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Cheap flights from London to Idaho from £309

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
22 Dec — 29 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from London to Idaho

Enter your travel dates to find the best prices.

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 22 November 2025.

Fri 5/1212:35LHR - GEG
1 stop31h 55mAmerican Airlines
Mon 8/1205:17GEG - LHR
2 stops18h 03mAmerican Airlines
Deal found 20/11£683
Tue 9/1212:15LHR - BOI
2 stops16h 30mMultiple Airlines
Mon 15/1211:45BOI - LHR
2 stops16h 05mMultiple Airlines
Deal found 21/11£711
Tue 9/1214:45LHR - BOI
1 stop12h 35mVirgin Atlantic
Mon 15/1211:10BOI - LHR
1 stop15h 50mVirgin Atlantic
Deal found 22/11£717
Mon 8/1207:40LHR - BOI
2 stops33h 19mUnited Airlines
Mon 15/1210:40BOI - LHR
1 stop16h 00mUnited Airlines
Deal found 21/11£719
Mon 8/1207:40LHR - BOI
2 stops33h 19mUnited Airlines
Tue 16/1212:16BOI - LHR
1 stop12h 39mUnited Airlines
Deal found 22/11£721
Tue 9/1206:35LHR - BOI
2 stops18h 32mUnited Airlines
Sun 14/1212:16BOI - LHR
1 stop34h 39mUnited Airlines
Deal found 21/11£727
Thu 11/1211:55LGW - BOI
2 stops18h 15mMultiple Airlines
Fri 9/109:02BOI - LGW
2 stops18h 53mMultiple Airlines
Deal found 21/11£737
Sat 6/1206:20LHR - SUN
2 stops22h 44mDelta
Wed 10/1207:30SUN - LHR
2 stops16h 35mDelta
Deal found 20/11£769
Fri 5/1211:20LGW - GEG
2 stops33h 10mAmerican Airlines
Mon 8/1205:17GEG - LGW
2 stops19h 43mAmerican Airlines
Deal found 20/11£776
Wed 10/1208:55LHR - JAC
2 stops19h 34mDelta
Sat 13/1217:50JAC - LHR
2 stops19h 20mDelta
Deal found 20/11£902
Wed 10/1219:10LHR - JAC
2 stops24h 18mAmerican Airlines
Sat 13/1213:04JAC - LHR
2 stops22h 56mAmerican Airlines
Deal found 20/11£915
Fri 5/1206:30LHR - GEG
2 stops21h 40mVirgin Atlantic
Mon 8/1206:00GEG - LHR
2 stops17h 50mVirgin Atlantic
Deal found 21/11£918

Cheap flight deals from London to Idaho

Keep the following information in mind while searching for London to Idaho flight deals. Data was last updated 22 November 2025.

Round-trip from

£559

One-way from

£309

Popular in

December

Cheapest in

September

Average price

£649
United Airlines
  • United Airlines
  • 10/3-17/3
  • 4 total stops
  • 39h 08m total
  • London to Idaho
Search Deals
9/3
  • 9/3
  • 3 total stops
  • 35h 13m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£47 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£22 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 22 November 2025.
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

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 10/3

06:35-21:03

2 stops21h 28m

Spokane

Tue 17/3

06:00-06:40

2 stops17h 40m

£559

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 11/2

06:35-18:07

2 stops18h 32m

Boise Air Term. Gowen Fld

Sun 15/2

12:16-05:55

1 stop34h 39m

£567

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 12/1

10:05-19:16

1 stop17h 11m

Spokane

Wed 28/1

11:25-07:55

1 stop12h 30m

£582

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 9/2

10:05-21:23

1 stop18h 18m

Boise Air Term. Gowen Fld

Thu 19/2

08:00-07:55

1 stop16h 55m

£582

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 11/2

13:35-22:57

1 stop16h 22m

Boise Air Term. Gowen Fld

Wed 18/2

08:00-11:15

1 stop20h 15m

£582

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 9/2

11:35-19:45

1 stop15h 10m

Boise Air Term. Gowen Fld

Wed 18/2

12:16-07:55

1 stop12h 39m

£582

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 10/2

10:05-23:48

1 stop20h 43m

Boise Air Term. Gowen Fld

Wed 18/2

12:16-07:55

1 stop12h 39m

£582

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Tue 10/3

11:55-21:37

2 stops16h 42m

Spokane

Tue 17/3

12:00-10:55

2 stops15h 55m

£585

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 20/4

14:10-16:49

2 stops33h 39m

Boise Air Term. Gowen Fld

Mon 27/4

06:20-06:35

2 stops17h 15m

£586

LondonBoise

LCY - BOI

LCYBOI

London City

Wed 11/2

18:10-21:32

2 stops34h 22m

Boise Air Term. Gowen Fld

Sun 15/2

14:40-17:40

2 stops44h 00m

£604

Flights are sorted by cheapest return flights first.

Deals found on 20/11

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 return 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, May is the cheapest month in which you can book a flight from London to Idaho (average of £552). Flying from London to Idaho in December is currently the most expensive (average of £697). 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 LON to ID?

Find hourly flight availability from London to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 22 November 2025.

A simple way to save on the total cost of your ticket is to fly from London to Idaho in the evening. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the morning.

How much does it cost for a return flight from London to Idaho?

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. 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 Idaho. Reviews last updated 22 November 2025.
Get a feel of what it's like to fly with KLM, Virgin Atlantic, andUnited Airlines from London to Idaho by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,419 reviews
Check prices

Food

7.3

Overall

7.7

Comfort

7.6

Boarding

7.8

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,419 reviews
KLM
7.7
Good
1,419 reviews
Check prices

Food

7.3

Overall

7.7

Comfort

7.6

Boarding

7.8

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
674 reviews
KLM
7.7
Good
1,419 reviews
Check prices

Food

7.3

Overall

7.7

Comfort

7.6

Boarding

7.8

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
United Airlines
7.4
Good
9,033 reviews
KLM
7.7
Good
1,419 reviews
Check prices

Food

7.3

Overall

7.7

Comfort

7.6

Boarding

7.8

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Lufthansa
6.8
Okay
7,579 reviews
KLM
7.7
Good
1,419 reviews
Check prices

Food

7.3

Overall

7.7

Comfort

7.6

Boarding

7.8

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,534 reviews
KLM
7.7
Good
1,419 reviews
Check prices

Food

7.3

Overall

7.7

Comfort

7.6

Boarding

7.8

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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?

    Airlines like United Airlines, Icelandair, and Lufthansa fly from London to Idaho in about 16h 42m. The time it takes to get you to your destination can typically vary by up to 17h 40m. The distance from London to Idaho is about 4667 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    While some choose either London Gatwick - Boise Air Term. Gowen Fld or London Heathrow - Spokane, London Heathrow - Boise Air Term. Gowen Fld is the most popular route from London to Idaho.

  • 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 holiday 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, May is the cheapest month in which you can book a flight from London to Idaho (average of £552). Flying from London to Idaho in December is currently the most expensive (average of £697). 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

Browse thousands of different options on Cheapflights for your next trip

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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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Top 4 airlines flying from London to Idaho

Discover the top 4 airlines that operate flights from London to Idaho. 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 858,174 searches. Data last updated 22 November 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£530Average£654FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£554Average£867FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£556Average£672FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£615Average£880FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Idaho?

Deals for London to Idaho flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from London to Idaho?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from London to Idaho for you. Better yet — we are completely free to use.

Can Cheapflights find flights from London to Idaho with no change fees?

Yes, we can. To see specific flights from London to Idaho with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from London to Idaho become cheaper?

Of course! You can now track prices for flights from London to Idaho and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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