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$441+ Cheap flights from Heathrow (LHR) 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
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Cheap flight deals from Heathrow to Idaho

Keep the following information in mind while searching for Heathrow to Idaho flight deals. Data was last updated November 26, 2025.

Round-trip from

$661
(Expedia)

One-way from

$441
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$850
From London Heathrow to Idaho
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One-way flight from London Heathrow to Idaho
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Highest demand for flights based on searches. 7% potential increase in price ($81 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Heathrow to Idaho

Cheapest flights from Heathrow to Idaho
Explore the most affordable flight options available from Heathrow to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 26, 2025.

This American Airlines deal was found by Cheapflights users on 11/25. 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.
Wed 12/108:20 amLHR - GEG
1 stop16h 20mMultiple Airlines
Tue 3/101:23 pmGEG - LHR
1 stop15h 57mMultiple Airlines
Deal found 11/25$804
This KLM deal was found by Cheapflights users on 11/25. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:30 amLHR - GEG
2 stops16h 25mKLM
Tue 3/1012:40 pmGEG - LHR
1 stop16h 00mKLM
Deal found 11/25$871
This Travcart deal was found by Cheapflights users on 11/25. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/911:55 amLHR - BOI
1 stop17h 30mFinnair
Sun 12/146:44 amBOI - LHR
1 stop20h 16mFinnair
Deal found 11/25$881
This American Airlines deal was found by Cheapflights users on 11/26. 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.
Mon 12/88:20 amLHR - BOI
1 stop21h 05mMultiple Airlines
Mon 12/154:20 pmBOI - LHR
1 stop12h 00mMultiple Airlines
Deal found 11/26$907
This Travcart deal was found by Cheapflights users on 11/25. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/92:45 pmLHR - BOI
1 stop14h 31mVirgin Atlantic
Mon 12/151:54 pmBOI - LHR
1 stop15h 56mVirgin Atlantic
Deal found 11/25$913
This Travcart deal was found by Cheapflights users on 11/24. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/82:45 pmLHR - BOI
1 stop35h 06mVirgin Atlantic
Tue 12/162:04 pmBOI - LHR
1 stop33h 21mVirgin Atlantic
Deal found 11/24$920
This ChecknFly deal was found by Cheapflights users on 11/25. 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 ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/910:05 amLHR - BOI
1 stop32h 29mLufthansa
Sun 12/147:11 pmBOI - LHR
2 stops29h 44mLufthansa
Deal found 11/25$926
This Icelandair deal was found by Cheapflights users on 11/24. 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.
Tue 12/912:15 pmLHR - BOI
2 stops16h 30mMultiple Airlines
Mon 12/1511:45 amBOI - LHR
2 stops16h 05mMultiple Airlines
Deal found 11/24$934
This ChecknFly deal was found by Cheapflights users on 11/24. 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 ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/910:05 amLHR - BOI
1 stop20h 39mLufthansa
Mon 12/157:11 pmBOI - LHR
2 stops19h 09mLufthansa
Deal found 11/24$936
This Delta deal was found by Cheapflights users on 11/25. 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.
Tue 12/235:35 pmLHR - GEG
2 stops30h 38mDelta
Mon 1/127:25 pmGEG - LHR
1 stop31h 05mDelta
Deal found 11/25$940
This United Airlines deal was found by Cheapflights users on 11/24. 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
Mon 12/1512:16 pmBOI - LHR
1 stop12h 39mUnited Airlines
Deal found 11/24$944
This United Airlines deal was found by Cheapflights users on 11/24. 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 40mUnited Airlines
Deal found 11/24$950

Cheapflights Fare Finder

 
Customize your flight search to find flights from Heathrow 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 26, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Idaho that are best for you.

Fly from

Heathrow

Fly to

Idaho

Route

Depart

Return

Price

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 5/4

8:45 am-11:38 pm

2 stops22h 53m

Spokane

Sun 5/10

7:02 am-11:10 am

1 stop20h 08m

$680

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 3/4

6:35 am-6:03 pm

2 stops19h 28m

Spokane

Tue 3/17

1:43 pm-9:40 am

1 stop12h 57m

$732

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/3

8:30 am-9:17 pm

2 stops20h 47m

Spokane

Tue 3/17

12:42 pm-1:30 pm

2 stops17h 48m

$733

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

6:35 am-9:03 pm

2 stops21h 28m

Spokane

Tue 3/17

6:00 am-6:20 am

2 stops17h 20m

$733

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 2/9

6:30 am-7:51 pm

2 stops20h 21m

Boise Air Term. Gowen Fld

Thu 2/19

8:00 am-11:15 am

1 stop20h 15m

$734

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 3/4

9:30 am-9:07 pm

2 stops19h 37m

Spokane

Mon 3/16

1:43 pm-5:05 pm

2 stops20h 22m

$737

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 2/9

7:30 am-6:07 pm

2 stops17h 37m

Boise Air Term. Gowen Fld

Mon 2/16

2:40 pm-2:45 pm

2 stops17h 05m

$739

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 2/11

6:35 am-12:42 pm

2 stops38h 07m

Spokane

Sun 2/15

12:38 pm-7:25 am

1 stop34h 47m

$743

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

6:55 am-10:35 pm

2 stops22h 40m

Boise Air Term. Gowen Fld

Mon 4/27

6:15 am-9:40 am

1 stop20h 25m

$750

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/3

7:25 am-6:03 pm

1 stop18h 38m

Spokane

Thu 3/12

5:00 am-7:10 am

2 stops19h 10m

$764

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/25

Showing 1-10 of 41 results
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Best time to book a flight from Heathrow to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from Heathrow 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 Heathrow Airport to Idaho

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

Currently, May is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of $722). Flying from London Heathrow Airport to Idaho in December is currently the most expensive (average of $912). 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 Heathrow 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 Heathrow Airport to Idaho?

    United Airlines, Lufthansa, and American Airlines can get you from London Heathrow Airport to Idaho in just under 17h 37m. Your travel time can differ by up to 5h 16m. London Heathrow Airport and Idaho are separated by a distance of 4829 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    $666 is the cheapest one-way deal found within the past few days, from Lufthansa. You may also be able to find cheap deals on United Airlines and American Airlines, with prices starting from $683 and $1,654, respectively.

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

    While some choose either London Heathrow - Spokane or London Heathrow - Hailey Sun Valley-Friedman, London Heathrow - Boise Air Term. Gowen Fld is the most popular route from London Heathrow Airport to Idaho.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow 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 Heathrow Airport to Idaho?

    Currently, May is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of $722). Flying from London Heathrow Airport to Idaho in December is currently the most expensive (average of $912). 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 Heathrow to Idaho

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