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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
21 May — 28 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 21 April 2026.

Mon 1/615:40
LGW
-
GEG
2 stops16h 19m
Multiple Airlines
Mon 8/613:59
GEG
-
LGW
2 stops16h 41m
Multiple Airlines
Deal found 17/4£649
Wed 16/910:50
LHR
-
BOI
2 stops31h 10m
United Airlines
Sun 20/919:01
BOI
-
LHR
1 stop29h 24m
United Airlines
Deal found 16/4£661
Fri 25/906:40
LHR
-
BOI
2 stops20h 38m
Scandinavian Airlines
Sun 11/1012:42
BOI
-
LHR
2 stops20h 18m
Scandinavian Airlines
Deal found 19/4£675
Mon 18/519:30
LHR
-
BOI
2 stops34h 28m
Scandinavian Airlines
Tue 2/610:39
BOI
-
LHR
2 stops24h 51m
Scandinavian Airlines
Deal found 18/4£681
Wed 30/907:30
LHR
-
BOI
2 stops23h 22m
United Airlines
Sat 10/1019:05
BOI
-
LHR
2 stops18h 35m
United Airlines
Deal found 19/4£691
Wed 30/914:50
LHR
-
BOI
1 stop13h 41m
Lufthansa
Sat 10/1014:31
BOI
-
LHR
1 stop12h 09m
Lufthansa
Deal found 19/4£696
Fri 25/910:00
LHR
-
BOI
2 stops30h 35m
United Airlines
Sun 11/1014:45
BOI
-
LHR
1 stop33h 40m
United Airlines
Deal found 19/4£714
Tue 2/606:40
LHR
-
GEG
2 stops18h 17m
Scandinavian Airlines
Tue 9/611:19
GEG
-
LHR
2 stops20h 41m
Scandinavian Airlines
Deal found 18/4£718
Wed 1/706:55
LHR
-
BOI
2 stops18h 01m
United Airlines
Wed 30/914:31
BOI
-
LHR
1 stop15h 04m
United Airlines
Deal found 20/4£718
Wed 1/711:25
LHR
-
BOI
1 stop13h 31m
Lufthansa
Wed 30/914:31
BOI
-
LHR
1 stop12h 09m
Lufthansa
Deal found 20/4£721
Mon 1/611:40
LHR
-
GEG
1 stop18h 56m
Multiple Airlines
Mon 8/612:46
GEG
-
LHR
1 stop15h 24m
Multiple Airlines
Deal found 17/4£728
Thu 4/613:05
LHR
-
GEG
2 stops18h 54m
Multiple Airlines
Thu 11/619:56
GEG
-
LHR
2 stops16h 24m
Multiple Airlines
Deal found 20/4£740

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 21 April 2026.

Round-trip from

£649

One-way from

£361

Popular in

December

Cheapest in

January

Average price

£621
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. 7% potential increase in price (£44 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 21 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

LGW - GEG

LGWGEG

London Gatwick

Mon 1/6

15:40-23:59

2 stops16h 19m

Spokane

Mon 8/6

13:59-14:40

2 stops16h 41m

£649

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 2/6

06:40-16:57

2 stops18h 17m

Spokane

Tue 9/6

11:19-16:00

2 stops20h 41m

£718

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 1/7

06:55-17:56

2 stops18h 01m

Boise Air Term. Gowen Fld

Wed 30/9

14:31-12:35

1 stop15h 04m

£718

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 29/9

06:40-18:35

2 stops18h 55m

Boise Air Term. Gowen Fld

Sat 3/10

12:42-17:40

2 stops21h 58m

£726

LondonBoise

LCY - BOI

LCYBOI

London City

Mon 18/5

10:00-23:58

2 stops20h 58m

Boise Air Term. Gowen Fld

Tue 2/6

06:35-16:40

2 stops27h 05m

£772

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Sat 10/10

13:05-22:16

2 stops17h 11m

Spokane

Mon 12/10

12:50-10:10

2 stops37h 20m

£773

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 26/5

06:40-20:34

2 stops20h 54m

Boise Air Term. Gowen Fld

Fri 5/6

10:39-13:35

2 stops19h 56m

£774

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 3/6

08:40-10:27

2 stops33h 47m

Spokane

Wed 10/6

05:00-09:40

1 stop20h 40m

£775

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 2/6

11:05-22:51

1 stop18h 46m

Boise Air Term. Gowen Fld

Wed 1/7

14:41-09:40

1 stop11h 59m

£776

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 3/6

06:55-21:40

2 stops21h 45m

Boise Air Term. Gowen Fld

Wed 10/6

10:41-10:40

2 stops16h 59m

£779

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
...
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 £498). 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 21 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
7.8
Good
1,501 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.7

Food

7.3

Boarding

7.8

Overall

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
1,501 reviews
KLM
7.8
Good
1,501 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.7

Food

7.3

Boarding

7.8

Overall

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
1,501 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.7

Food

7.3

Boarding

7.8

Overall

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
9,611 reviews
KLM
7.8
Good
1,501 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.7

Food

7.3

Boarding

7.8

Overall

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
637 reviews
KLM
7.8
Good
1,501 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.7

Food

7.3

Boarding

7.8

Overall

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
7,935 reviews
KLM
7.8
Good
1,501 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.7

Food

7.3

Boarding

7.8

Overall

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 Scandinavian Airlines, United Airlines, and Icelandair fly from London to Idaho in about 18h 01m. The time it takes to get you to your destination can typically vary by up to 15h 33m. 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 Gatwick - Boise Air Term. Gowen Fld or London Heathrow - Spokane, 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 £498). 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 21 April 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£504Average£667FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£542Average£856FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£595Average£794FlexibilityNo 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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