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Cheap flights from London to Idaho from £364

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 18/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
28 Jun — 5 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap 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 29 May 2026.

Wed 4/1111:10
LHR
-
BOI
2 stops18h 55m
United Airlines
Sun 8/1116:05
BOI
-
LHR
1 stop32h 20m
United Airlines
Deal found 28/5£660
Sat 26/908:30
LHR
-
BOI
2 stops21h 30m
Multiple Airlines
Sat 10/1007:26
BOI
-
LHR
2 stops19h 34m
Multiple Airlines
Deal found 25/5£680
Sun 20/920:25
LHR
-
GEG
2 stops32h 49m
Lufthansa
Sun 18/1012:50
GEG
-
LHR
1 stop34h 35m
Lufthansa
Deal found 27/5£688
Thu 10/907:25
LHR
-
GEG
2 stops23h 16m
United Airlines
Mon 14/915:54
GEG
-
LHR
1 stop33h 46m
United Airlines
Deal found 24/5£691
Sat 26/911:25
LHR
-
BOI
1 stop13h 33m
Lufthansa
Sat 10/1012:29
BOI
-
LHR
1 stop16h 26m
Lufthansa
Deal found 25/5£719
Mon 22/611:25
LHR
-
BOI
1 stop17h 10m
United Airlines
Sun 28/608:25
BOI
-
LHR
1 stop17h 35m
United Airlines
Deal found 26/5£727
Sat 26/906:40
LHR
-
BOI
2 stops22h 45m
Scandinavian Airlines
Sat 10/1012:42
BOI
-
LHR
3 stops21h 18m
Scandinavian Airlines
Deal found 25/5£733
Tue 7/707:30
LHR
-
BOI
2 stops17h 26m
Lufthansa
Tue 14/714:40
BOI
-
LHR
1 stop12h 00m
Lufthansa
Deal found 25/5£754
Sun 20/917:00
LHR
-
GEG
1 stop23h 33m
Alaska Airlines
Sun 18/1013:49
GEG
-
LHR
1 stop17h 16m
Alaska Airlines
Deal found 27/5£764
Mon 8/621:25
LHR
-
GEG
2 stops31h 53m
Icelandair
Tue 7/719:45
GEG
-
LHR
2 stops40h 35m
Icelandair
Deal found 24/5£765
Wed 1/710:35
LHR
-
GEG
1 stop20h 29m
Lufthansa
Wed 15/712:37
GEG
-
LHR
1 stop14h 33m
Lufthansa
Deal found 28/5£777
Tue 23/613:00
LGW
-
BOI
2 stops16h 24m
Icelandair
Sat 4/718:10
BOI
-
LGW
2 stops37h 30m
Icelandair
Deal found 28/5£813

Find flight deals from London to Idaho

Keep the following information in mind while searching for London to Idaho flight deals. Data was last updated 29 May 2026.

Round-trip from

£660

One-way from

£364

Popular in

December

Cheapest in

January

Average price

£677
United Airlines
  • United Airlines
  • 4/11-8/11
  • 3 total stops
  • 51h 15m total
  • London to Idaho
Search Deals
18/8
  • 18/8
  • 3 total stops
  • 45h 27m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£50 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
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 29 May 2026.
Use the filters below to find and compare flights from London to Idaho that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 4/11

11:10-23:05

2 stops18h 55m

Boise Air Term. Gowen Fld

Sun 8/11

16:05-07:25

1 stop32h 20m

£660

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 10/9

07:25-22:41

2 stops23h 16m

Spokane

Mon 14/9

13:09-14:10

1 stop17h 01m

£691

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

13:00-13:08

1 stop31h 08m

Boise Air Term. Gowen Fld

Sun 5/7

12:28-06:45

1 stop35h 17m

£777

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 25/8

06:55-20:46

2 stops21h 51m

Spokane

Wed 2/9

13:04-07:25

1 stop34h 21m

£780

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

08:00-21:40

2 stops20h 40m

Boise Air Term. Gowen Fld

Sat 4/7

07:00-10:10

1 stop20h 10m

£803

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Tue 23/6

13:00-22:24

2 stops16h 24m

Boise Air Term. Gowen Fld

Sat 4/7

18:10-14:40

2 stops37h 30m

£813

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 1/7

09:30-21:05

2 stops19h 35m

Spokane

Wed 15/7

05:00-05:55

2 stops16h 55m

£814

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sat 22/8

08:00-17:58

2 stops16h 58m

Boise Air Term. Gowen Fld

Wed 2/9

19:05-07:25

1 stop29h 20m

£835

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Sat 26/9

10:20-22:38

2 stops19h 18m

Boise Air Term. Gowen Fld

Sat 10/10

14:08-14:40

2 stops17h 32m

£840

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Tue 25/8

13:00-23:59

2 stops18h 59m

Spokane

Wed 2/9

15:44-14:40

2 stops38h 56m

£842

Flights are sorted by cheapest return flights first.

Deals found on 26/5

Showing 1-10 of 60 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from London to Idaho (average of £502). Flying from London to Idaho in July is currently the most expensive (average of £659). 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.

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

How far ahead should I book a flight from London to Idaho?

The best time to book flights from London to Idaho is 75 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 29 May 2026.
Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andIcelandair 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.
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.9

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
689 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.9

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
United Airlines
7.4
Good
9,760 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.9

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Icelandair
7.0
Good
661 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.9

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Lufthansa
6.8
Okay
8,032 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.9

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

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 Icelandair fly from London to Idaho in about 16h 24m. The time it takes to get you to your destination can typically vary by up to 14h 44m. The distance from London to Idaho is about 4853 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 Heathrow - Idaho Falls Fanning Field or London Heathrow - Jackson Hole, 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, January is the cheapest month in which you can book a flight from London to Idaho (average of £502). Flying from London to Idaho in July is currently the most expensive (average of £659). 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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London City to Orlando flights
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Heathrow to Ontario flights
Heathrow to Denver flights

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 29 May 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£508Average£695FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£547Average£681FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£600Average£835FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£835Average£1,118FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines 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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