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Idaho

$575+ 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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
Mar 10 — Mar 171
Tue 3/10
Tue 3/17
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 February 8, 2026.

This United Airlines deal was found by Cheapflights users on 2/6. 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 3/106:35 am
LHR
-
GEG
2 stops21h 28m
United Airlines
Tue 3/176:00 am
GEG
-
LHR
2 stops21h 50m
United Airlines
Deal found 2/6$756
This Trip.com deal was found by Cheapflights users on 2/6. 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.
Wed 3/1812:15 pm
LHR
-
BOI
2 stops16h 42m
Multiple Airlines
Wed 4/16:00 am
BOI
-
LHR
2 stops22h 55m
Multiple Airlines
Deal found 2/6$765
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/146:50 am
LHR
-
BOI
2 stops23h 07m
United Airlines
Tue 5/55:27 pm
BOI
-
LHR
1 stop11h 53m
United Airlines
Deal found 2/8$778
This United Airlines deal was found by Cheapflights users on 2/6. 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 5/48:40 am
LHR
-
GEG
2 stops21h 00m
United Airlines
Sun 5/1012:35 pm
GEG
-
LHR
1 stop34h 50m
United Airlines
Deal found 2/6$779
This United Airlines deal was found by Cheapflights users on 2/5. 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 9/16:55 am
LHR
-
BOI
2 stops21h 21m
United Airlines
Wed 9/95:22 pm
BOI
-
LHR
1 stop33h 18m
United Airlines
Deal found 2/5$779
This Globehunters deal was found by Cheapflights users on 2/8. 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 Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/142:50 pm
LHR
-
BOI
1 stop13h 32m
Lufthansa
Tue 5/58:34 am
BOI
-
LHR
1 stop15h 11m
Lufthansa
Deal found 2/8$790
This United Airlines deal was found by Cheapflights users on 2/7. 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.
Sun 3/84:40 pm
LHR
-
GEG
2 stops51h 01m
United Airlines
Sun 3/1512:42 pm
GEG
-
LHR
1 stop35h 43m
United Airlines
Deal found 2/7$791
This ChecknFly deal was found by Cheapflights users on 2/7. 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.
Mon 4/202:50 pm
LHR
-
BOI
1 stop26h 04m
Lufthansa
Mon 4/279:26 am
BOI
-
LHR
1 stop18h 44m
Lufthansa
Deal found 2/7$796
This Trip.com deal was found by Cheapflights users on 2/5. 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 10/267:40 am
LHR
-
BOI
2 stops21h 15m
Multiple Airlines
Sun 11/88:18 am
BOI
-
LHR
2 stops26h 32m
Multiple Airlines
Deal found 2/5$797
This United Airlines deal was found by Cheapflights users on 2/5. 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 9/14:15 pm
LHR
-
BOI
1 stop14h 44m
United Airlines
Tue 9/152:43 pm
BOI
-
LHR
1 stop11h 57m
United Airlines
Deal found 2/5$812
This United Airlines deal was found by Cheapflights users on 2/5. 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 9/26:55 am
LHR
-
BOI
2 stops21h 21m
United Airlines
Fri 9/115:22 pm
BOI
-
LHR
1 stop11h 58m
United Airlines
Deal found 2/5$820
This United Airlines deal was found by Cheapflights users on 2/5. 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 9/49:30 am
LHR
-
BOI
2 stops19h 52m
United Airlines
Thu 9/108:20 am
BOI
-
LHR
1 stop16h 05m
United Airlines
Deal found 2/5$821

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 February 8, 2026.

Round-trip from

$756
(United Airlines)

One-way from

$575
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$804
From London Heathrow to Idaho
Search Deals
One-way flight from London Heathrow to Idaho
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($95 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($54 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 8, 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

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-10:50 am

2 stops21h 50m

$756

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 4/14

6:50 am-10:57 pm

2 stops23h 07m

Boise Air Term. Gowen Fld

Tue 5/5

5:27 pm-12:20 pm

1 stop11h 53m

$778

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 5/4

8:40 am-9:40 pm

2 stops21h 00m

Spokane

Sun 5/10

12:35 pm-7:25 am

1 stop34h 50m

$779

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

8:00 am-9:15 pm

2 stops20h 15m

Boise Air Term. Gowen Fld

Mon 4/27

7:03 pm-6:45 am

2 stops28h 42m

$796

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

1:00 pm-9:15 pm

1 stop15h 15m

Boise Air Term. Gowen Fld

Mon 4/27

4:05 pm-2:10 pm

1 stop15h 05m

$812

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 3/18

9:30 am-9:13 pm

2 stops17h 43m

Boise Air Term. Gowen Fld

Wed 4/1

2:37 pm-9:40 am

1 stop12h 03m

$838

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Mon 3/9

8:25 pm-10:16 pm

2 stops31h 51m

Idaho Falls Fanning Field

Mon 3/16

1:10 pm-10:00 am

1 stop14h 50m

$983

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Mon 3/9

4:10 pm-1:48 pm

1 stop27h 38m

Idaho Falls Fanning Field

Mon 3/16

2:18 pm-11:40 am

1 stop15h 22m

$1,027

LondonHailey

LHR - SUN

LHRSUN

London Heathrow

Mon 3/23

8:00 pm-9:50 pm

2 stops31h 50m

Hailey Sun Valley-Friedman

Mon 3/30

3:30 pm-3:35 pm

2 stops17h 05m

$1,041

LondonHailey

LHR - SUN

LHRSUN

London Heathrow

Sat 3/7

10:45 am-9:53 pm

2 stops18h 08m

Hailey Sun Valley-Friedman

Sat 3/14

6:59 pm-6:20 am

2 stops29h 21m

$1,085

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

Showing 1-10 of 26 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 $683). 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.

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 Virgin Atlantic can get you from London Heathrow Airport to Idaho in just under 20h 15m. Your travel time can differ by up to 11h 36m. 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 most popular routes from London Heathrow Airport to Idaho?

    While some choose either London Heathrow - Spokane or London Heathrow - Idaho Falls Fanning Field, 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 $683). 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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