Cheap flights from London to Idaho from £353

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 16/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
17 Oct — 24 Oct1
1 adult
1 adult, Economy

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 17 September 2025.

Round-trip from

£463

One-way from

£387

Popular in

July

Cheapest in

February

Average price

£600
United Airlines
  • United Airlines
  • 30/10-6/11
  • 3 total stops
  • 57h 40m total
  • London to Idaho
27/9
  • 27/9
  • 2 total stops
  • 33h 08m total
  • London to Idaho
Highest demand for flights based on searches. 13% potential increase in price (£81 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£15 potential savings vs. average return price).
Average for round-trip flights in September 2025

Find 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 17 September 2025.

Thu 30/1006:35LHR - GEG
2 stops37h 10mUnited Airlines
Thu 6/1113:47GEG - LHR
2 stops22h 48mUnited Airlines
Deal found 15/9£463
Wed 29/1007:30LHR - GEG
2 stops20h 15mUnited Airlines
Wed 5/1106:00GEG - LHR
1 stop22h 00mUnited Airlines
Deal found 14/9£465
Thu 30/1011:35LHR - GEG
1 stop16h 10mMultiple Airlines
Thu 6/1112:45GEG - LHR
1 stop34h 40mMultiple Airlines
Deal found 15/9£480
Sun 5/1010:35LHR - GEG
1 stop20h 40mMultiple Airlines
Fri 17/1007:15GEG - LHR
1 stop16h 10mMultiple Airlines
Deal found 16/9£482
Fri 31/1011:40LHR - BOI
1 stop16h 28mMultiple Airlines
Mon 10/1108:41BOI - LHR
1 stop18h 59mMultiple Airlines
Deal found 15/9£487
Sun 5/1012:20LHR - GEG
1 stop18h 55mUnited Airlines
Fri 17/1005:05GEG - LHR
2 stops20h 15mUnited Airlines
Deal found 16/9£488
Tue 7/1011:15LHR - BOI
2 stops18h 50mMultiple Airlines
Tue 14/1015:37BOI - LHR
1 stop17h 03mMultiple Airlines
Deal found 15/9£493
Thu 30/1009:40LCY - GEG
2 stops32h 02mMultiple Airlines
Thu 6/1112:45GEG - LCY
2 stops20h 55mMultiple Airlines
Deal found 15/9£495
Fri 17/1010:55LGW - GEG
1 stop19h 41mMultiple Airlines
Tue 21/1013:52GEG - LGW
1 stop37h 03mMultiple Airlines
Deal found 15/9£509
Fri 31/1006:35LHR - BOI
2 stops45h 01mLufthansa
Fri 7/1114:31BOI - LHR
1 stop12h 09mLufthansa
Deal found 16/9£532
Wed 8/1008:25LHR - BOI
2 stops20h 57mAmerican Airlines
Tue 14/1007:00BOI - LHR
1 stop22h 45mAmerican Airlines
Deal found 15/9£533
Wed 24/915:05LGW - BOI
2 stops39h 30mAmerican Airlines
Mon 6/1013:26BOI - LGW
2 stops35h 44mAmerican Airlines
Deal found 15/9£533

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 17 September 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

Thu 30/10

06:35-12:45

2 stops37h 10m

Spokane

Thu 6/11

05:10-09:40

1 stop20h 30m

£463

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 10/3

06:35-13:09

2 stops37h 34m

Spokane

Tue 17/3

14:05-12:00

1 stop14h 55m

£464

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 29/10

07:30-20:45

2 stops20h 15m

Spokane

Wed 5/11

06:00-13:30

2 stops23h 30m

£465

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 23/2

07:30-21:09

2 stops21h 39m

Spokane

Fri 27/2

05:00-09:10

2 stops20h 10m

£465

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 30/10

11:35-20:45

1 stop16h 10m

Spokane

Thu 6/11

12:45-07:25

1 stop34h 40m

£480

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Sun 5/10

10:35-23:15

1 stop20h 40m

Spokane

Fri 17/10

07:15-07:25

1 stop16h 10m

£482

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 10/3

07:40-21:09

2 stops20h 29m

Spokane

Tue 17/3

13:45-10:50

2 stops38h 05m

£485

LondonSpokane

LCY - GEG

LCYGEG

London City

Thu 30/10

09:40-10:42

2 stops32h 02m

Spokane

Thu 6/11

12:45-17:40

2 stops20h 55m

£495

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Fri 17/10

10:55-22:36

1 stop19h 41m

Spokane

Tue 21/10

13:52-10:55

1 stop37h 03m

£509

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 21/11

06:35-09:58

2 stops34h 23m

Boise Air Term. Gowen Fld

Sun 30/11

14:40-07:25

1 stop33h 45m

£537

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 56 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, October is the cheapest month in which you can book a flight from London to Idaho (average of £754). Flying from London to Idaho in August is currently the most expensive (average of £1,152). 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 17 September 2025.

When flying from London to Idaho, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 17 September 2025.
Get a feel of what it's like to fly with KLM, United Airlines, andVirgin Atlantic 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.

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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, Lufthansa, and Virgin Atlantic fly from London to Idaho in about 18h 17m. The time it takes to get you to your destination can typically vary by up to 18h 53m. The distance from London to Idaho is about 4774 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    £353 is the cheapest one-way deal found within the past few days, from Iberia. You may also be able to find cheap deals on Lufthansa and Delta, with prices starting from £458 and £491, respectively.

  • What are the most popular routes 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, October is the cheapest month in which you can book a flight from London to Idaho (average of £754). Flying from London to Idaho in August is currently the most expensive (average of £1,152). 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.

Top 5 airlines flying from London to Idaho

Discover the top 5 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 17 September 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£509Average£628FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£522Average£620FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£532Average£840FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£533Average£613FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£590Average£814FlexibilityNo 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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