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$325+ Cheap flights from Idaho to London (LON)

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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
Mar 4 — Mar 111
Wed 3/4
Wed 3/11
1 adult, Economy
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Cheap flight deals from Idaho to London

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 2, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 1/31. 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 3/22:40 pm
BOI
-
LHR
2 stops19h 10m
Lufthansa
Mon 3/96:35 am
LHR
-
BOI
2 stops20h 54m
Lufthansa
Deal found 1/31$624
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/41:44 pm
GEG
-
LHR
2 stops20h 01m
Lufthansa
Wed 3/116:35 am
LHR
-
GEG
2 stops21h 43m
Lufthansa
Deal found 2/2$624
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:00 am
GEG
-
LGW
2 stops19h 00m
American Airlines
Mon 3/912:30 pm
LGW
-
GEG
2 stops30h 14m
American Airlines
Deal found 2/2$626
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:00 am
GEG
-
LHR
2 stops17h 30m
Multiple Airlines
Tue 3/107:40 am
LHR
-
GEG
2 stops20h 38m
Multiple Airlines
Deal found 2/2$634
This United Airlines deal was found by Cheapflights users on 1/31. 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 3/21:38 pm
JAC
-
LHR
1 stop16h 52m
United Airlines
Mon 3/97:40 am
LHR
-
JAC
2 stops19h 14m
United Airlines
Deal found 1/31$635
This United Airlines deal was found by Cheapflights users on 1/31. 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 3/26:55 pm
BOI
-
LHR
1 stop34h 05m
United Airlines
Mon 3/97:40 am
LHR
-
BOI
2 stops19h 49m
United Airlines
Deal found 1/31$635
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.
Wed 3/412:38 pm
GEG
-
LHR
1 stop15h 22m
United Airlines
Wed 3/116:35 am
LHR
-
GEG
2 stops21h 28m
United Airlines
Deal found 2/2$635
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.
Thu 3/55:00 am
GEG
-
LHR
2 stops18h 10m
United Airlines
Sat 3/146:35 am
LHR
-
GEG
2 stops21h 28m
United Airlines
Deal found 2/2$638
This United Airlines deal was found by Cheapflights users on 2/1. 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 3/185:00 am
GEG
-
LHR
2 stops17h 55m
United Airlines
Wed 3/256:35 am
LHR
-
GEG
2 stops21h 28m
United Airlines
Deal found 2/1$639
This Delta deal was found by Cheapflights users on 2/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/45:50 am
BOI
-
LHR
2 stops19h 15m
Delta
Wed 3/118:40 am
LHR
-
BOI
2 stops18h 29m
Delta
Deal found 2/1$640
This United Airlines deal was found by Cheapflights users on 1/31. 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 3/171:37 pm
GEG
-
LHR
1 stop13h 03m
United Airlines
Tue 3/2411:10 am
LHR
-
GEG
2 stops40h 53m
United Airlines
Deal found 1/31$646
This United Airlines deal was found by Cheapflights users on 2/1. 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 4/710:40 am
IDA
-
LHR
1 stop18h 40m
United Airlines
Tue 4/147:25 am
LHR
-
IDA
2 stops33h 28m
United Airlines
Deal found 2/1$651

Find flight deals from Idaho to London

Keep the following information in mind while searching for Idaho to London flight deals. Data was last updated February 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$624
(Cheapflightsfares)

One-way from

$325
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$819
Provider with most accurate pricing for Boise Air Term. Gowen Fld-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-London (LON) flights.
Search Deals
From Idaho to London (LON)
Search Deals
One-way flight from Idaho to London (LON)
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($265 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($45 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 Idaho to London 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 2, 2026.
Use the filters below to find and compare flights from Idaho to London that are best for you.

Fly from

Idaho

Fly to

London

Route

Depart

Return

Price

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

7:00 am-3:50 pm

2 stops24h 50m

London Heathrow

Mon 3/9

6:35 am-9:18 pm

2 stops21h 43m

$624

SpokaneLondon

GEG - LGW

GEGLGW

Spokane

Wed 3/4

6:00 am-9:00 am

2 stops19h 00m

London Gatwick

Mon 3/9

12:30 pm-11:44 am

2 stops30h 14m

$626

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Mon 3/2

1:38 pm-1:30 pm

1 stop16h 52m

London Heathrow

Mon 3/9

7:40 am-8:54 pm

2 stops19h 14m

$635

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Thu 3/5

12:42 pm-7:25 am

1 stop34h 43m

London Heathrow

Sat 3/14

6:35 am-9:03 pm

2 stops21h 28m

$635

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Thu 3/5

6:00 am-5:55 am

1 stop15h 55m

London Heathrow

Tue 3/10

6:35 am-9:18 pm

2 stops45h 43m

$635

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 3/3

7:00 am-5:55 am

1 stop14h 55m

London Heathrow

Tue 3/10

6:35 am-9:03 pm

2 stops21h 28m

$635

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

12:38 pm-12:00 pm

1 stop15h 22m

London Heathrow

Wed 3/11

6:35 am-9:03 pm

2 stops21h 28m

$635

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

5:00 am-9:40 am

1 stop20h 40m

London Heathrow

Mon 3/9

7:40 am-9:03 pm

2 stops20h 23m

$635

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/18

12:41 pm-12:00 pm

1 stop16h 19m

London Heathrow

Wed 3/25

6:35 am-9:03 pm

2 stops21h 28m

$635

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 4/13

2:30 pm-12:20 pm

1 stop14h 50m

London Heathrow

Tue 4/21

6:55 am-9:53 am

2 stops33h 58m

$651

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/31

Showing 1-10 of 60 results
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Best time to book a flight from Idaho to London

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

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

Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of $622). Flying from Idaho to London in June is currently the most expensive (average of $1,085). 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 Idaho to London. 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 Idaho to London?

    A quick flight from Idaho to London can take about 16h 52m. Lufthansa provides one of the quickest options available for as low as $635. Idaho and London are separated by a distance of 4658 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the most popular routes from Idaho to London?

    The most popular flight routes from Idaho to London are Boise Air Term. Gowen Fld - London Heathrow, Spokane - London Heathrow and Spokane - London Gatwick.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho to London 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 Idaho to London?

    Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of $622). Flying from Idaho to London in June is currently the most expensive (average of $1,085). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Ilford
Hounslow
Croydon
Southend-on-Sea
Harrow
Eastleigh
Gatwick
Dartford
Dover
Winchester
Orpington
Watford
Hayes
Borehamwood
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Eastbourne
Sutton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Idaho to London

Discover the top 5 airlines that operate flights from Idaho to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$577Average$774FlexibilityNo cancel feeOn-time75%
Virgin AtlanticCheapest$604Average$931FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$639Average$862FlexibilityNo cancel feeOn-time69%
DeltaCheapest$701Average$1,006FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$703Average$874FlexibilityNo cancel feeOn-time71%

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