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$450+ 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 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
Feb 17 — Feb 241
Tue 2/17
Tue 2/24
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 January 18, 2026.

Round-trip from

$580
(Trip.com)

One-way from

$450
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$776
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. 8% potential increase in price ($93 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($54 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 18, 2026.

This Trip.com deal was found by Cheapflights users on 1/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/168:35 pm
LHR
-
BOI
2 stops32h 05m
Multiple Airlines
Mon 3/306:00 am
BOI
-
LHR
2 stops22h 55m
Multiple Airlines
Deal found 1/16$580
This The Travel House deal was found by Cheapflights users on 1/17. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/108:20 am
LHR
-
GEG
2 stops21h 54m
Finnair
Tue 3/176:00 am
GEG
-
LHR
2 stops17h 15m
Finnair
Deal found 1/17$658
This The Travel House deal was found by Cheapflights users on 1/16. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/104:15 pm
LHR
-
GEG
2 stops35h 57m
Iberia
Tue 3/1712:25 pm
GEG
-
LHR
1 stop15h 00m
Iberia
Deal found 1/16$666
This Kiwi.com deal was found by Cheapflights users on 1/16. 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.
Mon 3/26:30 am
LHR
-
GEG
2 stops18h 33m
Multiple Airlines
Mon 3/97:06 pm
GEG
-
LHR
1 stop13h 39m
Multiple Airlines
Deal found 1/16$698
This United Airlines deal was found by Cheapflights users on 1/16. 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 3/29:00 am
LHR
-
GEG
2 stops20h 07m
United Airlines
Mon 3/91:37 pm
GEG
-
LHR
1 stop13h 03m
United Airlines
Deal found 1/16$699
This United Airlines deal was found by Cheapflights users on 1/17. 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 2/56:35 am
LHR
-
GEG
2 stops20h 41m
United Airlines
Sun 2/85:00 am
GEG
-
LHR
2 stops17h 20m
United Airlines
Deal found 1/17$703
This Lufthansa deal was found by Cheapflights users on 1/17. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/39:30 am
LHR
-
GEG
2 stops19h 47m
Lufthansa
Tue 3/1012:42 pm
GEG
-
LHR
2 stops17h 48m
Lufthansa
Deal found 1/17$705
This Lufthansa deal was found by Cheapflights users on 1/16. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/28:30 am
LHR
-
GEG
2 stops20h 37m
Lufthansa
Mon 3/91:37 pm
GEG
-
LHR
2 stops20h 28m
Lufthansa
Deal found 1/16$710
This The Travel House deal was found by Cheapflights users on 1/17. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/410:05 am
LHR
-
GEG
1 stop18h 23m
Finnair
Sun 5/103:15 pm
GEG
-
LHR
2 stops32h 25m
Finnair
Deal found 1/17$718
This United Airlines deal was found by Cheapflights users on 1/16. 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 5/47:25 am
LHR
-
GEG
2 stops35h 51m
United Airlines
Sun 5/1012:35 pm
GEG
-
LHR
2 stops37h 35m
United Airlines
Deal found 1/16$720
This United Airlines deal was found by Cheapflights users on 1/16. 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 3/169:00 am
LHR
-
BOI
2 stops20h 57m
United Airlines
Mon 3/302:37 pm
BOI
-
LHR
1 stop14h 43m
United Airlines
Deal found 1/16$743
This United Airlines deal was found by Cheapflights users on 1/18. 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 3/48:30 am
LHR
-
BOI
2 stops20h 02m
United Airlines
Wed 3/116:24 am
BOI
-
LHR
1 stop23h 36m
United Airlines
Deal found 1/18$749

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 January 18, 2026.
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

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 3/16

8:35 pm-10:40 pm

2 stops32h 05m

Boise Air Term. Gowen Fld

Mon 3/30

6:00 am-11:55 am

2 stops22h 55m

$580

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

8:20 am-11:14 pm

2 stops21h 54m

Spokane

Tue 3/17

6:00 am-6:15 am

2 stops17h 15m

$658

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

4:15 pm-9:12 pm

2 stops35h 57m

Spokane

Tue 3/17

12:25 pm-10:25 am

1 stop15h 00m

$666

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 3/2

6:30 am-5:03 pm

2 stops18h 33m

Spokane

Mon 3/9

7:06 pm-3:45 pm

1 stop13h 39m

$698

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 3/2

9:00 am-9:07 pm

2 stops20h 07m

Spokane

Mon 3/9

1:37 pm-9:40 am

1 stop13h 03m

$699

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 2/5

6:35 am-7:16 pm

2 stops20h 41m

Spokane

Sun 2/8

12:24 pm-12:00 pm

1 stop15h 36m

$703

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

6:35 am-9:18 pm

2 stops21h 43m

Spokane

Tue 3/17

1:37 pm-9:40 am

1 stop13h 03m

$703

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 3/4

8:30 am-9:32 pm

2 stops20h 02m

Boise Air Term. Gowen Fld

Wed 3/11

7:47 am-6:40 am

2 stops16h 53m

$749

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

5:00 am-6:55 am

2 stops18h 55m

$763

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 2/27

6:30 am-8:55 pm

2 stops21h 25m

Boise Air Term. Gowen Fld

Mon 3/9

6:15 am-9:40 am

1 stop21h 25m

$777

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/18

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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of $682). Flying from London Heathrow Airport 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 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?

    Finnair, Iberia, and United Airlines can get you from London Heathrow Airport to Idaho in just under 20h 07m. Your travel time can differ by up to 15h 50m. 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 - Jackson Hole, 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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of $682). Flying from London Heathrow Airport 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

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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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