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Cheap flights from London to Idaho from £430

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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
4 Jun — 11 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 5 May 2026.

Wed 9/908:40
LHR
-
GEG
2 stops33h 55m
United Airlines
Sun 13/916:00
GEG
-
LHR
1 stop33h 40m
United Airlines
Deal found 30/4£655
Wed 16/908:40
LHR
-
GEG
2 stops20h 36m
United Airlines
Sun 20/913:38
GEG
-
LHR
2 stops37h 57m
United Airlines
Deal found 4/5£656
Tue 1/906:55
LHR
-
GEG
2 stops22h 09m
United Airlines
Tue 8/905:00
GEG
-
LHR
2 stops18h 55m
United Airlines
Deal found 3/5£661
Wed 18/1106:35
LHR
-
BOI
2 stops18h 20m
United Airlines
Tue 1/1218:55
BOI
-
LHR
1 stop29h 30m
United Airlines
Deal found 2/5£662
Wed 18/1111:35
LHR
-
BOI
1 stop13h 20m
Lufthansa
Tue 1/1214:43
BOI
-
LHR
1 stop11h 57m
Lufthansa
Deal found 2/5£672
Tue 1/914:50
LHR
-
GEG
1 stop14h 14m
Lufthansa
Tue 8/913:38
GEG
-
LHR
1 stop14h 47m
Lufthansa
Deal found 3/5£674
Wed 30/911:25
LHR
-
BOI
1 stop13h 33m
United Airlines
Sun 4/1019:05
BOI
-
LHR
1 stop29h 20m
United Airlines
Deal found 29/4£681
Sat 5/906:40
LHR
-
BOI
2 stops20h 38m
Scandinavian Airlines
Tue 22/912:42
BOI
-
LHR
2 stops20h 18m
Scandinavian Airlines
Deal found 2/5£689
Sat 14/1106:35
LHR
-
BOI
2 stops18h 20m
United Airlines
Tue 1/1207:00
BOI
-
LHR
1 stop19h 40m
United Airlines
Deal found 2/5£692
Fri 13/1109:30
LHR
-
BOI
2 stops18h 46m
United Airlines
Tue 1/1210:39
BOI
-
LHR
2 stops18h 21m
United Airlines
Deal found 2/5£693
Sat 5/914:50
LHR
-
BOI
1 stop13h 35m
Lufthansa
Tue 22/914:44
BOI
-
LHR
1 stop11h 56m
Lufthansa
Deal found 2/5£701
Sat 5/906:55
LHR
-
BOI
2 stops17h 58m
Lufthansa
Sat 19/914:44
BOI
-
LHR
1 stop11h 56m
Lufthansa
Deal found 2/5£716

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 5 May 2026.

Round-trip from

£654

One-way from

£430

Popular in

December

Cheapest in

January

Average price

£698
United Airlines
  • United Airlines
  • 9/9-13/9
  • 3 total stops
  • 67h 35m total
  • London to Idaho
Search Deals
United Airlines
  • United Airlines
  • 6/7
  • 1 total stop
  • 17h 55m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£42 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 5 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

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 16/9

08:40-21:16

2 stops20h 36m

Spokane

Sun 20/9

13:38-11:35

2 stops37h 57m

£656

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 1/9

06:55-21:04

2 stops22h 09m

Spokane

Tue 8/9

06:00-07:25

1 stop17h 25m

£661

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 30/9

11:25-17:58

1 stop13h 33m

Boise Air Term. Gowen Fld

Sun 4/10

14:45-07:25

1 stop33h 40m

£682

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Sat 30/5

06:40-16:57

2 stops18h 17m

Spokane

Sat 6/6

11:05-16:25

3 stops21h 20m

£732

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 9/9

15:40-23:59

2 stops16h 19m

Spokane

Sun 13/9

12:30-14:40

2 stops18h 10m

£743

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Sat 5/9

15:40-22:33

2 stops37h 53m

Boise Air Term. Gowen Fld

Tue 22/9

16:17-14:40

2 stops15h 23m

£755

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Tue 2/6

13:00-21:18

2 stops16h 18m

Spokane

Sat 6/6

06:00-11:45

2 stops21h 45m

£768

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 15/6

07:30-23:14

2 stops23h 44m

Spokane

Mon 22/6

16:08-07:55

2 stops31h 47m

£778

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Sat 5/9

15:40-22:33

2 stops37h 53m

Boise Air Term. Gowen Fld

Sat 19/9

16:17-14:40

2 stops15h 23m

£780

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 1/6

07:25-21:40

2 stops21h 15m

Boise Air Term. Gowen Fld

Thu 2/7

05:00-06:55

2 stops18h 55m

£780

Flights are sorted by cheapest return flights first.

Deals found on 2/5

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 £496). 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 5 May 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
9,683 reviews
Check prices

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
9,683 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
9,683 reviews
Check prices

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
650 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
7,972 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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, Icelandair, and Alaska Airlines fly from London to Idaho in about 16h 19m. The time it takes to get you to your destination can typically vary by up to 13h 18m. 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 Heathrow - Boise Air Term. Gowen Fld or London Heathrow - Idaho Falls Fanning Field, London Gatwick - 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 £496). 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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Stansted to San Francisco flights
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London City to San Francisco 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 5 May 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£503Average£665FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£541Average£854FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£594Average£825FlexibilityNo 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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