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$369+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
Dec 2 — Dec 91
Tue 12/2
Tue 12/9
1 adult, Economy
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Find 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 November 2, 2025.

This United Airlines deal was found by Cheapflights users on 11/1. 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.
Mon 12/87:40 amLHR - BOI
2 stops33h 19mUnited Airlines
Mon 12/159:40 amBOI - LHR
2 stops18h 35mUnited Airlines
Deal found 11/1$725
This United Airlines deal was found by Cheapflights users on 10/31. 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 12/36:35 amLHR - GEG
2 stops22h 24mUnited Airlines
Mon 12/155:25 amGEG - LHR
2 stops21h 25mUnited Airlines
Deal found 10/31$727
This United Airlines deal was found by Cheapflights users on 11/1. 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 12/96:35 amLHR - BOI
2 stops18h 32mUnited Airlines
Sun 12/1412:16 pmBOI - LHR
1 stop34h 39mUnited Airlines
Deal found 11/1$736
This The Travel House deal was found by Cheapflights users on 11/1. 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 12/97:40 amLHR - BOI
2 stops17h 27mLufthansa
Sun 12/142:49 pmBOI - LHR
2 stops37h 01mLufthansa
Deal found 11/1$747
This Expedia deal was found by Cheapflights users on 10/31. 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 12/311:55 amLGW - GEG
2 stops17h 33mMultiple Airlines
Mon 12/157:25 pmGEG - LGW
2 stops31h 30mMultiple Airlines
Deal found 10/31$873
This Expedia deal was found by Cheapflights users on 11/2. 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.
Mon 11/1011:55 amLGW - GEG
2 stops16h 06mMultiple Airlines
Mon 11/249:09 pmGEG - LGW
2 stops29h 46mMultiple Airlines
Deal found 11/2$896
This Icelandair deal was found by Cheapflights users on 11/1. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:55 amLGW - BOI
2 stops16h 50mMultiple Airlines
Tue 12/1611:45 amBOI - LGW
2 stops16h 10mMultiple Airlines
Deal found 11/1$937
This Icelandair deal was found by Cheapflights users on 11/1. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1111:55 amLGW - BOI
2 stops18h 15mMultiple Airlines
Fri 1/99:02 amBOI - LGW
2 stops18h 53mMultiple Airlines
Deal found 11/1$943
This Justfly.com deal was found by Cheapflights users on 10/31. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:55 amLGW - BOI
2 stops31h 50mMultiple Airlines
Mon 12/154:20 pmBOI - LGW
2 stops35h 35mMultiple Airlines
Deal found 10/31$947
This Netflights deal was found by Cheapflights users on 11/1. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/87:45 amLCY - BOI
2 stops23h 24mVirgin Atlantic
Mon 12/155:35 amBOI - LCY
2 stops28h 45mVirgin Atlantic
Deal found 11/1$962
This The Travel House deal was found by Cheapflights users on 11/1. 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 12/89:50 amLCY - BOI
2 stops39h 17mLufthansa
Tue 12/1612:16 pmBOI - LCY
2 stops22h 19mLufthansa
Deal found 11/1$966
This United Airlines deal was found by Cheapflights users on 10/31. 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 12/36:10 pmLCY - GEG
3 stops32h 34mMultiple Airlines
Mon 12/155:25 amGEG - LCY
3 stops23h 30mMultiple Airlines
Deal found 10/31$971

Cheap flight deals from London to Idaho

Keep the following information in mind while searching for London to Idaho flight deals. Data was last updated November 2, 2025.

Round-trip from

$703
(Trip.com)

One-way from

$369
(Kiwi.com)

Popular in

July

Cheapest in

September

Average price

$860
From London (LON) to Idaho
Search Deals
One-way flight from London (LON) to Idaho
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($160 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 November 2, 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

Tue 12/9

6:35 am-6:07 pm

2 stops18h 32m

Boise Air Term. Gowen Fld

Mon 12/15

1:50 pm-1:30 pm

1 stop16h 40m

$725

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 12/8

7:40 am-9:59 am

2 stops33h 19m

Boise Air Term. Gowen Fld

Mon 12/15

9:40 am-11:15 am

2 stops18h 35m

$725

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 12/3

6:35 am-12:45 pm

2 stops38h 10m

Spokane

Mon 12/15

5:25 am-9:40 am

1 stop20h 15m

$727

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

6:35 am-9:20 pm

2 stops21h 45m

Spokane

Tue 3/17

5:00 am-5:55 am

2 stops17h 55m

$733

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 12/9

6:35 am-6:07 pm

2 stops18h 32m

Boise Air Term. Gowen Fld

Sun 12/14

12:16 pm-5:55 am

1 stop34h 39m

$736

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

7:25 am-7:16 pm

2 stops18h 51m

Boise Air Term. Gowen Fld

Thu 4/30

7:00 am-7:40 am

2 stops17h 40m

$750

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 4/21

10:50 am-11:05 pm

2 stops19h 15m

Boise Air Term. Gowen Fld

Tue 4/28

10:39 am-11:10 am

2 stops17h 31m

$750

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Tue 3/10

11:55 am-8:59 pm

2 stops16h 04m

Spokane

Tue 3/17

12:00 pm-10:55 am

2 stops15h 55m

$770

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Mon 4/20

3:40 pm-10:21 pm

2 stops37h 41m

Boise Air Term. Gowen Fld

Mon 4/27

5:30 pm-2:40 pm

2 stops38h 10m

$820

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Mon 2/9

11:55 am-11:01 pm

2 stops18h 06m

Boise Air Term. Gowen Fld

Tue 2/17

6:28 am-10:55 am

2 stops21h 27m

$856

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/1

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, May is the cheapest month in which you can book a flight from London to Idaho (average of $723). Flying from London to Idaho in July is currently the most expensive (average of $905). 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 16h 04m. United Airlines provides one of the quickest options available for as low as $770. Airlines will cover a distance of 4667 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from London to Idaho one-way?

    $635 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on KLM and Virgin Atlantic, with prices starting from $898 and $915, respectively.

  • 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, May is the cheapest month in which you can book a flight from London to Idaho (average of $723). Flying from London to Idaho in July is currently the most expensive (average of $905). 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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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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