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Cheap flights from London to Idaho from £361

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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
18 mai — 25 mai1
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 18 avril 2026.

lun. 1/615:40
LGW
-
GEG
2 stops16h 19m
Multiple Airlines
lun. 8/613:59
GEG
-
LGW
2 stops16h 41m
Multiple Airlines
Deal found 17/4£648
mer. 16/910:50
LHR
-
BOI
2 stops20h 00m
United Airlines
dim. 20/910:37
BOI
-
LHR
2 stops38h 08m
United Airlines
Deal found 13/4£656
sam. 5/906:40
LHR
-
BOI
2 stops18h 55m
Scandinavian Airlines
sam. 19/910:23
BOI
-
LHR
2 stops24h 17m
Scandinavian Airlines
Deal found 14/4£691
sam. 31/1011:10
LHR
-
BOI
2 stops37h 45m
Lufthansa
sam. 14/1117:22
BOI
-
LHR
2 stops59h 28m
Lufthansa
Deal found 14/4£702
sam. 21/1107:30
LHR
-
BOI
2 stops20h 46m
Lufthansa
sam. 5/1217:22
BOI
-
LHR
2 stops59h 28m
Lufthansa
Deal found 14/4£703
ven. 9/1014:50
LHR
-
BOI
1 stop13h 26m
Lufthansa
ven. 23/1010:39
BOI
-
LHR
1 stop16h 01m
Lufthansa
Deal found 14/4£712
ven. 29/506:40
LHR
-
GEG
2 stops20h 03m
Scandinavian Airlines
ven. 5/613:11
GEG
-
LHR
2 stops18h 49m
Scandinavian Airlines
Deal found 14/4£720
sam. 30/506:40
LHR
-
BOI
2 stops20h 54m
Scandinavian Airlines
sam. 6/612:15
BOI
-
LHR
3 stops23h 35m
Scandinavian Airlines
Deal found 15/4£722
lun. 4/519:15
LHR
-
GEG
2 stops31h 08m
Virgin Atlantic
lun. 18/516:15
GEG
-
LHR
1 stop11h 55m
Virgin Atlantic
Deal found 15/4£727
ven. 29/515:40
LGW
-
GEG
2 stops16h 19m
Multiple Airlines
ven. 5/615:00
GEG
-
LGW
2 stops15h 40m
Multiple Airlines
Deal found 14/4£742
lun. 4/516:10
LHR
-
GEG
1 stop30h 09m
American Airlines
mar. 2/605:44
GEG
-
LHR
2 stops20h 31m
American Airlines
Deal found 16/4£744
jeu. 7/511:25
LHR
-
JAC
1 stop16h 33m
United Airlines
lun. 18/516:15
JAC
-
LHR
1 stop13h 10m
United Airlines
Deal found 13/4£761

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 18 avril 2026.

Round-trip from

£648

One-way from

£361

Popular in

December

Cheapest in

January

Average price

£620
1/6-8/6
  • 1/6-8/6
  • 4 total stops
  • 33h 00m total
  • London to Idaho
Search Deals
20/5
  • 20/5
  • 3 total stops
  • 39h 23m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£46 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 18 avril 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

LGW - GEG

LGWGEG

London Gatwick

lun. 1/6

15:40-23:59

2 stops16h 19m

Spokane

lun. 8/6

13:59-14:40

2 stops16h 41m

£648

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

mer. 16/9

10:50-23:50

2 stops20h 00m

Boise Air Term. Gowen Fld

dim. 20/9

10:37-07:45

2 stops38h 08m

£656

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

ven. 9/10

07:25-17:55

2 stops17h 30m

Boise Air Term. Gowen Fld

ven. 23/10

05:00-06:55

2 stops18h 55m

£715

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

ven. 29/5

06:40-18:43

2 stops20h 03m

Spokane

ven. 5/6

13:11-16:00

2 stops18h 49m

£720

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

mar. 29/9

06:40-18:35

2 stops18h 55m

Boise Air Term. Gowen Fld

sam. 3/10

10:23-16:00

2 stops22h 37m

£726

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

ven. 29/5

15:40-23:59

2 stops16h 19m

Spokane

ven. 5/6

15:00-14:40

2 stops15h 40m

£742

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

sam. 5/9

06:40-20:18

2 stops20h 38m

Boise Air Term. Gowen Fld

sam. 19/9

10:23-16:25

3 stops23h 02m

£746

LondonJackson

LHR - JAC

LHRJAC

London Heathrow

jeu. 7/5

11:25-20:58

1 stop16h 33m

Jackson Hole

lun. 18/5

16:15-12:25

1 stop13h 10m

£761

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

mar. 28/4

13:00-23:55

2 stops18h 55m

Spokane

mar. 19/5

12:46-14:40

2 stops17h 54m

£772

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

mar. 28/4

13:05-21:31

2 stops16h 26m

Spokane

mar. 19/5

12:46-11:55

2 stops15h 09m

£773

Flights are sorted by cheapest return flights first.

Deals found on 17/4

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

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 £632). 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 18 avril 2026.
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
7.8
Good
1,502 reviews
Check prices

Crew

8.4

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.8

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.8
Good
1,502 reviews
KLM
7.8
Good
1,502 reviews
Check prices

Crew

8.4

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.8

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Virgin Atlantic
7.5
Good
687 reviews
KLM
7.8
Good
1,502 reviews
Check prices

Crew

8.4

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.8

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
United Airlines
7.4
Good
9,603 reviews
KLM
7.8
Good
1,502 reviews
Check prices

Crew

8.4

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.8

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Icelandair
7.0
Good
634 reviews
KLM
7.8
Good
1,502 reviews
Check prices

Crew

8.4

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.8

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Lufthansa
6.8
Okay
7,930 reviews
KLM
7.8
Good
1,502 reviews
Check prices

Crew

8.4

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.8

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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 Icelandair 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 1h 08m. 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 - Idaho Falls Fanning Field, 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 £632). 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

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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 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 18 avril 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£504Average£666FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£542Average£855FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£595Average£793FlexibilityNo 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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