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$492+ 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 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/206:30 amLHR - BOI
2 stops21h 56mLufthansa
Mon 12/2210:42 amBOI - LHR
1 stop15h 58mLufthansa
Deal found 12/16$1,800
This Ovago deal was found by Cheapflights users on 12/16. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2010:15 amLHR - BOI
1 stop18h 47mIberia
Mon 12/227:00 amBOI - LHR
1 stop20h 00mIberia
Deal found 12/16$1,831
This Delta deal was found by Cheapflights users on 12/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:45 amLHR - SUN
1 stop14h 17mDelta
Wed 2/187:25 amSUN - LHR
2 stops18h 20mDelta
Deal found 12/16$1,869
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/217:10 pmLHR - SUN
2 stops24h 26mAmerican Airlines
Wed 2/187:46 amSUN - LHR
2 stops16h 04mAmerican Airlines
Deal found 12/16$1,884
This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2311:35 amLHR - GEG
1 stop17h 23mLufthansa
Fri 12/266:00 amGEG - LHR
1 stop22h 00mLufthansa
Deal found 12/17$2,264
This United Airlines deal was found by Cheapflights users on 12/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:35 amLHR - GEG
2 stops22h 56mUnited Airlines
Fri 12/266:00 amGEG - LHR
1 stop17h 25mUnited Airlines
Deal found 12/17$2,413
This Air Canada deal was found by Cheapflights users on 12/16. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/206:00 pmLHR - BOI
2 stops25h 39mMultiple Airlines
Mon 12/2210:42 amBOI - LHR
3 stops17h 38mMultiple Airlines
Deal found 12/16$4,980
This Cathay Pacific deal was found by Cheapflights users on 12/17. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:35 amLHR - GEG
3 stops44h 17mMultiple Airlines
Fri 12/265:41 pmGEG - LHR
2 stops37h 19mMultiple Airlines
Deal found 12/17$13,169

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 December 18, 2025.

Round-trip from

$655
(Trip.com)

One-way from

$492
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$1,489
From London (LON) to Idaho
Search Deals
One-way flight from London (LON) to Idaho
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 December 18, 2025.
Use the filters below to find and compare flights from London to Idaho that are best for you.

Fly from

London

Fly to

Idaho

Route

Depart

Return

Price

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sat 1/31

12:15 pm-11:01 pm

2 stops17h 46m

Boise Air Term. Gowen Fld

Sat 2/7

9:02 am-10:50 am

2 stops18h 48m

$655

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 3/10

6:35 am-9:29 pm

2 stops20h 54m

Boise Air Term. Gowen Fld

Tue 3/31

2:40 pm-5:05 pm

2 stops19h 25m

$739

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

6:35 am-9:18 pm

2 stops21h 43m

Spokane

Tue 3/17

6:00 am-6:20 am

2 stops17h 20m

$746

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

4:35 pm-9:12 pm

2 stops35h 37m

Spokane

Tue 3/17

6:00 am-8:15 am

1 stop19h 15m

$747

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

9:00 am-10:35 pm

2 stops20h 35m

Boise Air Term. Gowen Fld

Mon 4/27

7:11 am-10:10 am

1 stop19h 59m

$762

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 3/18

11:10 am-9:29 pm

2 stops40h 19m

Boise Air Term. Gowen Fld

Tue 5/19

8:20 am-11:10 am

1 stop19h 50m

$765

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 5/4

8:45 am-11:09 am

2 stops34h 24m

Spokane

Sun 5/10

7:00 am-9:40 am

2 stops42h 40m

$769

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 3/17

1:35 pm-10:56 pm

1 stop15h 21m

Boise Air Term. Gowen Fld

Tue 3/31

10:35 am-9:40 am

1 stop16h 05m

$780

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 3/10

11:35 am-9:29 pm

1 stop15h 54m

Boise Air Term. Gowen Fld

Tue 3/31

2:40 pm-12:20 pm

1 stop14h 40m

$780

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 1/29

6:35 am-7:16 pm

2 stops20h 41m

Spokane

Thu 2/5

6:53 am-12:00 pm

1 stop21h 07m

$786

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 60 results
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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, March is the cheapest month in which you can book a flight from London to Idaho (average of $685). Flying from London to Idaho in February is currently the most expensive (average of $955). 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.

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 20h 54m. Lufthansa provides one of the quickest options available for as low as $739. 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 - Boise Air Term. Gowen Fld, London Heathrow - Hailey Sun Valley-Friedman or London Gatwick - Boise Air Term. Gowen Fld 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, March is the cheapest month in which you can book a flight from London to Idaho (average of $685). Flying from London to Idaho in February is currently the most expensive (average of $955). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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