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Idaho

$395+ Cheap flights from London (LON) 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
Jul 23 — Jul 301
Thu 7/23
Thu 7/30
1 adult, Economy
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Cheap flight deals from London to Idaho

Cheapest flights from London to Idaho
Explore the most affordable flight options available from London to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 23, 2026.

This deal was found by Cheapflights users on 6/21. 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.
Wed 9/1611:25 am
LHR
-
GEG
1 stop17h 49m
United Airlines
Mon 9/2111:11 am
GEG
-
LHR
1 stop13h 19m
United Airlines
Deal found 6/21$685
This United Airlines deal was found by Cheapflights users on 6/19. 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 9/282:50 pm
LHR
-
BOI
2 stops29h 08m
United Airlines
Sun 10/42:51 pm
BOI
-
LHR
2 stops32h 54m
United Airlines
Deal found 6/19$828
This United Airlines deal was found by Cheapflights users on 6/19. 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 11/127:40 am
LHR
-
BOI
2 stops23h 06m
United Airlines
Mon 11/1611:51 am
BOI
-
LHR
1 stop16h 24m
United Airlines
Deal found 6/19$866
This United Airlines deal was found by Cheapflights users on 6/23. 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 12/73:20 pm
LHR
-
GEG
2 stops28h 04m
United Airlines
Sat 1/167:02 am
GEG
-
LHR
1 stop16h 23m
United Airlines
Deal found 6/23$867
This United Airlines deal was found by Cheapflights users on 6/23. 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 9/112:10 pm
LHR
-
BOI
2 stops32h 21m
United Airlines
Sun 9/276:50 pm
BOI
-
LHR
1 stop29h 35m
United Airlines
Deal found 6/23$867
This United Airlines deal was found by Cheapflights users on 6/19. 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 11/57:40 am
LHR
-
BOI
2 stops23h 06m
United Airlines
Tue 11/1712:32 pm
BOI
-
LHR
1 stop16h 28m
United Airlines
Deal found 6/19$868
This United Airlines deal was found by Cheapflights users on 6/19. 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 11/61:00 pm
LHR
-
BOI
2 stops34h 59m
United Airlines
Thu 11/1912:32 pm
BOI
-
LHR
1 stop16h 28m
United Airlines
Deal found 6/19$871
This Air Canada deal was found by Cheapflights users on 6/19. 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.
Thu 11/122:30 pm
LHR
-
BOI
2 stops27h 44m
Air Canada
Mon 11/165:44 pm
BOI
-
LHR
2 stops29h 46m
Air Canada
Deal found 6/19$874
This Expedia deal was found by Cheapflights users on 6/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/311:35 am
LHR
-
BOI
1 stop13h 20m
Lufthansa
Sun 11/1512:29 pm
BOI
-
LHR
1 stop34h 26m
Lufthansa
Deal found 6/19$877
This Expedia deal was found by Cheapflights users on 6/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/162:50 pm
LHR
-
GEG
1 stop14h 24m
Lufthansa
Mon 9/211:09 pm
GEG
-
LHR
1 stop14h 01m
Lufthansa
Deal found 6/19$888
This United Airlines deal was found by Cheapflights users on 6/19. 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 11/13:20 pm
LHR
-
BOI
2 stops32h 39m
United Airlines
Fri 11/1311:51 am
BOI
-
LHR
1 stop16h 24m
United Airlines
Deal found 6/19$907
This Air Canada deal was found by Cheapflights users on 6/23. 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.
Fri 9/119:30 am
LHR
-
BOI
2 stops37h 01m
Air Canada
Sat 9/265:00 am
BOI
-
LHR
2 stops22h 00m
Air Canada
Deal found 6/23$913

Find flight deals from London to Idaho

Keep the following information in mind while searching for London to Idaho flight deals. Data was last updated June 23, 2026.

Round-trip from

$685

One-way from

$395
(Virgin Atlantic)

Popular in

December

Cheapest in

January

Average price

$1,087
From London (LON) to Idaho
Search Deals
One-way flight from London (LON) to Idaho
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($77 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($49 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London 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 June 23, 2026.
Use the filters below to find and compare flights from London to Idaho that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 9/16

2:50 pm-9:14 pm

1 stop14h 24m

Spokane

Mon 9/21

11:11 am-11:55 am

1 stop16h 44m

$685

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 11/3

11:35 am-11:14 am

2 stops30h 39m

Boise Air Term. Gowen Fld

Sun 11/15

6:59 pm-9:40 am

2 stops31h 41m

$828

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 12/7

3:20 pm-11:24 am

2 stops28h 04m

Spokane

Sat 1/16

11:30 am-10:50 am

2 stops15h 20m

$867

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Thu 11/5

7:40 am-11:46 pm

2 stops23h 06m

Boise Air Term. Gowen Fld

Wed 11/18

2:39 pm-9:40 am

1 stop12h 01m

$868

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 11/3

7:40 am-11:46 pm

2 stops23h 06m

Boise Air Term. Gowen Fld

Fri 11/13

12:32 pm-12:00 pm

1 stop16h 28m

$868

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 11/6

1:00 pm-4:59 pm

2 stops34h 59m

Boise Air Term. Gowen Fld

Thu 11/19

12:32 pm-12:00 pm

1 stop16h 28m

$871

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Thu 11/12

6:35 am-9:19 pm

2 stops21h 44m

Boise Air Term. Gowen Fld

Mon 11/16

8:22 am-11:15 am

1 stop19h 53m

$915

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 11/6

9:30 am-9:19 pm

2 stops18h 49m

Boise Air Term. Gowen Fld

Tue 11/17

5:00 am-5:55 am

2 stops17h 55m

$916

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Thu 11/12

2:45 pm-3:17 pm

1 stop31h 32m

Idaho Falls Fanning Field

Mon 11/16

6:04 am-12:20 pm

1 stop23h 16m

$1,050

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Tue 11/3

10:00 am-11:08 pm

2 stops20h 08m

Boise Air Term. Gowen Fld

Fri 11/13

7:15 am-3:45 pm

2 stops25h 30m

$1,088

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/23

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from London to Idaho

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

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

Currently, January is the cheapest month in which you can book a flight from London to Idaho (average of $673). Flying from London to Idaho in July is currently the most expensive (average of $884). 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 to Idaho?

Related info for your journey

Find useful and relevant information for your journey from London 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 to Idaho?

    A quick flight from London to Idaho can take about 14h 24m. United Airlines provides one of the quickest options available for as low as $685. Airlines will cover 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 to Idaho?

    When deciding which route to take from London to Idaho consider London Heathrow - Spokane, London Heathrow - Boise Air Term. Gowen Fld or London Gatwick - Spokane as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London 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 to Idaho?

    Currently, January is the cheapest month in which you can book a flight from London to Idaho (average of $673). Flying from London to Idaho in July is currently the most expensive (average of $884). 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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