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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 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
6 Sep — 13 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 7 August 2026.

Mon 2/1106:30 -
2 stops21h 20m
Wed 4/1106:35 -
2 stops21h 40m
Deal found 3/8£560
Tue 3/1117:44 -
1 stop32h 56m
Fri 6/1106:35 -
2 stops23h 24m
Deal found 2/8£611
Wed 9/1206:00 -
1 stop23h 20m
Tue 12/114:45 -
1 stop16h 26m
Deal found 6/8£635
Wed 18/1106:02 -
1 stop22h 18m
Wed 25/1114:45 -
1 stop25h 21m
Deal found 2/8£643
Tue 3/1106:00 -
1 stop20h 00m
Tue 24/1106:05 -
2 stops22h 40m
Deal found 4/8£649
Sun 1/1105:30 -
1 stop18h 35m
Thu 12/1106:30 -
2 stops16h 03m
Deal found 2/8£651
Wed 18/1116:32 -
1 stop15h 58m
Wed 25/1108:40 -
2 stops19h 15m
Deal found 4/8£651
Tue 3/1109:15 -
1 stop17h 25m
Tue 24/1120:25 -
2 stops34h 38m
Deal found 4/8£652
Wed 18/1107:00 -
2 stops21h 50m
Wed 25/1108:30 -
2 stops20h 41m
Deal found 2/8£652
Tue 3/1116:37 -
1 stop11h 43m
Tue 24/1114:45 -
1 stop28h 47m
Deal found 4/8£653
Sun 1/1117:59 -
2 stops19h 11m
Fri 6/1108:40 -
2 stops18h 56m
Deal found 2/8£654
Sat 31/1013:40 -
1 stop34h 45m
Fri 6/1108:40 -
2 stops18h 56m
Deal found 2/8£654

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 7 August 2026.

Round-trip from

£560

One-way from

£248

Popular in

January

Cheapest in

April

Average price

£691
United Airlines
  • United Airlines
  • 2/11-4/11
  • 4 total stops
  • 43h 00m total
  • Idaho to London
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 2/11
  • 1 total stop
  • 18h 31m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 33% potential increase in price (£304 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 7 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 2/11

06:30-10:50

2 stops21h 20m

London Heathrow

Wed 4/11

06:35-21:15

2 stops21h 40m

£560

LewistonLondon

LWS Lewiston Nez Perce Rgnl - LHR London Heathrow

LWSLHR

Lewiston Nez Perce Rgnl

Tue 3/11

09:15-10:40

1 stop17h 25m

London Heathrow

Tue 24/11

20:25-23:03

2 stops34h 38m

£652

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 9/12

13:00-12:20

1 stop16h 20m

London Heathrow

Wed 13/1

14:45-22:20

1 stop14h 35m

£654

LewistonLondon

LWS Lewiston Nez Perce Rgnl - LHR London Heathrow

LWSLHR

Lewiston Nez Perce Rgnl

Tue 3/11

09:15-13:45

2 stops20h 30m

London Heathrow

Tue 24/11

20:25-23:03

2 stops34h 38m

£655

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

£655

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Mon 16/11

11:22-07:55

1 stop12h 33m

London Heathrow

Wed 18/11

13:00-12:18

2 stops31h 18m

£657

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

£659

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

£667

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Tue 27/10

15:30-10:40

1 stop12h 10m

London Heathrow

Tue 3/11

06:30-20:08

2 stops21h 38m

£672

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Mon 19/10

13:00-15:35

1 stop18h 35m

London Heathrow

Tue 10/11

06:30-17:00

2 stops18h 30m

£672

Flights are sorted by cheapest return flights first.

Deals found on 4/8

Showing 1-10 of 47 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, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £602). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,501). 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 £540 and £763 in November.
The cheapest return price found within the last 5 days was £560 on United Airlines (2 Nov–4 Nov).

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, KLM, and Alaska Airlines fly from Idaho to London Heathrow Airport in about 16h 20m. The time it takes to get you to your destination can typically vary by up to 5h. There are 4829 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 £602). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,501). 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
Gatwick
Luton
Wembley
Slough
Ilford
Hayes
Croydon
Colchester
Eastbourne
Brentford
Northampton
Watford
Swindon
Southend-on-Sea
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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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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