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$568+ Cheap flights from London (LON) to Idaho

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
Jun 8 — Jun 151
Mon 6/8
Mon 6/15
1 adult, Economy
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Cheap flight deals from London to Idaho

Cheapest flights from London to Idaho
Explore the most affordable flight options available from London to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 9, 2026.

This Trip.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/291:05 pm
LHR
-
BOI
2 stops17h 53m
Multiple Airlines
Fri 6/54:19 pm
BOI
-
LHR
2 stops21h 01m
Multiple Airlines
Deal found 5/5$875
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:40 am
LHR
-
GEG
2 stops20h 36m
United Airlines
Sun 9/201:38 pm
GEG
-
LHR
2 stops34h 07m
United Airlines
Deal found 5/5$889
This United Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:40 am
LHR
-
GEG
2 stops20h 36m
United Airlines
Thu 9/105:00 am
GEG
-
LHR
1 stop23h 25m
United Airlines
Deal found 5/8$892
This United Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:55 am
LHR
-
GEG
2 stops22h 19m
United Airlines
Wed 9/91:38 pm
GEG
-
LHR
1 stop14h 57m
United Airlines
Deal found 5/8$896
This Expedia deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/22:50 pm
LHR
-
GEG
1 stop14h 24m
Lufthansa
Thu 9/101:38 pm
GEG
-
LHR
1 stop14h 47m
Lufthansa
Deal found 5/8$919
This Expedia deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:50 pm
LHR
-
GEG
1 stop14h 24m
Lufthansa
Tue 9/81:38 pm
GEG
-
LHR
1 stop14h 47m
Lufthansa
Deal found 5/8$920
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/301:05 pm
LHR
-
BOI
2 stops17h 47m
United Airlines
Sun 10/47:05 pm
BOI
-
LHR
1 stop29h 20m
United Airlines
Deal found 5/5$926
This The Travel House deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:00 pm
LGW
-
GEG
2 stops18h 59m
Icelandair
Wed 9/912:30 pm
GEG
-
LGW
2 stops15h 15m
Icelandair
Deal found 5/8$955
This The Travel House deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/23:40 pm
LGW
-
GEG
2 stops16h 19m
Icelandair
Thu 9/108:39 pm
GEG
-
LGW
2 stops55h 06m
Icelandair
Deal found 5/8$981
This Cheapflightsfares deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:30 am
LHR
-
BOI
2 stops18h 26m
Lufthansa
Wed 6/1012:30 pm
BOI
-
LHR
1 stop16h 25m
Lufthansa
Deal found 5/6$1,021
This Cheapflightsfares deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/238:30 am
LHR
-
BOI
2 stops21h 26m
Lufthansa
Tue 6/3010:20 am
BOI
-
LHR
1 stop16h 20m
Lufthansa
Deal found 5/5$1,022
This Cheapflightsfares deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/227:30 am
LHR
-
GEG
2 stops23h 44m
Lufthansa
Mon 6/291:41 pm
GEG
-
LHR
1 stop14h 44m
Lufthansa
Deal found 5/8$1,024

Find flight deals from London to Idaho

Keep the following information in mind while searching for London to Idaho flight deals. Data was last updated May 9, 2026.

Round-trip from

$875
(Trip.com)

One-way from

$568
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$908
From London (LON) to Idaho
Search Deals
One-way flight from London (LON) to Idaho
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Idaho 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, Cheapflights users made 2,558,603 searches. Data last updated May 9, 2026.
Use the filters below to find and compare flights from London to Idaho that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 9/16

8:40 am-10:35 am

2 stops33h 55m

Spokane

Sun 9/20

12:57 pm-7:25 am

1 stop34h 28m

$889

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 9/8

8:45 am-9:16 pm

2 stops20h 31m

Spokane

Wed 9/16

5:00 am-11:35 am

2 stops22h 35m

$892

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 9/30

1:05 pm-11:52 pm

2 stops17h 47m

Boise Air Term. Gowen Fld

Sun 10/4

7:05 pm-7:25 am

1 stop29h 20m

$926

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Tue 9/1

1:00 pm-11:59 pm

2 stops18h 59m

Spokane

Wed 9/9

12:30 pm-11:45 am

2 stops15h 15m

$955

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 6/23

11:25 am-9:35 pm

1 stop17h 10m

Boise Air Term. Gowen Fld

Sun 7/5

5:46 pm-9:40 am

1 stop32h 54m

$1,053

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 6/15

6:55 am-6:39 pm

2 stops19h 44m

Spokane

Mon 6/29

4:18 pm-9:25 pm

2 stops21h 07m

$1,056

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 6/22

7:30 am-9:40 pm

2 stops21h 10m

Boise Air Term. Gowen Fld

Mon 6/29

10:35 am-10:10 am

2 stops16h 35m

$1,059

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Tue 9/1

9:25 pm-10:56 pm

2 stops32h 31m

Idaho Falls Fanning Field

Fri 9/25

6:18 am-11:55 am

2 stops22h 37m

$1,074

LondonSpokane

LCY - GEG

LCYGEG

London City

Wed 9/2

9:15 am-10:36 pm

2 stops21h 21m

Spokane

Thu 9/10

1:38 pm-5:55 pm

2 stops20h 17m

$1,079

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Thu 6/11

10:20 am-8:56 pm

2 stops18h 36m

Spokane

Wed 6/24

1:26 pm-6:45 pm

2 stops21h 19m

$1,080

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/6

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from London to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from London with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Idaho

How far ahead should I book a flight from London to Idaho?

Booking 82 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Idaho. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London to Idaho?

Currently, January is the cheapest month in which you can book a flight from London to Idaho (average of $673). Flying from London to Idaho in July is currently the most expensive (average of $855). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from London to Idaho?

Related info for your journey

Find useful and relevant information for your journey from London to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London to Idaho?

    A quick flight from London to Idaho can take about 17h 10m. United Airlines provides one of the quickest options available for as low as $1,053. Airlines will cover a distance of 4829 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the most popular routes from London to Idaho?

    When deciding which route to take from London to Idaho consider London Heathrow - Spokane, London Gatwick - Spokane or London Heathrow - Idaho Falls Fanning Field as they are the most popular.

  • Can I find deals for flights from London to Idaho that include hotel bookings?

    Yes. In addition to deals on London to Idaho flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from London to Idaho?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Idaho.

  • Can I find deals for business class flights from London to Idaho?

    Yes. Cheapflights offers flight deals from London to Idaho by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London to Idaho?

    Currently, January is the cheapest month in which you can book a flight from London to Idaho (average of $673). Flying from London to Idaho in July is currently the most expensive (average of $855). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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