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Cheap flights from Idaho to London from £235

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
4 Apr — 11 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to London

Enter your travel dates to find the best prices.

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 March 2026.

Fri 18/912:42
BOI
-
LHR
2 stops37h 38m
Scandinavian Airlines
Thu 29/1019:30
LHR
-
BOI
2 stops33h 38m
Scandinavian Airlines
Deal found 1/3£529
Tue 15/913:00
GEG
-
LHR
2 stops19h 00m
Scandinavian Airlines
Sat 26/906:40
LHR
-
GEG
2 stops20h 07m
Scandinavian Airlines
Deal found 1/3£529
Tue 6/1012:42
BOI
-
LHR
2 stops22h 48m
Scandinavian Airlines
Tue 20/1007:05
LHR
-
BOI
3 stops23h 03m
Scandinavian Airlines
Deal found 3/3£548
Tue 29/910:23
BOI
-
LHR
2 stops22h 37m
Scandinavian Airlines
Tue 6/1006:40
LHR
-
BOI
2 stops18h 53m
Scandinavian Airlines
Deal found 4/3£549
Tue 22/912:42
BOI
-
LHR
2 stops21h 58m
Scandinavian Airlines
Mon 5/1018:40
LHR
-
BOI
2 stops32h 37m
Scandinavian Airlines
Deal found 2/3£551
Fri 2/1012:42
BOI
-
LHR
2 stops37h 38m
Scandinavian Airlines
Tue 6/1006:40
LHR
-
BOI
2 stops20h 37m
Scandinavian Airlines
Deal found 4/3£553
Fri 25/913:00
GEG
-
LHR
2 stops36h 20m
Scandinavian Airlines
Fri 9/1006:40
LHR
-
GEG
2 stops20h 08m
Scandinavian Airlines
Deal found 4/3£553
Fri 18/912:42
BOI
-
LHR
2 stops37h 38m
Scandinavian Airlines
Sat 10/1006:40
LHR
-
BOI
2 stops18h 53m
Scandinavian Airlines
Deal found 1/3£554
Sun 27/913:00
GEG
-
LHR
2 stops24h 40m
Scandinavian Airlines
Fri 9/1006:40
LHR
-
GEG
2 stops18h 29m
Scandinavian Airlines
Deal found 4/3£570
Sat 15/812:42
BOI
-
LHR
2 stops21h 58m
Scandinavian Airlines
Wed 19/807:05
LHR
-
BOI
3 stops22h 59m
Scandinavian Airlines
Deal found 2/3£571
Tue 22/910:23
BOI
-
LHR
2 stops24h 17m
Scandinavian Airlines
Sat 10/1006:40
LHR
-
BOI
2 stops18h 53m
Scandinavian Airlines
Deal found 1/3£571
Sun 27/912:42
BOI
-
LHR
2 stops37h 38m
Scandinavian Airlines
Mon 5/1010:20
LHR
-
BOI
2 stops40h 57m
Scandinavian Airlines
Deal found 4/3£575

Find flight deals from Idaho to London

Keep the following information in mind while searching for Idaho to London flight deals. Data was last updated 5 March 2026.

Round-trip from

£554

One-way from

£235

Popular in

January

Cheapest in

October

Average price

£589
Scandinavian Airlines
  • Scandinavian Airlines
  • 15/8-19/8
  • 4 total stops
  • 64h 54m total
  • Idaho to London
Search Deals
9/8
  • 9/8
  • 2 total stops
  • 29h 41m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£167 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£49 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Idaho to London 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 March 2026.
Use the filters below to find and compare flights from Idaho to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SpokaneLondon

GEG - LGW

GEGLGW

Spokane

Sun 3/5

09:55-14:40

2 stops20h 45m

London Gatwick

Mon 18/5

15:40-21:18

2 stops37h 38m

£624

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Tue 21/4

13:00-11:00

1 stop15h 00m

London Heathrow

Tue 28/4

06:30-16:13

2 stops16h 43m

£626

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 12/8

16:00-12:20

1 stop12h 20m

London Heathrow

Tue 1/9

07:25-22:22

2 stops22h 57m

£626

SpokaneLondon

GEG - LCY

GEGLCY

Spokane

Wed 12/8

13:38-17:55

2 stops20h 17m

London City

Tue 1/9

09:15-21:04

2 stops19h 49m

£630

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 27/4

09:26-07:25

1 stop14h 59m

London Heathrow

Mon 4/5

17:50-22:50

2 stops36h 00m

£636

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 14/4

13:09-11:00

1 stop14h 51m

London Heathrow

Tue 21/4

06:30-18:17

2 stops18h 47m

£639

SpokaneLondon

GEG - LGW

GEGLGW

Spokane

Sat 2/5

14:45-14:40

2 stops39h 55m

London Gatwick

Wed 20/5

15:40-14:16

2 stops30h 36m

£646

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 27/4

13:52-12:10

1 stop15h 18m

London Heathrow

Wed 6/5

12:25-20:29

1 stop15h 04m

£648

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 7/4

13:10-11:00

1 stop14h 50m

London Heathrow

Tue 14/4

06:30-18:17

2 stops18h 47m

£648

SpokaneLondon

GEG - LGW

GEGLGW

Spokane

Wed 15/4

06:00-14:40

2 stops24h 40m

London Gatwick

Wed 22/4

15:40-23:55

2 stops16h 15m

£653

Flights are sorted by cheapest return flights first.

Deals found on 3/3

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London from Idaho 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 Idaho to London

What is the cheapest month to book a flight from Idaho to London?

Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of £466). Flying from Idaho to London in June is currently the most expensive (average of £812). 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.

Related info for your journey

Find useful and relevant information for your journey from Idaho to London. 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 Idaho to London?

    A quick flight from Idaho to London can take about 15h. Icelandair provides one of the quickest options available for as low as £626. The distance from Idaho to London is about 4658 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Idaho to London?

    While some choose either Spokane - London Heathrow or Spokane - London Gatwick, Boise Air Term. Gowen Fld - London Heathrow is the most popular route from Idaho to London.

  • Can I find deals for flights from Idaho to London that include hotel bookings?

    Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Idaho to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.

  • Can I find deals for business class flights from Idaho to London?

    Yes. Cheapflights offers flight deals from Idaho to London 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 Idaho to London?

    Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of £466). Flying from Idaho to London in June is currently the most expensive (average of £812). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Milton Keynes
Croydon
Wembley
Luton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Eastbourne
Chelmsford
Ipswich
Bedford
Romford
Southend-on-Sea

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Alternative routes for Idaho to London

See prices for flight routes from nearby airports that may be better suited for you.
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Fly with Cheapflights

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When you search for this flight from Idaho to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Idaho to London?

Millions of users choose and trust Cheapflights to book the best flight deals from Idaho to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Idaho to London flexibly with Cheapflights today.

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