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Cheap flights from London to Idaho from £365

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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
5 Mar — 12 Mar1
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 3 February 2026.

Tue 17/306:30
LHR
-
BOI
2 stops19h 55m
Multiple Airlines
Tue 24/311:58
BOI
-
LHR
1 stop16h 32m
Multiple Airlines
Deal found 31/1£542
Tue 3/309:00
LHR
-
BOI
2 stops19h 11m
United Airlines
Tue 10/310:21
BOI
-
LHR
2 stops18h 04m
United Airlines
Deal found 1/2£554
Tue 10/306:35
LHR
-
GEG
2 stops21h 43m
United Airlines
Tue 17/307:02
GEG
-
LHR
1 stop17h 23m
United Airlines
Deal found 2/2£557
Wed 18/308:30
LHR
-
BOI
2 stops20h 26m
United Airlines
Wed 25/310:49
BOI
-
LHR
1 stop19h 11m
United Airlines
Deal found 1/2£558
Tue 17/306:35
LHR
-
BOI
2 stops20h 54m
United Airlines
Tue 24/307:47
BOI
-
LHR
2 stops18h 38m
United Airlines
Deal found 31/1£559
Tue 1/909:30
LHR
-
BOI
2 stops18h 46m
Lufthansa
Tue 15/914:43
BOI
-
LHR
1 stop11h 57m
Lufthansa
Deal found 30/1£561
Tue 1/908:45
LHR
-
BOI
2 stops19h 30m
United Airlines
Tue 15/907:00
BOI
-
LHR
2 stops16h 55m
United Airlines
Deal found 30/1£567
Mon 20/406:55
LHR
-
BOI
2 stops22h 40m
United Airlines
Mon 27/406:15
BOI
-
LHR
1 stop20h 25m
United Airlines
Deal found 2/2£569
Tue 3/310:25
LHR
-
BOI
1 stop15h 22m
Lufthansa
Tue 10/307:47
BOI
-
LHR
1 stop18h 08m
Lufthansa
Deal found 1/2£573
Mon 4/508:40
LHR
-
GEG
2 stops21h 00m
United Airlines
Sun 10/505:00
GEG
-
LHR
2 stops42h 40m
United Airlines
Deal found 2/2£574
Mon 20/418:00
LHR
-
BOI
2 stops24h 49m
Lufthansa
Mon 27/419:03
BOI
-
LHR
2 stops28h 42m
Lufthansa
Deal found 1/2£586
Wed 18/312:20
LHR
-
IDA
1 stop16h 32m
Multiple Airlines
Wed 25/306:00
IDA
-
LHR
2 stops20h 45m
Multiple Airlines
Deal found 1/2£588

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 3 February 2026.

Round-trip from

£520

One-way from

£365

Popular in

December

Cheapest in

January

Average price

£588
11/3-20/3
  • 11/3-20/3
  • 4 total stops
  • 55h 13m total
  • London to Idaho
Search Deals
3/5
  • 3/5
  • 3 total stops
  • 50h 41m 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. 6% potential price decrease (£30 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 3 February 2026.
Use the filters below to find and compare flights from London to Idaho that are best for you.

Fly from

London

Fly to

Idaho

Route

Depart

Return

Price

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 17/3

06:30-20:25

2 stops19h 55m

Boise Air Term. Gowen Fld

Tue 24/3

11:58-10:30

1 stop16h 32m

£542

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 3/3

09:00-21:11

2 stops19h 11m

Boise Air Term. Gowen Fld

Tue 10/3

10:21-10:25

2 stops18h 04m

£554

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 10/3

06:35-21:18

2 stops21h 43m

Spokane

Tue 17/3

06:00-11:05

2 stops22h 05m

£557

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 18/3

08:30-22:56

2 stops20h 26m

Boise Air Term. Gowen Fld

Wed 25/3

10:49-12:00

1 stop19h 11m

£558

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 17/3

06:35-21:29

2 stops20h 54m

Boise Air Term. Gowen Fld

Tue 24/3

07:47-08:25

2 stops18h 38m

£559

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 20/4

09:00-22:35

2 stops20h 35m

Boise Air Term. Gowen Fld

Mon 27/4

05:00-09:40

1 stop21h 40m

£569

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 4/5

08:40-21:40

2 stops21h 00m

Spokane

Sun 10/5

12:35-07:25

1 stop34h 50m

£574

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Mon 20/4

18:00-11:49

2 stops24h 49m

Boise Air Term. Gowen Fld

Mon 27/4

19:03-06:45

2 stops28h 42m

£586

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Tue 10/3

11:55-21:37

2 stops16h 42m

Spokane

Tue 17/3

12:00-10:55

2 stops15h 55m

£590

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 3/3

09:00-21:07

2 stops20h 07m

Spokane

Wed 27/5

06:00-07:25

1 stop17h 25m

£613

Flights are sorted by cheapest return flights first.

Deals found on 1/2

Showing 1-10 of 60 results
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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 £504). Flying from London to Idaho in February is currently the most expensive (average of £698). 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 3 February 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
1,448 reviews
Check prices

Overall

7.7

Crew

8.4

Food

7.3

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
KLM
7.7
Good
1,448 reviews
KLM
7.7
Good
1,448 reviews
Check prices

Overall

7.7

Crew

8.4

Food

7.3

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Virgin Atlantic
7.5
Good
678 reviews
KLM
7.7
Good
1,448 reviews
Check prices

Overall

7.7

Crew

8.4

Food

7.3

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
United Airlines
7.4
Good
9,231 reviews
KLM
7.7
Good
1,448 reviews
Check prices

Overall

7.7

Crew

8.4

Food

7.3

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Lufthansa
6.8
Okay
7,758 reviews
KLM
7.7
Good
1,448 reviews
Check prices

Overall

7.7

Crew

8.4

Food

7.3

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
British Airways
6.7
Okay
7,711 reviews
KLM
7.7
Good
1,448 reviews
Check prices

Overall

7.7

Crew

8.4

Food

7.3

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

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 Finnair fly from London to Idaho in about 16h 42m. The time it takes to get you to your destination can typically vary by up to 12h 16m. 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 - 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, March is the cheapest month in which you can book a flight from London to Idaho (average of £504). Flying from London to Idaho in February is currently the most expensive (average of £698). 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 3 February 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£526Average£653FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£528Average£836FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£589Average£856FlexibilityNo 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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