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$407+ 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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
Apr 24 — May 11
Fri 4/24
Fri 5/1
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 March 25, 2026.

This Trip.com deal was found by Cheapflights users on 3/22. 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.
Tue 4/148:45 am
LHR
-
BOI
2 stops21h 17m
Multiple Airlines
Wed 4/2210:45 am
BOI
-
LHR
1 stop16h 25m
Multiple Airlines
Deal found 3/22$804
This Cheapflightsfares deal was found by Cheapflights users on 3/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2010:50 am
LHR
-
BOI
2 stops19h 12m
Lufthansa
Mon 4/2712:04 pm
BOI
-
LHR
1 stop13h 26m
Lufthansa
Deal found 3/23$834
This Cheapflightsfares deal was found by Cheapflights users on 3/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/278:30 am
LHR
-
GEG
2 stops20h 41m
Lufthansa
Mon 5/412:25 pm
GEG
-
LHR
1 stop14h 45m
Lufthansa
Deal found 3/23$836
This United Airlines deal was found by Cheapflights users on 3/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/58:45 am
LHR
-
GEG
2 stops20h 55m
United Airlines
Tue 5/1212:25 pm
GEG
-
LHR
1 stop14h 45m
United Airlines
Deal found 3/21$852
This United Airlines deal was found by Cheapflights users on 3/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/58:45 am
LHR
-
BOI
2 stops19h 32m
United Airlines
Tue 5/126:30 am
BOI
-
LHR
1 stop22h 55m
United Airlines
Deal found 3/21$852
This United Airlines deal was found by Cheapflights users on 3/23. 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 4/2010:50 am
LHR
-
BOI
2 stops18h 45m
United Airlines
Mon 4/276:15 am
BOI
-
LHR
1 stop21h 55m
United Airlines
Deal found 3/23$854
This United Airlines deal was found by Cheapflights users on 3/24. 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 9/306:55 am
LHR
-
GEG
2 stops22h 14m
United Airlines
Sun 10/44:00 pm
GEG
-
LHR
1 stop33h 40m
United Airlines
Deal found 3/24$858
This United Airlines deal was found by Cheapflights users on 3/20. 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 4/277:25 am
LHR
-
GEG
2 stops22h 10m
United Airlines
Mon 5/412:25 pm
GEG
-
LHR
1 stop14h 45m
United Airlines
Deal found 3/20$863
This Cheapflightsfares deal was found by Cheapflights users on 3/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/279:15 am
LCY
-
GEG
2 stops20h 20m
Lufthansa
Mon 5/412:25 pm
GEG
-
LCY
2 stops21h 30m
Lufthansa
Deal found 3/20$864
This United Airlines deal was found by Cheapflights users on 3/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/194:25 pm
LHR
-
BOI
2 stops37h 10m
United Airlines
Sun 4/265:29 pm
BOI
-
LHR
1 stop33h 11m
United Airlines
Deal found 3/21$865
This Kiwi.com deal was found by Cheapflights users on 3/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/77:10 pm
LHR
-
GEG
2 stops34h 06m
Lufthansa
Thu 5/1412:25 pm
GEG
-
LHR
1 stop14h 45m
Lufthansa
Deal found 3/23$869
This United Airlines deal was found by Cheapflights users on 3/23. 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.
Thu 5/78:45 am
LHR
-
GEG
2 stops20h 55m
United Airlines
Thu 5/146:00 am
GEG
-
LHR
2 stops20h 10m
United Airlines
Deal found 3/23$890

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 March 25, 2026.

Round-trip from

$804
(Trip.com)

One-way from

$407
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$838
From London (LON) to Idaho
Search Deals
One-way flight from London (LON) to Idaho
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($98 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($55 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 25, 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

Tue 5/5

8:45 am-9:40 pm

2 stops20h 55m

Spokane

Tue 5/12

12:25 pm-11:10 am

1 stop14h 45m

$852

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

10:50 am-10:35 pm

2 stops18h 45m

Boise Air Term. Gowen Fld

Mon 4/27

7:11 am-9:40 am

2 stops19h 29m

$854

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 4/27

7:25 am-9:35 pm

2 stops22h 10m

Spokane

Mon 5/4

12:25 pm-11:10 am

1 stop14h 45m

$863

LondonSpokane

LCY - GEG

LCYGEG

London City

Mon 4/27

9:15 am-9:35 pm

2 stops20h 20m

Spokane

Mon 5/4

12:25 pm-5:55 pm

2 stops21h 30m

$864

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sun 4/19

4:25 pm-10:35 pm

2 stops37h 10m

Boise Air Term. Gowen Fld

Sun 4/26

5:29 pm-9:40 am

1 stop33h 11m

$865

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 9/9

11:25 am-9:04 pm

1 stop17h 39m

Spokane

Sun 9/13

12:57 pm-7:25 am

1 stop34h 28m

$889

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 5/7

8:45 am-9:40 pm

2 stops20h 55m

Spokane

Thu 5/14

6:00 am-10:10 am

2 stops20h 10m

$890
Quickest round-trip

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Thu 9/10

2:50 pm-10:32 pm

1 stop14h 42m

Boise Air Term. Gowen Fld

Mon 9/14

2:44 pm-9:40 am

1 stop11h 56m

$927

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Fri 5/8

8:40 am-10:50 pm

2 stops22h 10m

Spokane

Fri 5/15

4:10 pm-9:40 am

1 stop33h 30m

$932

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 8/26

10:50 am-10:25 pm

1 stop19h 35m

Spokane

Mon 8/31

6:05 am-10:55 am

1 stop20h 50m

$969

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/22

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, March is the cheapest month in which you can book a flight from London to Idaho (average of $685). Flying from London to Idaho in February is currently the most expensive (average of $914). 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 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 20h 41m. Lufthansa provides one of the quickest options available for as low as $836. 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 - Boise Air Term. Gowen Fld, London Gatwick - Boise Air Term. Gowen Fld or London Heathrow - Jackson Hole 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, March is the cheapest month in which you can book a flight from London to Idaho (average of $685). Flying from London to Idaho in February is currently the most expensive (average of $914). 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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