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Cheap flights from Idaho to London Heathrow Airport from £245

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 18/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
9 Sep — 16 Sep1
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 10 August 2026.

Wed 9/1206:00 -
1 stop23h 20m
Tue 12/114:45 -
1 stop16h 26m
Deal found 6/8£634
Tue 8/1209:40 -
2 stops15h 15m
Tue 12/111:35 -
1 stop15h 00m
Deal found 7/8£645
Wed 18/1106:00 -
1 stop16h 50m
Wed 25/1119:40 -
2 stops24h 30m
Deal found 10/8£647
Wed 18/1112:37 -
1 stop16h 23m
Wed 25/1106:35 -
2 stops21h 40m
Deal found 9/8£650
Sun 6/1209:53 -
1 stop19h 27m
Fri 15/114:45 -
1 stop14h 35m
Deal found 7/8£651
Sun 6/1209:53 -
1 stop19h 27m
Thu 14/114:45 -
1 stop14h 35m
Deal found 6/8£652
Mon 7/1207:00 -
1 stop19h 40m
Fri 11/1206:35 -
2 stops33h 53m
Deal found 6/8£654
Mon 16/1111:22 -
1 stop16h 38m
Wed 18/1113:00 -
2 stops31h 29m
Deal found 6/8£656
Mon 7/1206:15 -
1 stop23h 05m
Fri 11/1214:45 -
1 stop14h 54m
Deal found 6/8£658
Wed 18/1112:49 -
1 stop16h 31m
Wed 25/1114:45 -
1 stop16h 14m
Deal found 9/8£658
Wed 18/1116:39 -
1 stop11h 41m
Wed 25/1114:45 -
1 stop15h 49m
Deal found 10/8£658
Mon 21/915:21 -
1 stop13h 54m
Tue 6/1008:15 -
2 stops21h 14m
Deal found 6/8£661

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 10 August 2026.

Round-trip from

£634

One-way from

£245

Popular in

January

Cheapest in

April

Average price

£714
Alaska Airlines
  • Alaska Airlines
  • 9/12-12/1
  • 2 total stops
  • 39h 46m total
  • Idaho to London
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 18/11
  • 1 total stop
  • 15h 39m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 33% potential increase in price (£302 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 18% potential price decrease (£98 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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 10 August 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 Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Mon 7/12

06:00-12:20

1 stop23h 20m

London Heathrow

Tue 12/1

14:45-22:20

1 stop14h 35m

£652

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Mon 7/12

07:00-09:40

1 stop19h 40m

London Heathrow

Fri 11/12

06:35-09:28

2 stops33h 53m

£654

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 18/11

11:22-07:55

1 stop12h 33m

London Heathrow

Wed 25/11

13:00-12:29

2 stops31h 29m

£656

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Mon 7/12

06:15-12:20

1 stop23h 05m

London Heathrow

Fri 11/12

14:45-22:39

1 stop14h 54m

£658

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Sun 10/1

07:00-12:20

1 stop21h 20m

London Heathrow

Thu 28/1

14:45-22:57

1 stop16h 12m

£658

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 18/11

13:41-12:20

1 stop14h 39m

London Heathrow

Wed 25/11

14:45-22:34

1 stop15h 49m

£658

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Mon 7/12

11:30-10:00

1 stop15h 30m

London Heathrow

Thu 14/1

06:30-15:30

2 stops16h 00m

£664

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 9/12

07:05-11:35

1 stop21h 30m

London Heathrow

Thu 14/1

06:30-18:33

2 stops19h 03m

£664

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Sun 6/12

06:00-10:40

1 stop21h 40m

London Heathrow

Wed 13/1

06:30-15:30

2 stops16h 00m

£665

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:58-13:45

1 stop16h 47m

London Heathrow

Tue 13/10

08:15-21:42

2 stops20h 27m

£665

Flights are sorted by cheapest return flights first.

Deals found on 10/8

Showing 1-10 of 43 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, November is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £473). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,497). 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?

Airfare is typical for this route at the moment.
Idaho to London Heathrow Airport flights typically cost between £539 and £721 in December.
The cheapest return price found within the last 5 days was £634 on Alaska Airlines (9 Dec–12 Jan).

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 Iberia, Alaska Airlines, and United Airlines fly from Idaho to London Heathrow Airport in about 16h 50m. The time it takes to get you to your destination can typically vary by up to 6h 30m. 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, November is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £473). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,497). 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
Luton
Gatwick
Wembley
Ilford
Slough
Hayes
Croydon
Colchester
Brentford
Eastbourne
Northampton
Watford
Southend-on-Sea
Swindon
Enfield
Kingston upon Thames
Southall
Poole

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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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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