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Cheap flights from Idaho to London Heathrow Airport from £233

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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
28 Apr — 5 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Idaho to Heathrow
Explore the most affordable flight options available from Idaho to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 March 2026.

Sat 3/1010:23
BOI
-
LHR
2 stops24h 17m
Scandinavian Airlines
Mon 12/1006:40
LHR
-
BOI
2 stops23h 28m
Scandinavian Airlines
Deal found 24/3£620
Tue 6/1012:42
BOI
-
LHR
3 stops20h 43m
Scandinavian Airlines
Tue 13/1006:40
LHR
-
BOI
2 stops23h 28m
Scandinavian Airlines
Deal found 24/3£628
Tue 6/1006:44
BOI
-
LHR
1 stop19h 16m
Finnair
Tue 13/1008:55
LHR
-
BOI
1 stop20h 22m
Finnair
Deal found 24/3£644
Wed 12/812:45
GEG
-
LHR
1 stop14h 10m
American Airlines
Tue 15/911:00
LHR
-
GEG
1 stop17h 47m
American Airlines
Deal found 24/3£644
Wed 7/1013:43
IDA
-
LHR
1 stop14h 32m
Multiple Airlines
Wed 14/1012:55
LHR
-
IDA
1 stop15h 27m
Multiple Airlines
Deal found 26/3£645
Mon 5/1014:57
BOI
-
LHR
1 stop14h 18m
Finnair
Wed 13/108:20
LHR
-
BOI
1 stop18h 05m
Finnair
Deal found 25/3£645
Wed 9/912:45
GEG
-
LHR
1 stop16h 05m
Iberia
Wed 7/1006:15
LHR
-
GEG
2 stops22h 32m
Iberia
Deal found 24/3£645
Wed 12/806:00
GEG
-
LHR
1 stop16h 20m
Iberia
Tue 15/906:15
LHR
-
GEG
2 stops22h 32m
Iberia
Deal found 28/3£657
Wed 9/915:30
BOI
-
LHR
1 stop19h 05m
Delta
Wed 16/906:30
LHR
-
BOI
2 stops16h 08m
Delta
Deal found 26/3£660
Tue 29/914:05
GEG
-
LHR
1 stop15h 00m
Virgin Atlantic
Thu 15/1006:30
LHR
-
GEG
2 stops18h 39m
Virgin Atlantic
Deal found 27/3£660
Wed 9/905:20
GEG
-
LHR
1 stop22h 50m
Delta
Wed 7/1011:30
LHR
-
GEG
2 stops19h 18m
Delta
Deal found 26/3£666
Thu 23/414:37
BOI
-
LHR
2 stops20h 03m
Lufthansa
Thu 30/407:25
LHR
-
BOI
2 stops20h 52m
Lufthansa
Deal found 25/3£677

Find flight deals from Idaho to Heathrow

Keep the following information in mind while searching for Idaho to Heathrow flight deals. Data was last updated 29 March 2026.

Round-trip from

£644

One-way from

£233

Popular in

January

Cheapest in

October

Average price

£620
Finnair
  • Finnair
  • 5/8-19/8
  • 2 total stops
  • 37h 18m total
  • Idaho to London
Search Deals
Iberia
  • Iberia
  • 26/7
  • 1 total stop
  • 17h 36m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£174 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£50 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 Heathrow 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 29 March 2026.
Use the filters below to find and compare flights from Idaho to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 26/4

13:46-12:35

1 stop14h 49m

London Heathrow

Tue 12/5

07:25-21:40

2 stops22h 15m

£698

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 28/4

09:26-11:10

1 stop18h 44m

London Heathrow

Tue 12/5

10:50-22:35

2 stops18h 45m

£706

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 12/5

17:26-12:25

1 stop11h 59m

London Heathrow

Tue 19/5

07:25-09:55

2 stops33h 30m

£709

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 12/8

13:38-12:20

1 stop14h 42m

London Heathrow

Tue 15/9

14:05-21:04

2 stops38h 59m

£712

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 15/9

10:50-16:25

3 stops21h 35m

London Heathrow

Sat 26/9

06:40-18:47

2 stops20h 07m

£719

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 17/9

13:44-11:15

1 stop14h 31m

London Heathrow

Fri 25/9

12:55-21:22

1 stop15h 27m

£728
Fastest return journey

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 5/5

13:41-12:25

1 stop14h 44m

London Heathrow

Tue 19/5

14:50-21:16

1 stop14h 26m

£728

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Mon 11/5

13:15-20:10

2 stops23h 55m

London Heathrow

Mon 18/5

11:45-20:15

2 stops39h 30m

£732

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Mon 11/5

07:00-10:25

2 stops20h 25m

London Heathrow

Mon 18/5

07:25-20:58

2 stops20h 33m

£747

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 11/8

10:37-09:40

1 stop16h 03m

London Heathrow

Tue 18/8

13:35-23:50

2 stops41h 15m

£747

Flights are sorted by cheapest return flights first.

Deals found on 24/3

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from Idaho to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow 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 Heathrow Airport

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

Currently, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £469). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £818). 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 Heathrow Airport?

Related info for your journey

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

    Airlines like United Airlines, Scandinavian Airlines, and Virgin Atlantic fly from Idaho to London Heathrow Airport in about 14h 49m. The time it takes to get you to your destination can typically vary by up to 9h 06m. There are 4643 mi between Idaho and London Heathrow Airport. 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 Heathrow Airport?

    The most popular route from Idaho to London Heathrow Airport is Spokane - London Heathrow. You may also consider Boise Air Term. Gowen Fld - London Heathrow or Idaho Falls Fanning Field - London Heathrow.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho to Heathrow 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 Heathrow Airport?

    Currently, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £469). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £818). 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 Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Wembley
Croydon
Northampton
Hounslow
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Eastbourne
Guildford
Watford
Kingston upon Thames
Romford
Ipswich
Swindon
Bedford

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Idaho to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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O'Hare Intl to Stansted flights
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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 Idaho to Heathrow?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Idaho to Heathrow. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights helps you find that perfect flight to Heathrow from Idaho by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Need flexible booking options for your flight to Heathrow from Idaho? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Idaho to Heathrow become cheaper?

Not ready to book yet? You can track prices for flights from Idaho to Heathrow on Cheapflights with our Price Alert feature and get notified when better prices are available.

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