Field
25h 47m
1 stop
LHR3:05 pmLondon Heathrow
Sep 10
LHR5:00 pmLondon Heathrow
29h 20m
1 stop
IDA3:20 pmIdaho Falls Fanning Field
$1,076

momondo Fare Finder

 
Customize your flight search to find flights from Idaho Falls to London 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 15, 2026.
Use the filters below to find and compare flights from Idaho Falls to London 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

Tue 12/8

6:15 am-12:20 pm

1 stop23h 05m

London Heathrow

Tue 12/15

2:45 pm-10:39 pm

1 stop14h 54m

$887

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

$897

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 11/11

6:00 am-10:00 am

1 stop21h 00m

London Heathrow

Wed 11/18

8:25 pm-6:14 pm

2 stops28h 49m

$904

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 11/11

1:10 pm-1:45 pm

2 stops17h 35m

London Heathrow

Wed 11/18

5:50 pm-6:14 pm

2 stops31h 24m

$908
Quickest round-trip

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

1:39 pm-10:55 am

1 stop14h 16m

London Heathrow

Tue 10/13

12:55 pm-9:42 pm

1 stop15h 47m

$934

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 12/8

2:35 pm-9:40 am

1 stop12h 05m

London Heathrow

Tue 12/15

7:30 am-9:08 pm

2 stops20h 38m

$937

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 10/7

10:35 am-11:35 am

2 stops18h 00m

London Heathrow

Tue 10/13

9:30 am-5:16 pm

2 stops38h 46m

$940

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 12/8

10:45 am-10:50 am

2 stops17h 05m

London Heathrow

Tue 12/15

7:30 am-5:22 pm

2 stops16h 52m

$941

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 10/16

1:46 pm-3:05 pm

1 stop18h 19m

London Heathrow

Tue 11/3

2:45 pm-3:17 pm

1 stop31h 32m

$942

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 12/8

10:45 am-10:50 am

2 stops17h 05m

London Heathrow

Tue 12/15

7:30 am-5:22 pm

2 stops16h 52m

$943

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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

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 flights?

You could potentially save up to 20% on your flight if you consider stops on a Idaho Falls to London flight.

When to book flights from Idaho Falls to London

Are you open to changing your travel dates? Check out the ideal times to fly from Idaho Falls to London according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Idaho Falls to London (IDA to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Idaho Falls to London

Fastest flight time

13h 21m

Direct flights

None
The fastest flight from Idaho Falls to London takes 13h 21m
There are no direct flights from Idaho Falls to London. There are no popular flight routes from Idaho Falls to London.
Search flight deals

Frequently asked questions about flying from Idaho Falls to London

  • How far is Idaho Falls Fanning Field to London by plane?

    A flight from Idaho Falls Fanning Field to London will travel around 4715.6 mi. Flights usually cover this in 13h 21m, 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?

    Prices for flights from Idaho Falls Fanning Field Airport to London are updated daily.

  • How old do you have to be to fly from Idaho Falls Fanning Field Airport to London?

    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.

  • What documentation or ID do you need to fly to London?

    The necessary travel and health documents for your London 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
Hayes
Dover
Crawley
Wembley
Croydon
Stansted
Slough
Harrow
Kingston upon Thames
Watford
Brentwood
Ilford
Cobham
Folkestone
Guildford
Romford

Why use momondo?

Why should I use momondo to find a flight deal from Idaho Falls to London?

It is quick and easy to find Idaho Falls to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits 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?

Price alerts on flights to London from Idaho Falls are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport