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Cheap flights from Idaho to London Heathrow Airport from £248

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
1 Jul — 8 Jul1
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 1 June 2026.

Mon 9/1118:55
BOI
-
LHR
1 stop33h 20m
Austrian Airlines
Thu 12/1111:05
LHR
-
BOI
2 stops43h 01m
Austrian Airlines
Deal found 30/5£550
Mon 9/1116:05
BOI
-
LHR
1 stop32h 20m
United Airlines
Thu 12/1106:50
LHR
-
BOI
2 stops23h 16m
United Airlines
Deal found 31/5£559
Wed 2/1209:53
BOI
-
LHR
1 stop19h 27m
Alaska Airlines
Fri 11/1214:45
LHR
-
BOI
1 stop26h 57m
Alaska Airlines
Deal found 29/5£625
Wed 9/910:37
GEG
-
LHR
1 stop20h 28m
Alaska Airlines
Wed 7/1017:00
LHR
-
GEG
1 stop28h 07m
Alaska Airlines
Deal found 29/5£625
Fri 18/911:10
GEG
-
LHR
2 stops18h 25m
Scandinavian Airlines
Sat 26/917:00
LHR
-
GEG
2 stops32h 00m
Scandinavian Airlines
Deal found 31/5£629
Wed 9/913:09
GEG
-
LHR
1 stop14h 01m
United Airlines
Wed 7/1007:25
LHR
-
GEG
2 stops22h 51m
United Airlines
Deal found 29/5£644
Wed 2/1207:00
BOI
-
LHR
2 stops18h 30m
Air Canada
Fri 11/1213:00
LHR
-
BOI
2 stops35h 55m
Air Canada
Deal found 29/5£647
Wed 14/1006:00
GEG
-
LHR
1 stop19h 00m
Iberia
Wed 28/1019:05
LHR
-
GEG
2 stops23h 53m
Iberia
Deal found 30/5£649
Wed 2/1213:43
BOI
-
LHR
1 stop14h 57m
Air France
Fri 11/1208:55
LHR
-
BOI
2 stops18h 22m
Air France
Deal found 29/5£649
Sun 20/911:10
GEG
-
LHR
2 stops26h 30m
Scandinavian Airlines
Mon 28/919:30
LHR
-
GEG
2 stops29h 30m
Scandinavian Airlines
Deal found 30/5£650
Tue 1/917:59
BOI
-
LHR
1 stop14h 36m
Delta
Fri 11/906:30
LHR
-
BOI
2 stops20h 48m
Delta
Deal found 31/5£651
Tue 1/913:01
GEG
-
LHR
1 stop18h 34m
Delta
Wed 9/906:30
LHR
-
GEG
2 stops20h 50m
Delta
Deal found 31/5£651

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 1 June 2026.

Round-trip from

£550

One-way from

£248

Popular in

January

Cheapest in

April

Average price

£999
Austrian Airlines
  • Austrian Airlines
  • 9/11-12/11
  • 3 total stops
  • 76h 21m total
  • Idaho to London
Search Deals
United Airlines
  • United Airlines
  • 9/9
  • 1 total stop
  • 15h 55m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£135 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£48 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 1 June 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

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 9/11

10:39-07:10

2 stops37h 31m

London Heathrow

Thu 12/11

06:50-23:06

2 stops23h 16m

£644

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 9/9

15:54-12:35

1 stop12h 41m

London Heathrow

Wed 7/10

08:40-22:16

2 stops21h 36m

£645

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 26/10

14:35-09:40

1 stop13h 05m

London Heathrow

Fri 30/10

11:10-22:53

2 stops17h 43m

£652

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 3/10

11:30-21:20

2 stops25h 50m

London Heathrow

Tue 27/10

06:35-23:38

2 stops24h 03m

£654

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

14:25-12:35

1 stop15h 10m

London Heathrow

Tue 13/10

07:25-09:53

2 stops33h 28m

£655

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 20/9

11:10-21:40

2 stops26h 30m

London Heathrow

Mon 28/9

19:50-17:00

3 stops29h 10m

£657

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 26/10

13:46-12:20

1 stop16h 34m

London Heathrow

Fri 30/10

14:45-22:54

1 stop14h 09m

£659

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 8/9

13:00-18:50

3 stops21h 50m

London Heathrow

Mon 14/9

19:50-17:00

3 stops29h 10m

£660

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

£663

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Wed 9/9

07:00-05:55

1 stop15h 55m

London Heathrow

Fri 18/9

11:25-17:49

1 stop13h 24m

£672

Flights are sorted by cheapest return flights first.

Deals found on 31/5

Showing 1-10 of 51 resultsSorted by cheapest first
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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, July is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £429). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £935). 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, Delta, and Scandinavian Airlines fly from Idaho to London Heathrow Airport in about 18h 35m. The time it takes to get you to your destination can typically vary by up to 13h 45m. 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 Boise Air Term. Gowen Fld - London Heathrow. You may also consider Spokane - 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, July is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £429). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £935). 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
Hounslow
Milton Keynes
Northampton
Wembley
Luton
Gatwick
Croydon
Ilford
Slough
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Ipswich
Watford
Swindon
Romford
Guildford
Borehamwood

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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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Los Angeles to London City flights
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Baltimore to Gatwick flights
O'Hare Intl to Gatwick flights
San Francisco to Gatwick flights
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O'Hare Intl to Stansted flights
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O'Hare Intl to London City 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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