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Cheap flights from Idaho to London Heathrow Airport from £246

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
19 Jun — 26 Jun1
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 20 May 2026.

Tue 10/1106:20
BOI
-
LHR
1 stop21h 55m
United Airlines
Thu 12/1106:50
LHR
-
BOI
2 stops23h 16m
United Airlines
Deal found 17/5£557
Tue 10/1111:30
GEG
-
LHR
1 stop16h 30m
United Airlines
Thu 12/1106:35
LHR
-
GEG
2 stops22h 34m
United Airlines
Deal found 19/5£559
Wed 9/915:54
GEG
-
LHR
1 stop12h 41m
United Airlines
Wed 7/1008:40
LHR
-
GEG
2 stops33h 50m
United Airlines
Deal found 17/5£642
Tue 18/814:20
IDA
-
LHR
1 stop13h 35m
American Airlines
Tue 25/808:15
LHR
-
IDA
2 stops20h 05m
American Airlines
Deal found 19/5£649
Tue 8/912:53
GEG
-
LHR
1 stop17h 32m
Iberia
Tue 15/906:15
LHR
-
GEG
2 stops22h 32m
Iberia
Deal found 18/5£652
Tue 29/914:45
BOI
-
LHR
1 stop17h 50m
Delta
Wed 7/1006:30
LHR
-
BOI
2 stops19h 03m
Delta
Deal found 19/5£653
Wed 23/907:00
GEG
-
LHR
1 stop22h 05m
Delta
Wed 14/1006:30
LHR
-
GEG
2 stops17h 36m
Delta
Deal found 19/5£653
Tue 29/914:31
BOI
-
LHR
1 stop14h 54m
United Airlines
Wed 7/1006:55
LHR
-
BOI
2 stops19h 18m
United Airlines
Deal found 19/5£653
Sun 27/912:42
BOI
-
LHR
1 stop16h 28m
Delta
Wed 30/911:45
LHR
-
BOI
2 stops17h 15m
Delta
Deal found 16/5£655
Wed 7/1010:35
IDA
-
LHR
1 stop19h 00m
United Airlines
Tue 13/1007:25
LHR
-
IDA
2 stops33h 28m
United Airlines
Deal found 19/5£657
Sat 26/917:40
GEG
-
LHR
1 stop34h 30m
Delta
Thu 8/1006:30
LHR
-
GEG
2 stops16h 15m
Delta
Deal found 19/5£657
Tue 18/814:20
IDA
-
LHR
1 stop13h 35m
Multiple Airlines
Tue 25/812:55
LHR
-
IDA
1 stop15h 25m
Multiple Airlines
Deal found 19/5£674

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 20 May 2026.

Round-trip from

£557

One-way from

£246

Popular in

January

Cheapest in

April

Average price

£621
United Airlines
  • United Airlines
  • 10/11-12/11
  • 3 total stops
  • 59h 32m total
  • Idaho to London
Search Deals
Virgin Atlantic
  • Virgin Atlantic
  • 15/9
  • 2 total stops
  • 16h 05m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£139 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 May 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 20 May 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

Tue 10/11

12:29-12:00

1 stop16h 31m

London Heathrow

Thu 12/11

11:05-23:06

2 stops43h 01m

£557

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 10/11

11:30-12:00

1 stop16h 30m

London Heathrow

Thu 12/11

06:35-21:09

2 stops22h 34m

£559

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 18/8

14:20-10:55

1 stop13h 35m

London Heathrow

Tue 25/8

08:15-21:20

2 stops20h 05m

£649

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 23/9

06:30-15:00

1 stop24h 30m

London Heathrow

Fri 2/10

06:30-19:20

2 stops20h 50m

£654

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 5/10

15:05-15:35

1 stop16h 30m

London Heathrow

Thu 28/1

06:30-14:45

2 stops16h 15m

£655

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

£656

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 5/10

05:00-10:00

2 stops21h 00m

London Heathrow

Thu 28/1

06:35-23:38

2 stops25h 03m

£658

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 15/9

10:23-18:30

2 stops25h 07m

London Heathrow

Mon 28/9

19:50-18:35

3 stops29h 45m

£659

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 10/11

16:21-12:20

1 stop12h 59m

London Heathrow

Thu 12/11

14:45-23:51

1 stop16h 06m

£661

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 10/11

12:41-12:20

1 stop15h 39m

London Heathrow

Thu 12/11

14:45-22:56

1 stop16h 11m

£661

Flights are sorted by cheapest return flights first.

Deals found on 15/5

Showing 1-10 of 50 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 £430). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £938). 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, American Airlines, and Virgin Atlantic fly from Idaho to London Heathrow Airport in about 13h 35m. The time it takes to get you to your destination can typically vary by up to 10h 55m. There are 4705 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 Jackson Hole - 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 £430). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £938). 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
Croydon
Northampton
Wembley
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Watford
Romford
Kingston upon Thames
Eastbourne
Ipswich
Swindon
Guildford
Southall

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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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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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