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Cheap flights from London to Idaho from £399

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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
6 May — 13 May1
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 6 April 2026.

Wed 4/1109:00
LHR
-
GEG
2 stops22h 38m
United Airlines
Sun 8/1112:30
GEG
-
LHR
2 stops41h 00m
United Airlines
Deal found 5/4£657
Tue 5/508:45
LHR
-
BOI
2 stops33h 42m
United Airlines
Tue 19/508:02
BOI
-
LHR
1 stop19h 08m
United Airlines
Deal found 3/4£659
Wed 30/908:40
LHR
-
GEG
2 stops22h 58m
United Airlines
Sun 4/1016:00
GEG
-
LHR
1 stop33h 40m
United Airlines
Deal found 1/4£662
Wed 22/413:05
LHR
-
GEG
2 stops16h 26m
Icelandair
Tue 28/414:45
GEG
-
LHR
2 stops45h 35m
Icelandair
Deal found 3/4£677
Fri 11/910:50
LHR
-
BOI
2 stops20h 00m
United Airlines
Tue 15/911:46
BOI
-
LHR
1 stop19h 24m
United Airlines
Deal found 4/4£691
Wed 22/413:05
LHR
-
GEG
2 stops16h 26m
Icelandair
Wed 29/406:00
GEG
-
LHR
2 stops30h 20m
Icelandair
Deal found 5/4£693
Fri 25/909:30
LHR
-
BOI
2 stops19h 52m
United Airlines
Tue 29/908:40
BOI
-
LHR
2 stops17h 40m
United Airlines
Deal found 1/4£697
Wed 13/509:30
LHR
-
BOI
2 stops18h 47m
Lufthansa
Tue 9/610:41
BOI
-
LHR
1 stop15h 59m
Lufthansa
Deal found 2/4£700
Fri 1/511:25
LHR
-
BOI
1 stop16h 52m
Lufthansa
Fri 8/514:33
BOI
-
LHR
1 stop14h 52m
Lufthansa
Deal found 3/4£703
Tue 28/413:05
LHR
-
BOI
2 stops16h 57m
Icelandair
Tue 12/516:38
BOI
-
LHR
2 stops20h 42m
Icelandair
Deal found 2/4£706
Tue 21/415:40
LGW
-
BOI
2 stops38h 22m
Icelandair
Tue 12/516:38
BOI
-
LGW
2 stops15h 02m
Icelandair
Deal found 2/4£706
Tue 21/413:05
LHR
-
BOI
2 stops40h 57m
Icelandair
Tue 5/512:15
BOI
-
LHR
2 stops16h 40m
Icelandair
Deal found 2/4£710

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 6 April 2026.

Round-trip from

£659

One-way from

£399

Popular in

December

Cheapest in

January

Average price

£635
United Airlines
  • United Airlines
  • 5/5-19/5
  • 4 total stops
  • 52h 32m total
  • London to Idaho
Search Deals
19/5
  • 19/5
  • 3 total stops
  • 20h 28m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£49 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£31 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 6 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

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 5/5

08:45-11:27

2 stops33h 42m

Boise Air Term. Gowen Fld

Tue 19/5

08:02-10:10

1 stop19h 08m

£659

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 30/9

08:40-23:38

2 stops22h 58m

Spokane

Sun 4/10

16:00-09:40

1 stop33h 40m

£662

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 11/9

10:50-23:50

2 stops20h 00m

Boise Air Term. Gowen Fld

Tue 15/9

11:46-14:10

1 stop19h 24m

£691

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 25/9

09:30-22:22

2 stops19h 52m

Boise Air Term. Gowen Fld

Tue 29/9

08:40-09:20

2 stops17h 40m

£697

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 22/4

15:40-23:55

2 stops16h 15m

Spokane

Tue 28/4

14:45-14:40

2 stops15h 55m

£716

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 21/5

09:55-22:52

1 stop20h 57m

Spokane

Thu 28/5

07:00-15:35

2 stops24h 35m

£719
Fastest return journey

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 29/4

15:40-23:55

2 stops16h 15m

Spokane

Mon 4/5

12:40-11:45

2 stops15h 05m

£753

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Fri 12/6

15:40-23:59

2 stops16h 19m

Spokane

Sun 21/6

11:40-11:45

2 stops40h 05m

£758

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 29/4

11:30-21:02

2 stops17h 32m

Spokane

Mon 4/5

14:10-13:05

1 stop14h 55m

£763

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 22/4

09:55-21:05

2 stops19h 10m

Spokane

Wed 29/4

14:10-13:05

1 stop14h 55m

£765

Flights are sorted by cheapest return flights first.

Deals found on 4/4

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, March is the cheapest month in which you can book a flight from London to Idaho (average of £516). Flying from London to Idaho in February is currently the most expensive (average of £692). 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 6 April 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
7.7
Good
1,490 reviews
Check prices

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

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
7.7
Good
1,490 reviews
KLM
7.7
Good
1,490 reviews
Check prices

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

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
685 reviews
KLM
7.7
Good
1,490 reviews
Check prices

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

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
9,546 reviews
KLM
7.7
Good
1,490 reviews
Check prices

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

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
631 reviews
KLM
7.7
Good
1,490 reviews
Check prices

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

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
7,894 reviews
KLM
7.7
Good
1,490 reviews
Check prices

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

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, Icelandair, and Virgin Atlantic fly from London to Idaho in about 16h 15m. The time it takes to get you to your destination can typically vary by up to 17h 27m. 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 - 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, March is the cheapest month in which you can book a flight from London to Idaho (average of £516). Flying from London to Idaho in February is currently the most expensive (average of £692). 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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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 6 April 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£516Average£706FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£555Average£877FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£609Average£853FlexibilityNo 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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