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$297+ 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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Cheap flight deals from Idaho to London

Keep the following information in mind while searching for Idaho to London flight deals. Data was last updated November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$566
(Netflights)

One-way from

$297
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$949
Provider with most accurate pricing for Boise Air Term. Gowen Fld-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-London (LON) flights.
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From Idaho to London (LON)
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One-way flight from Idaho to London (LON)
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Highest demand for flights based on searches. 23% potential increase in price ($279 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($48 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find 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 November 3, 2025.

This KLM deal was found by Cheapflights users on 11/3. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/512:51 pmGEG - LHR
1 stop14h 49mMultiple Airlines
Wed 11/196:20 amLHR - GEG
2 stops17h 28mMultiple Airlines
Deal found 11/3$590
This Delta deal was found by Cheapflights users on 11/1. 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 11/191:50 pmBOI - LHR
1 stop13h 40mDelta
Wed 11/266:30 amLHR - BOI
2 stops16h 35mDelta
Deal found 11/1$591
This Delta deal was found by Cheapflights users on 11/1. 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 11/121:15 pmGEG - LHR
1 stop12h 45mDelta
Wed 12/36:30 amLHR - GEG
2 stops21h 40mDelta
Deal found 11/1$592
This Delta deal was found by Cheapflights users on 11/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/56:10 amGEG - LHR
2 stops16h 55mDelta
Wed 11/196:20 amLHR - GEG
2 stops20h 13mDelta
Deal found 11/3$594
This KLM deal was found by Cheapflights users on 11/3. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/121:16 pmGEG - LHR
1 stop14h 24mKLM
Wed 12/312:20 pmLHR - GEG
1 stop14h 36mKLM
Deal found 11/3$597
This Virgin Atlantic deal was found by Cheapflights users on 11/1. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/105:35 amBOI - LHR
2 stops17h 45mVirgin Atlantic
Wed 12/179:40 amLHR - BOI
2 stops21h 29mVirgin Atlantic
Deal found 11/1$602
This KLM deal was found by Cheapflights users on 11/2. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/711:44 amBOI - LHR
1 stop15h 46mKLM
Sun 12/1411:20 amLHR - BOI
1 stop17h 45mKLM
Deal found 11/2$622
This KLM deal was found by Cheapflights users on 11/2. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/71:12 pmGEG - LHR
1 stop14h 28mKLM
Sun 12/1410:45 amLHR - GEG
1 stop15h 52mKLM
Deal found 11/2$622
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/79:00 amBOI - LHR
2 stops18h 15mDelta
Sun 12/141:00 pmLHR - BOI
2 stops18h 09mDelta
Deal found 11/2$627
This KLM deal was found by Cheapflights users on 11/2. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/76:00 amGEG - LHR
2 stops16h 50mMultiple Airlines
Sun 12/1410:45 amLHR - GEG
1 stop15h 52mMultiple Airlines
Deal found 11/2$627
This KLM deal was found by Cheapflights users on 11/1. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/71:00 pmJAC - LHR
1 stop14h 00mMultiple Airlines
Fri 11/146:20 amLHR - JAC
2 stops17h 50mMultiple Airlines
Deal found 11/1$640
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/139:00 amBOI - LHR
1 stop20h 50mDelta
Wed 11/198:55 amLHR - BOI
2 stops20h 44mDelta
Deal found 11/2$640

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 November 3, 2025.
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

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

1:46 pm-12:50 pm

1 stop16h 04m

London Heathrow

Thu 2/26

11:05 am-8:57 pm

1 stop16h 52m

$566

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

1:00 pm-10:00 am

1 stop14h 00m

London Heathrow

Thu 2/26

6:20 am-4:05 pm

2 stops16h 45m

$588

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 12/31

11:21 am-10:30 am

1 stop15h 09m

London Heathrow

Wed 1/14

6:20 am-6:47 pm

2 stops20h 27m

$590

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

1:46 pm-12:50 pm

1 stop16h 04m

London Heathrow

Tue 2/24

6:20 am-6:28 pm

2 stops19h 08m

$598

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

7:15 am-10:55 am

1 stop20h 40m

London Heathrow

Fri 2/27

6:20 am-9:58 pm

2 stops22h 38m

$598

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 2/24

9:55 am-10:00 am

1 stop16h 05m

London Heathrow

Fri 3/6

8:55 am-9:20 pm

2 stops20h 25m

$598

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 2/24

12:47 pm-11:40 am

1 stop14h 53m

London Heathrow

Tue 3/10

6:20 am-4:10 pm

2 stops16h 50m

$598

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 12/10

5:35 am-6:20 am

2 stops17h 45m

London Heathrow

Wed 12/17

9:40 am-12:09 am

2 stops21h 29m

$602

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 2/25

9:55 am-8:45 am

2 stops14h 50m

London Heathrow

Fri 3/6

6:30 am-2:57 pm

2 stops16h 27m

$604

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

11:19 am-10:00 am

1 stop15h 41m

London Heathrow

Tue 2/24

11:05 am-8:57 pm

1 stop16h 52m

$605

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 41 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, July is the cheapest month in which you can book a flight from Idaho to London (average of $611). 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.

What is the cheapest time of day to fly from ID to LON?

Find hourly flight availability from Idaho to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 3, 2025.

When flying from Idaho to London, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 22% versus a flight in the afternoon.

What is the cheapest day to fly from Idaho to London?

Use this chart to determine the cheapest time to fly round-trip from Idaho to London. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Idaho to London flight should consider departing on Sunday mornings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 15h 09m. Virgin Atlantic provides one of the quickest options available for as low as $590. Idaho and London are separated by a distance of 4643 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Idaho to London one-way?

    The cheapest airlines for a one-way flight from Idaho to London are United Airlines ($393), Air Canada ($394), and Lufthansa ($397).

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

    The most popular flight routes from Idaho to London are Spokane - London Heathrow, Boise Air Term. Gowen Fld - 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, July is the cheapest month in which you can book a flight from Idaho to London (average of $611). 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
Hounslow
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Gatwick
Borehamwood
Aylesbury
Bedford
Chipping Norton
Wembley
Folkestone
Eastbourne
Sutton

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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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$577Average$774FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$639Average$968FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$695Average$881FlexibilityNo cancel feeOn-time72%
DeltaCheapest$701Average$1,035FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$703Average$873FlexibilityNo cancel feeOn-time71%

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