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$488+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
May 21 — May 281
Thu 5/21
Thu 5/28
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 April 21, 2026.

This Trip.com deal was found by Cheapflights users on 4/17. 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.
Mon 6/13:40 pm
LGW
-
GEG
2 stops16h 19m
Multiple Airlines
Mon 6/81:59 pm
GEG
-
LGW
2 stops16h 41m
Multiple Airlines
Deal found 4/17$877
This United Airlines deal was found by Cheapflights users on 4/16. 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 9/1610:50 am
LHR
-
BOI
2 stops31h 10m
United Airlines
Sun 9/207:01 pm
BOI
-
LHR
1 stop29h 24m
United Airlines
Deal found 4/16$894
This The Travel House deal was found by Cheapflights users on 4/19. 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.
Fri 9/256:40 am
LHR
-
BOI
2 stops20h 38m
Scandinavian Airlines
Sun 10/1112:42 pm
BOI
-
LHR
2 stops20h 18m
Scandinavian Airlines
Deal found 4/19$913
This The Travel House deal was found by Cheapflights users on 4/18. 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.
Mon 5/187:30 pm
LHR
-
BOI
2 stops34h 28m
Scandinavian Airlines
Tue 6/210:39 am
BOI
-
LHR
2 stops24h 51m
Scandinavian Airlines
Deal found 4/18$920
This United Airlines deal was found by Cheapflights users on 4/19. 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 9/307:30 am
LHR
-
BOI
2 stops23h 22m
United Airlines
Sat 10/107:05 pm
BOI
-
LHR
2 stops18h 35m
United Airlines
Deal found 4/19$934
This TravelUp deal was found by Cheapflights users on 4/19. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/302:50 pm
LHR
-
BOI
1 stop13h 41m
Lufthansa
Sat 10/102:31 pm
BOI
-
LHR
1 stop12h 09m
Lufthansa
Deal found 4/19$941
This United Airlines deal was found by Cheapflights users on 4/19. 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.
Fri 9/2510:00 am
LHR
-
BOI
2 stops30h 35m
United Airlines
Sun 10/112:45 pm
BOI
-
LHR
1 stop33h 40m
United Airlines
Deal found 4/19$965
This Scandinavian Airlines deal was found by Cheapflights users on 4/18. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:40 am
LHR
-
GEG
2 stops18h 17m
Scandinavian Airlines
Tue 6/911:19 am
GEG
-
LHR
2 stops20h 41m
Scandinavian Airlines
Deal found 4/18$970
This United Airlines deal was found by Cheapflights users on 4/20. 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 7/16:55 am
LHR
-
BOI
2 stops18h 01m
United Airlines
Wed 9/302:31 pm
BOI
-
LHR
1 stop15h 04m
United Airlines
Deal found 4/20$971
This Cheapflightsfares deal was found by Cheapflights users on 4/20. 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 7/111:25 am
LHR
-
BOI
1 stop13h 31m
Lufthansa
Wed 9/302:31 pm
BOI
-
LHR
1 stop12h 09m
Lufthansa
Deal found 4/20$975
This Trip.com deal was found by Cheapflights users on 4/17. 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.
Mon 6/111:40 am
LHR
-
GEG
1 stop18h 56m
Multiple Airlines
Mon 6/812:46 pm
GEG
-
LHR
1 stop15h 24m
Multiple Airlines
Deal found 4/17$984
This Trip.com deal was found by Cheapflights users on 4/20. 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.
Thu 6/41:05 pm
LHR
-
GEG
2 stops18h 54m
Multiple Airlines
Thu 6/117:56 pm
GEG
-
LHR
2 stops16h 24m
Multiple Airlines
Deal found 4/20$1,000

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 April 21, 2026.

Round-trip from

$877
(Trip.com)

One-way from

$488
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$839
From London (LON) to Idaho
Search Deals
One-way flight from London (LON) to Idaho
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($80 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 April 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 April 21, 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

LGW - GEG

LGWGEG

London Gatwick

Mon 6/1

3:40 pm-11:59 pm

2 stops16h 19m

Spokane

Mon 6/8

1:59 pm-2:40 pm

2 stops16h 41m

$877

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 6/2

6:40 am-4:57 pm

2 stops18h 17m

Spokane

Tue 6/9

11:19 am-4:00 pm

2 stops20h 41m

$970

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 7/1

6:55 am-5:56 pm

2 stops18h 01m

Boise Air Term. Gowen Fld

Wed 9/30

2:31 pm-12:35 pm

1 stop15h 04m

$971

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 9/29

6:40 am-6:35 pm

2 stops18h 55m

Boise Air Term. Gowen Fld

Sat 10/3

12:42 pm-5:40 pm

2 stops21h 58m

$982

LondonBoise

LCY - BOI

LCYBOI

London City

Mon 5/18

10:00 am-11:58 pm

2 stops20h 58m

Boise Air Term. Gowen Fld

Tue 6/2

6:35 am-4:40 pm

2 stops27h 05m

$1,044

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Sat 10/10

1:05 pm-10:16 pm

2 stops17h 11m

Spokane

Mon 10/12

12:50 pm-10:10 am

2 stops37h 20m

$1,045

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 5/26

6:40 am-8:34 pm

2 stops20h 54m

Boise Air Term. Gowen Fld

Fri 6/5

10:39 am-1:35 pm

2 stops19h 56m

$1,046

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 6/3

8:40 am-10:27 am

2 stops33h 47m

Spokane

Wed 6/10

5:00 am-9:40 am

1 stop20h 40m

$1,048

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 6/2

11:05 am-10:51 pm

1 stop18h 46m

Boise Air Term. Gowen Fld

Wed 7/1

2:41 pm-9:40 am

1 stop11h 59m

$1,049

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 6/3

6:55 am-9:40 pm

2 stops21h 45m

Boise Air Term. Gowen Fld

Wed 6/10

10:41 am-10:40 am

2 stops16h 59m

$1,053

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

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

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 18h 17m. United Airlines provides one of the quickest options available for as low as $970. Airlines will cover a distance of 4643 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 - Boise Air Term. Gowen Fld, London Gatwick - Boise Air Term. Gowen Fld or London Heathrow - Spokane 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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