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$500+ 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 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
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 February 4, 2026.

This Trip.com deal was found by Cheapflights users on 2/2. 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 3/116:30 am
LHR
-
BOI
2 stops20h 45m
Multiple Airlines
Fri 3/202:22 pm
BOI
-
LHR
2 stops34h 28m
Multiple Airlines
Deal found 2/2$711
This United Airlines deal was found by Cheapflights users on 2/3. 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 43m
United Airlines
Tue 3/176:00 am
GEG
-
LHR
2 stops21h 25m
United Airlines
Deal found 2/3$761
This United Airlines deal was found by Cheapflights users on 2/3. 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 9/18:45 am
LHR
-
BOI
2 stops19h 30m
United Airlines
Thu 9/108:20 am
BOI
-
LHR
1 stop16h 05m
United Airlines
Deal found 2/3$773
This United Airlines deal was found by Cheapflights users on 2/2. 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 4/206:55 am
LHR
-
BOI
2 stops22h 40m
United Airlines
Mon 4/276:15 am
BOI
-
LHR
1 stop20h 25m
United Airlines
Deal found 2/2$778
This United Airlines deal was found by Cheapflights users on 2/2. 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 2/2$785
This ChecknFly deal was found by Cheapflights users on 2/2. 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 4/2011:25 am
LHR
-
BOI
1 stop29h 29m
Lufthansa
Mon 4/277:11 am
BOI
-
LHR
1 stop19h 59m
Lufthansa
Deal found 2/2$802
This The Travel House deal was found by Cheapflights users on 2/2. 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 3/1011:55 am
LGW
-
GEG
2 stops16h 42m
Icelandair
Tue 3/1712:00 pm
GEG
-
LGW
2 stops15h 55m
Icelandair
Deal found 2/2$807
This ChecknFly deal was found by Cheapflights users on 2/2. 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.
Wed 3/1111:35 am
LHR
-
BOI
1 stop17h 08m
Lufthansa
Fri 3/206:55 pm
BOI
-
LHR
1 stop30h 30m
Lufthansa
Deal found 2/2$825
This The Travel House deal was found by Cheapflights users on 2/3. 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 5/256:40 pm
LHR
-
BOI
2 stops32h 35m
Scandinavian Airlines
Fri 5/2912:16 pm
BOI
-
LHR
2 stops38h 04m
Scandinavian Airlines
Deal found 2/3$843
This United Airlines deal was found by Cheapflights users on 2/3. 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 3/186:50 am
LHR
-
BOI
2 stops22h 06m
United Airlines
Wed 4/12:37 pm
BOI
-
LHR
1 stop12h 03m
United Airlines
Deal found 2/3$855
This Cheapflightsfares deal was found by Cheapflights users on 2/3. 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.
Wed 3/1811:35 am
LHR
-
BOI
1 stop15h 54m
Lufthansa
Wed 4/110:35 am
BOI
-
LHR
1 stop16h 05m
Lufthansa
Deal found 2/3$857
This Expedia deal was found by Cheapflights users on 2/2. 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.
Sat 9/126:55 am
LHR
-
BOI
2 stops21h 21m
Lufthansa
Sat 9/262:43 pm
BOI
-
LHR
1 stop14h 37m
Lufthansa
Deal found 2/2$861

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 February 4, 2026.

Round-trip from

$711
(Trip.com)

One-way from

$500

Popular in

December

Cheapest in

January

Average price

$804
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 ($83 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 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 February 4, 2026.
Use the filters below to find and compare flights from London to Idaho that are best for you.

Fly from

London

Fly to

Idaho

Route

Depart

Return

Price

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 3/11

6:30 am-9:15 pm

2 stops20h 45m

Boise Air Term. Gowen Fld

Fri 3/20

2:22 pm-6:50 am

2 stops34h 28m

$711

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/10

6:35 am-9:18 pm

2 stops21h 43m

Spokane

Tue 3/17

6:00 am-10:25 am

2 stops21h 25m

$761

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

6:55 am-10:35 pm

2 stops22h 40m

Boise Air Term. Gowen Fld

Mon 4/27

6:15 am-9:40 am

1 stop20h 25m

$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

$785

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 4/20

11:25 am-9:54 am

1 stop29h 29m

Boise Air Term. Gowen Fld

Mon 4/27

7:11 am-10:10 am

1 stop19h 59m

$802

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sun 3/15

11:05 am-12:13 pm

2 stops55h 08m

Boise Air Term. Gowen Fld

Sun 3/22

5:31 pm-9:40 am

1 stop34h 09m

$802

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Tue 3/10

11:55 am-9:37 pm

2 stops16h 42m

Spokane

Tue 3/17

12:00 pm-10:55 am

2 stops15h 55m

$807

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 3/11

11:35 am-10:43 pm

1 stop17h 08m

Boise Air Term. Gowen Fld

Fri 3/20

6:55 pm-7:25 am

1 stop30h 30m

$825

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 3/18

6:50 am-10:56 pm

2 stops22h 06m

Boise Air Term. Gowen Fld

Wed 4/1

2:37 pm-9:40 am

1 stop12h 03m

$855

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sat 3/7

6:35 am-9:06 am

2 stops33h 31m

Boise Air Term. Gowen Fld

Sat 3/14

6:55 pm-12:00 pm

1 stop35h 05m

$872

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Showing 1-10 of 60 results
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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 $689). Flying from London 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 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 16h 42m. United Airlines provides one of the quickest options available for as low as $807. Airlines will cover a distance of 4667 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 $689). Flying from London 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 London to Idaho

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