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$242+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
ago. 4 — ago. 111
lun. 8/4
lun. 8/11
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 julio 30, 2025.

Round-trip from

$609
(KLM)

One-way from

$242
(Norse)

Popular in

June

Cheapest in

October

Average price

$1,232
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. 24% potential increase in price ($291 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 July 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 julio 30, 2025.

This KLM deal was found by Cheapflights users on 7/30. 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.
dom. 8/242:21 pmGEG - LHR
1 stop14h 49mKLM
mar. 9/96:30 amLHR - GEG
2 stops16h 15mKLM
Deal found 7/30$609
This United Airlines deal was found by Cheapflights users on 7/30. 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.
mar. 9/22:42 pmBOI - LHR
1 stop14h 38mUnited Airlines
jue. 9/115:40 pmLHR - BOI
2 stops26h 55mUnited Airlines
Deal found 7/30$613
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
mié. 9/178:00 amBOI - LGW
2 stops19h 55mMultiple Airlines
lun. 9/229:50 amLGW - BOI
1 stop20h 04mMultiple Airlines
Deal found 7/30$621
This Air France deal was found by Cheapflights users on 7/27. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/32:22 pmGEG - LHR
1 stop14h 48mMultiple Airlines
mar. 8/1910:55 amLHR - GEG
1 stop13h 18mMultiple Airlines
Deal found 7/27$621
This Delta deal was found by Cheapflights users on 7/29. 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.
dom. 9/145:45 amBOI - LHR
1 stop22h 35mDelta
mié. 10/86:15 amLHR - BOI
2 stops16h 51mDelta
Deal found 7/29$622
This Delta deal was found by Cheapflights users on 7/29. 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.
mié. 10/19:15 amGEG - LHR
1 stop18h 05mDelta
mar. 10/76:15 amLHR - GEG
2 stops18h 29mDelta
Deal found 7/29$622
This Booking.com deal was found by Cheapflights users on 7/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/239:52 amBOI - LHR
2 stops16h 43mAir Canada
mié. 10/18:30 amLHR - BOI
2 stops21h 00mAir Canada
Deal found 7/29$627
This United Airlines deal was found by Cheapflights users on 7/30. 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.
lun. 9/15:15 amGEG - LHR
1 stop20h 25mUnited Airlines
vie. 9/122:05 pmLHR - GEG
2 stops29h 22mUnited Airlines
Deal found 7/30$627
This KLM deal was found by Cheapflights users on 7/29. 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.
dom. 9/143:20 pmBOI - LHR
1 stop14h 50mKLM
mié. 10/811:00 amLHR - BOI
1 stop17h 51mKLM
Deal found 7/29$629
This Virgin Atlantic deal was found by Cheapflights users on 7/30. 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.
mar. 9/231:06 pmIDA - LHR
2 stops18h 09mVirgin Atlantic
mar. 9/309:35 amLHR - IDA
2 stops19h 50mVirgin Atlantic
Deal found 7/30$633
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/285:10 amGEG - LHR
2 stops19h 00mAir Canada
jue. 11/66:00 pmLHR - GEG
2 stops37h 29mAir Canada
Deal found 7/28$636
This United Airlines deal was found by Cheapflights users on 7/30. 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.
mar. 9/237:00 amIDA - LHR
2 stops19h 35mUnited Airlines
mar. 9/3011:25 amLHR - IDA
1 stop16h 27mUnited Airlines
Deal found 7/30$650

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 julio 30, 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

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

dom. 8/24

2:21 pm-1:10 pm

1 stop14h 49m

London Heathrow

mar. 9/9

6:30 am-2:45 pm

2 stops16h 15m

$609

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

mar. 10/14

2:39 pm-12:20 pm

1 stop14h 41m

London Heathrow

vie. 10/24

4:00 pm-1:33 pm

2 stops28h 33m

$613

BoiseLondon

BOI - LGW

BOILGW

Boise Air Term. Gowen Fld

mié. 9/17

8:00 am-10:55 am

2 stops19h 55m

London Gatwick

lun. 9/22

9:50 am-10:54 pm

1 stop20h 04m

$621

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

mar. 9/23

3:20 pm-1:10 pm

1 stop14h 50m

London Heathrow

mié. 10/1

11:30 am-11:57 pm

2 stops19h 27m

$621

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

dom. 8/3

2:22 pm-1:10 pm

1 stop14h 48m

London Heathrow

mar. 8/19

10:55 am-4:13 pm

1 stop13h 18m

$621

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

mié. 10/1

9:15 am-11:20 am

1 stop18h 05m

London Heathrow

mar. 10/7

6:15 am-4:44 pm

2 stops18h 29m

$622

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mar. 1/20

1:05 pm-10:00 am

1 stop13h 55m

London Heathrow

vie. 1/30

6:20 am-6:15 pm

2 stops18h 55m

$622

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

lun. 1/5

7:05 am-11:00 am

1 stop19h 55m

London Heathrow

mar. 3/10

6:30 am-9:02 pm

2 stops21h 32m

$623

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mar. 1/20

6:45 pm-6:20 am

2 stops28h 35m

London Heathrow

vie. 1/30

6:20 am-10:21 pm

2 stops23h 01m

$626

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

mar. 9/23

9:52 am-9:35 am

2 stops16h 43m

London Heathrow

mié. 10/1

8:30 am-10:30 pm

2 stops21h 00m

$627

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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, November is the cheapest month in which you can book a flight from Idaho to London (average of $661). Flying from Idaho to London in June is currently the most expensive (average of $1,097). 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 julio 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to London as you normally would.

How much does it cost to fly round-trip from Idaho to London?

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated julio 30, 2025.
See what other customers who have flown with Delta, KLM, and United Airlines from Idaho to London have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Scandinavian Airlines
7.3
Good
1,453 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • 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 Delta ($359), Air Canada ($394), and United Airlines ($399).

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

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

  • 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, November is the cheapest month in which you can book a flight from Idaho to London (average of $661). Flying from Idaho to London in June is currently the most expensive (average of $1,097). 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
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Orpington
Watford
Gatwick
Borehamwood
Dartford
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Arundel
Milton Keynes
Bishop's Stortford
Eastbourne

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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 julio 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$555Average$774FlexibilityNo cancel feeOn-time75%
Virgin AtlanticCheapest$644Average$940FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$679Average$980FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$703Average$865FlexibilityNo cancel feeOn-time71%
DeltaCheapest$727Average$1,084FlexibilityNo cancel feeOn-timeN/A

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