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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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
Nov 16 — Nov 231
Sun 11/16
Sun 11/23
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 October 17, 2025.

Round-trip from

$679
(United Airlines)

One-way from

$441
(Kiwi.com)

Popular in

July

Cheapest in

September

Average price

$973
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. 14% potential increase in price ($157 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 17, 2025.

This United Airlines deal was found by Cheapflights users on 10/14. 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 11/129:00 amLHR - GEG
2 stops22h 29mUnited Airlines
Wed 11/191:47 pmGEG - LHR
2 stops23h 33mUnited Airlines
Deal found 10/14$679
This United Airlines deal was found by Cheapflights users on 10/16. 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.
Mon 11/1712:05 pmLHR - GEG
2 stops43h 24mUnited Airlines
Mon 12/14:05 pmGEG - LHR
1 stop33h 35mUnited Airlines
Deal found 10/16$683
This United Airlines deal was found by Cheapflights users on 10/15. 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 12/156:35 amBOI - LHR
1 stop17h 50mUnited Airlines
Deal found 10/15$683
This United Airlines deal was found by Cheapflights users on 10/17. 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.
Mon 11/178:30 amLHR - BOI
2 stops35h 55mUnited Airlines
Mon 11/242:31 pmBOI - LHR
1 stop12h 09mUnited Airlines
Deal found 10/17$691
This United Airlines deal was found by Cheapflights users on 10/16. 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.
Fri 12/56:30 amLHR - BOI
2 stops22h 56mUnited Airlines
Wed 12/106:35 amBOI - LHR
1 stop17h 50mUnited Airlines
Deal found 10/16$734
This Mytrip deal was found by Cheapflights users on 10/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/12:30 pmLHR - BOI
2 stops40h 14mAir Canada
Mon 12/85:25 pmBOI - LHR
2 stops30h 45mAir Canada
Deal found 10/17$744
This Mytrip deal was found by Cheapflights users on 10/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/12:30 pmLHR - BOI
2 stops40h 14mMultiple Airlines
Mon 12/82:49 pmBOI - LHR
1 stop11h 51mMultiple Airlines
Deal found 10/17$757
This United Airlines deal was found by Cheapflights users on 10/17. 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.
Thu 11/207:30 amLHR - BOI
2 stops22h 15mUnited Airlines
Mon 11/2412:45 pmBOI - LHR
1 stop15h 30mUnited Airlines
Deal found 10/17$758
This United Airlines deal was found by Cheapflights users on 10/16. 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.
Sat 12/66:35 amLHR - GEG
2 stops20h 09mUnited Airlines
Fri 1/1611:25 amGEG - LHR
1 stop12h 30mUnited Airlines
Deal found 10/16$771
This Kiwi.com deal was found by Cheapflights users on 10/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/610:05 amLHR - GEG
1 stop16h 39mLufthansa
Fri 1/1612:24 pmGEG - LHR
1 stop15h 36mLufthansa
Deal found 10/16$802
This Air Canada deal was found by Cheapflights users on 10/16. 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.
Mon 11/171:25 pmLHR - GEG
2 stops31h 20mAir Canada
Mon 12/15:10 amGEG - LHR
2 stops19h 20mAir Canada
Deal found 10/16$826
This United Airlines deal was found by Cheapflights users on 10/16. 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.
Mon 12/16:00 pmLHR - GEG
2 stops34h 59mUnited Airlines
Mon 12/87:00 amGEG - LHR
1 stop21h 00mUnited Airlines
Deal found 10/16$836

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 October 17, 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

Wed 11/12

9:00 am-11:29 pm

2 stops22h 29m

Spokane

Wed 11/19

1:47 pm-9:20 pm

2 stops23h 33m

$679

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 11/17

12:05 pm-11:29 pm

2 stops43h 24m

Spokane

Mon 12/1

4:05 pm-9:40 am

1 stop33h 35m

$683

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

6:35 am-7:25 am

1 stop17h 50m

$683

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-7:10 am

2 stops19h 10m

$688

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 11/17

8:30 am-1:25 pm

2 stops35h 55m

Boise Air Term. Gowen Fld

Mon 11/24

2:31 pm-9:40 am

1 stop12h 09m

$691

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 2/20

6:35 am-11:05 pm

2 stops23h 30m

Boise Air Term. Gowen Fld

Mon 3/2

10:40 am-7:25 am

1 stop13h 45m

$728

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Fri 1/23

6:35 am-7:01 pm

2 stops20h 26m

Spokane

Sat 1/31

6:53 am-12:00 pm

1 stop21h 07m

$768

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Mon 12/15

12:15 pm-4:27 pm

2 stops35h 12m

Idaho Falls Fanning Field

Fri 1/9

9:00 am-10:50 am

2 stops18h 50m

$986

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Sat 11/22

6:20 am-10:33 pm

2 stops23h 13m

Idaho Falls Fanning Field

Tue 11/25

6:00 am-7:05 am

2 stops18h 05m

$1,002

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Sat 11/22

6:20 am-6:17 pm

2 stops18h 57m

Idaho Falls Fanning Field

Wed 11/26

6:00 am-7:05 am

2 stops18h 05m

$1,011

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/17

Showing 1-10 of 35 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 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.

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, Delta, and American Airlines can get you from London Heathrow Airport to Idaho in just under 22h 29m. Your travel time can differ by up to 2h 56m. 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 cheapest airlines to fly from London Heathrow Airport to Idaho one-way?

    $590 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on United Airlines and Lufthansa, with prices starting from $858 and $872, respectively.

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

    While some choose either London Heathrow - Jackson Hole or London Heathrow - Spokane, 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 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 Heathrow to Idaho

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