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Cheap flights from Idaho to London from £247

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 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
2 Aug — 9 Aug1
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 3 July 2026.

Sat 14/1114:40
JAC
-
LHR
2 stops45h 55m
Lufthansa
Tue 17/1109:30
LHR
-
JAC
2 stops18h 32m
Lufthansa
Deal found 1/7£585
Sun 15/1110:51
JAC
-
LHR
1 stop15h 49m
United Airlines
Tue 17/1106:35
LHR
-
JAC
2 stops21h 27m
United Airlines
Deal found 1/7£611
Sat 14/1116:25
JAC
-
LHR
1 stop34h 15m
United Airlines
Tue 17/1106:35
LHR
-
JAC
2 stops21h 27m
United Airlines
Deal found 1/7£615
Mon 30/1117:40
IDA
-
LHR
1 stop33h 00m
United Airlines
Thu 3/1206:35
LHR
-
IDA
2 stops33h 53m
United Airlines
Deal found 29/6£618
Sat 14/1114:40
JAC
-
LHR
2 stops58h 25m
Lufthansa
Wed 18/1107:30
LHR
-
JAC
2 stops20h 32m
Lufthansa
Deal found 1/7£636
Tue 17/1114:40
JAC
-
LHR
2 stops49h 15m
Lufthansa
Fri 20/1113:30
LHR
-
JAC
2 stops38h 32m
Lufthansa
Deal found 1/7£638
Wed 7/1013:46
IDA
-
LHR
1 stop16h 59m
Multiple Airlines
Tue 13/1008:15
LHR
-
IDA
2 stops20h 27m
Multiple Airlines
Deal found 1/7£648
Mon 16/1110:51
JAC
-
LHR
2 stops21h 59m
Lufthansa
Fri 20/1107:40
LHR
-
JAC
2 stops20h 22m
Lufthansa
Deal found 1/7£649
Tue 15/912:14
BOI
-
LHR
2 stops22h 26m
Scandinavian Airlines
Mon 28/919:30
LHR
-
BOI
2 stops30h 10m
Scandinavian Airlines
Deal found 3/7£652
Tue 8/912:14
BOI
-
LHR
2 stops20h 46m
Scandinavian Airlines
Tue 22/906:40
LHR
-
BOI
2 stops19h 00m
Scandinavian Airlines
Deal found 30/6£653
Wed 18/1105:00
GEG
-
LHR
1 stop20h 40m
United Airlines
Wed 25/1106:35
LHR
-
GEG
2 stops22h 26m
United Airlines
Deal found 29/6£653
Sun 15/1114:40
JAC
-
LHR
1 stop12h 00m
United Airlines
Thu 19/1106:35
LHR
-
JAC
2 stops21h 27m
United Airlines
Deal found 1/7£654

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 3 July 2026.

Round-trip from

£585

One-way from

£247

Popular in

January

Cheapest in

October

Average price

£1,050
Lufthansa
  • Lufthansa
  • 14/11-17/11
  • 4 total stops
  • 64h 27m total
  • Idaho to London
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 30/9
  • 1 total stop
  • 13h 44m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 33% potential increase in price (£308 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 19% potential price decrease (£101 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 3 July 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

Cheapest return flight

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 30/11

17:40-09:40

1 stop33h 00m

London Heathrow

Thu 3/12

06:35-09:28

2 stops33h 53m

£618

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 7/10

14:44-12:35

1 stop14h 51m

London Heathrow

Tue 13/10

06:55-22:33

2 stops22h 38m

£653

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 29/9

06:25-12:25

1 stop23h 00m

London Heathrow

Wed 7/10

07:25-19:29

2 stops19h 04m

£653

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 8/11

07:00-07:25

1 stop16h 25m

London Heathrow

Thu 12/11

06:35-21:01

2 stops22h 26m

£653

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 18/11

05:00-09:40

1 stop20h 40m

London Heathrow

Wed 25/11

06:35-21:01

2 stops22h 26m

£654

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

10:35-11:35

2 stops18h 00m

London Heathrow

Tue 13/10

06:55-09:53

2 stops33h 58m

£661

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 8/11

06:02-12:20

1 stop22h 18m

London Heathrow

Thu 12/11

14:45-23:59

1 stop17h 14m

£662

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 25/10

05:00-07:10

2 stops19h 10m

London Heathrow

Mon 2/11

11:10-21:05

2 stops41h 55m

£664

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:46-15:05

1 stop18h 19m

London Heathrow

Tue 13/10

17:00-15:35

1 stop29h 35m

£666

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Sun 1/11

14:40-09:40

1 stop12h 00m

London Heathrow

Sun 8/11

07:40-13:29

2 stops36h 49m

£686

Flights are sorted by cheapest return flights first.

Deals found on 29/6

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 £299). Flying from Idaho to London in May is currently the most expensive (average of £514). 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 Idaho to London?

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 17h 10m. United Airlines provides one of the quickest options available for as low as £713. The distance from Idaho to London is about 4655 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 Boise Air Term. Gowen Fld - London Heathrow or Spokane - London Gatwick, Spokane - 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 £299). Flying from Idaho to London in May is currently the most expensive (average of £514). 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?

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Milton Keynes
Luton
Wembley
Gatwick
Croydon
Slough
Ilford
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Eastbourne
Southall
Aylesbury
Romford
Ipswich
Borehamwood
Southend-on-Sea

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Fly with Cheapflights

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How does Cheapflights help users find flights from Idaho to London?

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.

Can Cheapflights find flights from Idaho to London with no change fees?

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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Of course! You can now track prices for flights from Idaho to London 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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