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$389+ 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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Cheap 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 December 4, 2025.

This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/98:20 amLHR - GEG
1 stop16h 20mAmerican Airlines
Sun 12/141:14 pmGEG - LHR
1 stop35h 01mAmerican Airlines
Deal found 12/2$780
This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/112:10 pmLHR - GEG
1 stop30h 20mAmerican Airlines
Sun 12/141:14 pmGEG - LHR
1 stop35h 01mAmerican Airlines
Deal found 12/2$819
This Travcart deal was found by Cheapflights users on 12/2. 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 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 stop17h 06mFinnair
Deal found 12/2$862
This Travcart deal was found by Cheapflights users on 12/2. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/910:15 amLHR - BOI
1 stop19h 10mMultiple Airlines
Mon 12/156:44 amBOI - LHR
1 stop17h 06mMultiple Airlines
Deal found 12/2$867
This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/122:10 pmLHR - GEG
1 stop30h 20mAmerican Airlines
Sun 12/141:14 pmGEG - LHR
1 stop35h 01mAmerican Airlines
Deal found 12/2$895
This deal was found by Cheapflights users on 12/2. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/911:35 amLHR - BOI
1 stop15h 08mUnited Airlines
Mon 12/152:49 pmBOI - LHR
1 stop11h 51mUnited Airlines
Deal found 12/2$916
This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/98:20 amLHR - GEG
1 stop16h 20mAmerican Airlines
Mon 12/153:05 pmGEG - LHR
1 stop14h 10mAmerican Airlines
Deal found 12/2$948
This Air France deal was found by Cheapflights users on 12/4. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:20 pmLHR - GEG
1 stop35h 26mAir France
Wed 1/76:30 amGEG - LHR
1 stop16h 35mAir France
Deal found 12/4$984
This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/98:20 amLHR - GEG
1 stop16h 20mAmerican Airlines
Tue 12/165:17 amGEG - LHR
1 stop19h 18mAmerican Airlines
Deal found 12/2$985
This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/118:20 amLHR - GEG
1 stop20h 37mAmerican Airlines
Mon 12/153:05 pmGEG - LHR
1 stop14h 10mAmerican Airlines
Deal found 12/2$987
This Justfly.com deal was found by Cheapflights users on 12/2. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:55 amLHR - BOI
1 stop17h 30mFinnair
Mon 12/156:44 amBOI - LHR
1 stop17h 06mFinnair
Deal found 12/2$1,001
This Justfly.com deal was found by Cheapflights users on 12/2. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:35 pmLHR - BOI
2 stops32h 10mMultiple Airlines
Mon 12/155:45 amBOI - LHR
2 stops22h 05mMultiple Airlines
Deal found 12/2$1,023

Find flight deals from Heathrow to Idaho

Keep the following information in mind while searching for Heathrow to Idaho flight deals. Data was last updated December 4, 2025.

Round-trip from

$671
(United Airlines)

One-way from

$389
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$1,489
From London Heathrow to Idaho
Search Deals
One-way flight from London Heathrow to Idaho
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($109 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 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 December 4, 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 2/2

7:40 am-7:16 pm

2 stops19h 36m

Spokane

Wed 2/11

11:25 am-11:15 am

1 stop15h 50m

$671

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

6:35 am-9:18 pm

2 stops21h 43m

Spokane

Tue 3/17

7:02 am-9:40 am

2 stops19h 38m

$671

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 2/27

11:10 am-11:48 pm

2 stops19h 38m

Boise Air Term. Gowen Fld

Mon 3/9

2:40 pm-9:40 am

1 stop13h 00m

$671

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 2/20

6:30 am-8:55 pm

2 stops21h 25m

Boise Air Term. Gowen Fld

Mon 3/2

10:53 am-7:25 am

1 stop13h 32m

$672

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 2/11

6:30 am-7:51 pm

2 stops20h 21m

Boise Air Term. Gowen Fld

Sun 2/15

8:41 am-7:25 am

1 stop15h 44m

$672

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 3/11

8:30 am-9:03 pm

2 stops19h 33m

Spokane

Wed 3/18

12:41 pm-1:30 pm

2 stops17h 49m

$673

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

6:30 am-9:18 pm

2 stops21h 48m

Spokane

Wed 3/25

6:00 am-6:40 am

2 stops17h 40m

$673

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Fri 1/16

1:30 pm-10:44 am

2 stops29h 14m

Spokane

Fri 1/23

12:24 pm-7:25 am

1 stop35h 01m

$673

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 3/12

6:35 am-9:18 pm

2 stops21h 43m

Spokane

Mon 3/23

5:00 am-11:15 am

2 stops23h 15m

$673

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

7:30 am-9:18 pm

2 stops20h 48m

Spokane

Tue 3/24

12:42 pm-7:25 am

1 stop35h 43m

$673

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/2

Showing 1-10 of 55 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.

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

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 Delta can get you from London Heathrow Airport to Idaho in just under 19h 33m. Your travel time can differ by up to 3h 40m. London Heathrow Airport and Idaho are separated by 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 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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