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Cheap flights from Idaho to London Heathrow Airport from £243

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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
15 Sep — 22 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 16 August 2026.

Sun 6/1212:30 -
1 stop12h 25m
Tue 8/1206:35 -
2 stops21h 27m
Deal found 13/8£553
Sun 6/1207:00 -
2 stops17h 10m
Tue 8/1206:35 -
2 stops19h 41m
Deal found 14/8£556
Tue 1/1212:30 -
1 stop16h 30m
Thu 3/1207:30 -
2 stops20h 32m
Deal found 13/8£561
Mon 7/1209:40 -
2 stops15h 45m
Wed 9/1207:30 -
2 stops20h 45m
Deal found 12/8£564
Sun 6/1211:30 -
2 stops16h 15m
Tue 8/1210:45 -
1 stop20h 19m
Deal found 15/8£602
Tue 1/1214:35 -
1 stop12h 05m
Thu 3/1206:35 -
2 stops17h 47m
Deal found 13/8£604
Sun 6/1210:45 -
1 stop15h 55m
Tue 8/1206:35 -
2 stops33h 53m
Deal found 12/8£608
Tue 1/1216:25 -
1 stop34h 15m
Fri 4/1206:35 -
2 stops21h 27m
Deal found 13/8£608
Wed 2/1214:35 -
1 stop12h 05m
Fri 4/1207:30 -
2 stops20h 38m
Deal found 13/8£612
Tue 1/1217:57 -
1 stop32h 43m
Fri 4/1207:30 -
2 stops16h 52m
Deal found 13/8£615
Mon 30/1116:10 -
1 stop34h 30m
Thu 3/1207:30 -
2 stops20h 32m
Deal found 13/8£615
Sun 6/1217:22 -
1 stop33h 18m
Wed 9/1207:30 -
2 stops20h 46m
Deal found 12/8£615

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 16 August 2026.

Round-trip from

£553

One-way from

£243

Popular in

January

Cheapest in

April

Average price

£818
United Airlines
  • United Airlines
  • 6/12-8/12
  • 3 total stops
  • 33h 52m total
  • Idaho to London
Search Deals
5/12
  • 5/12
  • 3 total stops
  • 29h 53m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 31% potential increase in price (£291 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 17% potential price decrease (£95 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 16 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

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Sun 6/12

12:30-07:55

1 stop12h 25m

London Heathrow

Tue 8/12

06:35-21:02

2 stops21h 27m

£553

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Sun 6/12

10:45-09:40

1 stop15h 55m

London Heathrow

Tue 8/12

06:35-09:28

2 stops33h 53m

£608

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Tue 1/12

17:57-09:40

1 stop32h 43m

London Heathrow

Fri 4/12

07:30-17:22

2 stops16h 52m

£615

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 18/11

07:00-08:35

2 stops17h 35m

London Heathrow

Wed 25/11

08:40-19:55

2 stops19h 15m

£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

£652

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

£656

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Sun 6/12

16:03-12:20

1 stop13h 17m

London Heathrow

Tue 8/12

14:45-22:39

1 stop14h 54m

£656

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Mon 30/11

06:00-13:45

2 stops24h 45m

London Heathrow

Fri 4/12

06:20-18:16

2 stops18h 56m

£657

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Sat 5/12

16:25-09:40

1 stop34h 15m

London Heathrow

Fri 11/12

15:00-21:02

2 stops37h 02m

£663

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Mon 16/11

07:00-11:20

2 stops20h 20m

London Heathrow

Wed 18/11

15:00-12:29

2 stops29h 29m

£664

Flights are sorted by cheapest return flights first.

Deals found on 11/8

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, November is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £472). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,493). 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 below average for this route at the moment.
Idaho to London Heathrow Airport flights typically cost between £685 and £759 in December.
The cheapest return price found within the last 5 days was £556 on United Airlines (6 Dec–8 Dec).

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 and Delta fly from Idaho to London Heathrow Airport in about 12h 25m. The time it takes to get you to your destination can typically vary by up to 5h 10m. There are 4658 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, November is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £472). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,493). 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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Los Angeles to Stansted flights
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Los Angeles to London City flights
Boston to Stansted flights
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O'Hare Intl to Gatwick flights
San Francisco to Gatwick flights
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O'Hare Intl to Stansted flights
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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