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Cheap flights from London to Idaho from £394

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
27 May — 3 Jun1
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 27 April 2026.

Wed 9/908:40
LHR
-
GEG
2 stops33h 55m
United Airlines
Sun 13/911:16
GEG
-
LHR
2 stops26h 19m
United Airlines
Deal found 23/4£653
Wed 4/1106:35
LHR
-
BOI
2 stops19h 41m
United Airlines
Sun 8/1116:05
BOI
-
LHR
1 stop32h 20m
United Airlines
Deal found 23/4£657
Wed 27/519:30
LHR
-
BOI
2 stops34h 28m
Scandinavian Airlines
Wed 3/615:23
BOI
-
LHR
2 stops41h 37m
Scandinavian Airlines
Deal found 27/4£702
Fri 11/907:25
LHR
-
BOI
2 stops20h 54m
United Airlines
Sat 19/905:00
BOI
-
LHR
2 stops19h 55m
United Airlines
Deal found 22/4£718
Fri 11/914:50
LHR
-
BOI
1 stop13h 35m
Lufthansa
Sat 19/914:44
BOI
-
LHR
1 stop14h 41m
Lufthansa
Deal found 22/4£719
Fri 11/906:40
LHR
-
BOI
3 stops18h 55m
Scandinavian Airlines
Sat 19/910:23
BOI
-
LHR
2 stops24h 17m
Scandinavian Airlines
Deal found 22/4£728
Wed 27/511:40
LHR
-
BOI
1 stop19h 18m
Multiple Airlines
Wed 3/618:07
BOI
-
LHR
1 stop14h 28m
Multiple Airlines
Deal found 27/4£740
Wed 16/1206:35
LHR
-
GEG
2 stops25h 03m
Lufthansa
Wed 6/112:30
GEG
-
LHR
1 stop34h 55m
Lufthansa
Deal found 27/4£769
Wed 16/1209:30
LHR
-
GEG
2 stops22h 08m
United Airlines
Wed 6/105:00
GEG
-
LHR
1 stop20h 40m
United Airlines
Deal found 26/4£780
Sat 2/510:20
LGW
-
BOI
2 stops19h 42m
Multiple Airlines
Sun 10/509:02
BOI
-
LGW
2 stops22h 38m
Multiple Airlines
Deal found 27/4£787
Sat 2/510:20
LGW
-
BOI
2 stops19h 42m
Multiple Airlines
Sat 9/514:57
BOI
-
LGW
2 stops16h 43m
Multiple Airlines
Deal found 27/4£793
Mon 4/510:20
LGW
-
BOI
2 stops19h 42m
Multiple Airlines
Thu 14/513:31
BOI
-
LGW
2 stops22h 19m
Multiple Airlines
Deal found 27/4£796

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 27 April 2026.

Round-trip from

£653

One-way from

£394

Popular in

December

Cheapest in

January

Average price

£619
United Airlines
  • United Airlines
  • 9/9-13/9
  • 4 total stops
  • 60h 14m total
  • London to Idaho
Search Deals
7/9
  • 7/9
  • 2 total stops
  • 55h 02m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£43 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 April 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 27 April 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

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 9/9

08:40-10:35

2 stops33h 55m

Spokane

Sun 13/9

11:16-21:35

2 stops26h 19m

£653

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 11/9

07:25-21:19

2 stops20h 54m

Boise Air Term. Gowen Fld

Sat 19/9

14:44-12:25

1 stop14h 41m

£718

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 11/9

06:40-18:35

3 stops18h 55m

Boise Air Term. Gowen Fld

Sat 19/9

10:23-16:25

3 stops23h 02m

£761

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 27/5

07:25-21:40

2 stops21h 15m

Boise Air Term. Gowen Fld

Wed 3/6

08:30-06:45

1 stop15h 15m

£778

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

11:05-23:55

2 stops19h 50m

Boise Air Term. Gowen Fld

Sat 4/7

06:30-10:00

2 stops20h 30m

£797

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

11:25-17:56

1 stop13h 31m

Boise Air Term. Gowen Fld

Sun 5/7

10:20-20:40

2 stops27h 20m

£800

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 25/5

11:05-21:05

2 stops18h 00m

Spokane

Tue 9/6

07:00-08:20

2 stops17h 20m

£803

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

11:05-22:51

1 stop18h 46m

Boise Air Term. Gowen Fld

Sun 5/7

14:41-12:35

1 stop14h 54m

£806

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 9/6

11:05-22:51

1 stop18h 46m

Boise Air Term. Gowen Fld

Tue 16/6

06:30-07:15

2 stops17h 45m

£809

LondonIdaho Falls

LGW - IDA

LGWIDA

London Gatwick

Tue 1/9

13:00-22:56

2 stops16h 56m

Idaho Falls Fanning Field

Fri 25/9

13:45-14:40

2 stops17h 55m

£811

Flights are sorted by cheapest return flights first.

Deals found on 23/4

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
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6

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

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

The best time to book flights from London to Idaho is 82 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.

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 £497). Flying from London to Idaho in July is currently the most expensive (average of £631). 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?

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 27 April 2026.
Get a feel of what it's like to fly with United Airlines,Virgin Atlantic, 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.
United Airlines
7.4
Good
9,672 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,672 reviews
United Airlines
7.4
Good
9,672 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Virgin Atlantic
7.4
Good
688 reviews
United Airlines
7.4
Good
9,672 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Icelandair
7.0
Good
646 reviews
United Airlines
7.4
Good
9,672 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Lufthansa
6.8
Okay
7,956 reviews
United Airlines
7.4
Good
9,672 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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, Scandinavian Airlines, and Lufthansa fly from London to Idaho in about 18h 55m. The time it takes to get you to your destination can typically vary by up to 15h. The distance from London to Idaho is about 4829 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 - Jackson Hole or London Gatwick - Boise Air Term. Gowen Fld, 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 £497). Flying from London to Idaho in July is currently the most expensive (average of £631). 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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Edinburgh to John F Kennedy Intl flights
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Luton to Los Angeles flights
London City to Miami flights
London City to Boston flights
Stansted to LaGuardia flights
Manchester to LaGuardia flights
Gatwick to Dulles Intl flights
Stansted to Boston flights

Top 3 airlines flying from London to Idaho

Discover the top 3 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 27 April 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£503Average£666FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£541Average£855FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£594Average£792FlexibilityNo 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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