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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 10/15. 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

Delta Logo
6:00 am - 9:50 amIDA-LHR
20h 50m1 stop
Delta Logo
6:15 am - 10:15 pmLHR-IDA
23h 00m2 stops
$613Delta
Find Deal
Mon, Sep 22 - Tue, Oct 7
Delta Logo
6:51 pm - 9:50 amIDA-LHR
31h 59m1 stop
Delta Logo
10:55 am - 12:33 pmLHR-IDA
32h 38m1 stop
$621Delta
Find Deal
Mon, Sep 22 - Tue, Oct 7
Delta Logo
6:00 am - 8:05 amIDA-LHR
19h 05m2 stops
Delta Logo
6:20 am - 10:21 pmLHR-IDA
23h 01m2 stops
$688Delta
Find Deal
Thu, Feb 5 - Fri, Feb 13
Delta Logo
1:06 pm - 1:10 pmIDA-LHR
17h 04m2 stops
Delta Logo
11:45 am - 10:30 pmLHR-IDA
17h 45m2 stops
$745Delta
Find Deal
Sat, Oct 4 - Sat, Oct 11
United Airlines Logo
2:35 pm - 9:40 amIDA-LHR
12h 05m1 stop
United Airlines Logo
6:30 am - 9:08 pmLHR-IDA
21h 38m2 stops
$789United Airlines
Find Deal
Thu, Feb 5 - Fri, Feb 13
Logo
1:44 pm - 12:15 pmIDA-LHR
15h 31m1 stop
Logo
2:25 pm - 9:57 pmLHR-IDA
14h 32m1 stop
$801
Find Deal
Thu, Feb 5 - Fri, Feb 13
Delta Logo
6:05 am - 8:45 amIDA-LHR
19h 40m2 stops
Delta Logo
10:45 am - 10:20 pmLHR-IDA
18h 35m1 stop
$826Delta
Find Deal
Thu, Dec 11 - Sun, Dec 21
Logo
4:15 pm - 1:40 pmIDA-LHR
14h 25m1 stop
Logo
8:20 am - 9:48 pmLHR-IDA
20h 28m1 stop
$851
Find Deal
Sat, Oct 4 - Sat, Oct 11
Logo
4:15 pm - 1:40 pmIDA-LHR
14h 25m1 stop
Logo
9:15 am - 9:48 pmLHR-IDA
19h 33m2 stops
$855
Find Deal
Sat, Oct 4 - Sat, Oct 11
United Airlines Logo
7:00 am - 6:40 amIDA-LHR
16h 40m2 stops
United Airlines Logo
4:20 pm - 9:56 amLHR-IDA
24h 36m2 stops
$856United Airlines
Find Deal
Thu, Dec 11 - Sun, Dec 21

United Airlines flights from Idaho Falls to London

Our best United Airlines deals on Idaho Falls to London flight tickets
United Airlines
Feb 5
IDA2:35 pmIdaho Falls Fanning Field
12h 05m
1 stop
LHR9:40 amLondon Heathrow
Feb 13
LHR6:30 amLondon Heathrow
21h 38m
2 stops
IDA9:08 pmIdaho Falls Fanning Field
$789
Find similar
United Airlines
Dec 11
IDA7:00 amIdaho Falls Fanning Field
16h 40m
2 stops
LHR6:40 amLondon Heathrow
Dec 21
LHR4:20 pmLondon Heathrow
24h 36m
2 stops
IDA9:56 amIdaho Falls Fanning Field
$856
Find similar

Delta flights from Idaho Falls to London

Our best Delta deals on Idaho Falls to London flight tickets
Delta
Sep 22
IDA6:00 amIdaho Falls Fanning Field
20h 50m
1 stop
LHR9:50 amLondon Heathrow
Oct 7
LHR6:15 amLondon Heathrow
23h 00m
2 stops
IDA10:15 pmIdaho Falls Fanning Field
$613
Find similar
Delta
Sep 22
IDA6:51 pmIdaho Falls Fanning Field
31h 59m
1 stop
LHR9:50 amLondon Heathrow
Oct 7
LHR10:55 amLondon Heathrow
32h 38m
1 stop
IDA12:33 pmIdaho Falls Fanning Field
$621
Find similar
Delta
Feb 5
IDA6:00 amIdaho Falls Fanning Field
19h 05m
2 stops
LHR8:05 amLondon Heathrow
Feb 13
LHR6:20 amLondon Heathrow
23h 01m
2 stops
IDA10:21 pmIdaho Falls Fanning Field
$688
Find similar

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 August 21, 2025.
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

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 9/22

6:00 am-9:50 am

1 stop20h 50m

London Heathrow

Tue 10/7

6:15 am-10:15 pm

2 stops23h 00m

$613

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 9/22

6:51 pm-9:50 am

1 stop31h 59m

London Heathrow

Tue 10/7

10:55 am-12:33 pm

1 stop32h 38m

$621

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 2/5

6:00 am-8:05 am

2 stops19h 05m

London Heathrow

Fri 2/13

6:20 am-10:21 pm

2 stops23h 01m

$688

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sat 10/4

1:06 pm-1:10 pm

2 stops17h 04m

London Heathrow

Sat 10/11

11:45 am-10:30 pm

2 stops17h 45m

$745

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 2/5

2:35 pm-9:40 am

1 stop12h 05m

London Heathrow

Fri 2/13

6:30 am-9:08 pm

2 stops21h 38m

$789

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 2/5

1:44 pm-12:15 pm

1 stop15h 31m

London Heathrow

Fri 2/13

2:25 pm-9:57 pm

1 stop14h 32m

$801

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 12/11

6:05 am-8:45 am

2 stops19h 40m

London Heathrow

Sun 12/21

10:45 am-10:20 pm

1 stop18h 35m

$826

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sat 10/4

4:15 pm-1:40 pm

1 stop14h 25m

London Heathrow

Sat 10/11

8:20 am-9:48 pm

1 stop20h 28m

$851

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sat 10/4

4:15 pm-1:40 pm

1 stop14h 25m

London Heathrow

Sat 10/11

9:15 am-9:48 pm

2 stops19h 33m

$855

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 12/11

7:00 am-6:40 am

2 stops16h 40m

London Heathrow

Sun 12/21

4:20 pm-9:56 am

2 stops24h 36m

$856

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

What is the typical price of a round-trip flight between Idaho Falls and London?

What is the cheapest day to depart on your flight to London?

The cheapest day to depart from Idaho Falls to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $914. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $1,486. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

What is the cheapest time of day to depart on your flight to London?

Flying to London from Idaho Falls in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $914 when looking at flights departing in the afternoon. Flights to London are more costly in the morning, with an average ticket price of $1,424. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

Direct flights

None
There are no direct flights from Idaho Falls to London. There are no popular flight routes from Idaho Falls to London.
Search flight deals

  • 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 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?

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

  • How many operators does momondo search for flights from Idaho Falls Fanning Field Airport to London?

  • 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.

  • What is the most popular airline from Idaho Falls to London?

Best airlines flying from Idaho Falls to London

Compare and see reviews for airlines that fly from Idaho Falls to London with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $699Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Luton
Dover
Slough
Milton Keynes
Guildford
Dartford
Crawley
Hayes
Chelmsford
Stansted
Brentwood
Ilford
Folkestone
Colchester
Watford
Richmond
Canterbury
Croydon

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