How long is the flight from Idaho to London Heathrow Airport?

Airlines like KLM, United Airlines, and Alaska Airlines fly from Idaho to London Heathrow Airport in about 16h 40m. The time it takes to get you to your destination can typically vary by up to 6h 25m. 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.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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.

What is the cheapest time of day to fly from ID to LHR?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to London Heathrow Airport as you normally would.

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.

£240+ Cheap Flights from Idaho to London Heathrow Airport

Cheap flight deals from Idaho to Heathrow

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 12 September 2026.

Tue 27/1007:00 -

1 stop19h 15m

Tue 3/1106:05 -

2 stops23h 37m

Deal found 11/9£535

Mon 2/1105:00 -

1 stop23h 20m

Wed 11/1114:45 -

1 stop31h 37m

Deal found 10/9£548

Tue 29/905:00 -

1 stop21h 40m

Wed 7/1007:25 -

2 stops23h 34m

Deal found 9/9£549

Wed 30/905:00 -

2 stops18h 30m

Wed 7/1007:25 -

2 stops19h 04m

Deal found 10/9£552

Wed 7/1016:00 -

1 stop16h 00m

Tue 13/1006:30 -

2 stops19h 03m

Deal found 12/9£554

Wed 23/905:24 -

1 stop20h 36m

Wed 14/1008:55 -

2 stops20h 15m

Deal found 11/9£554

Sun 6/1209:53 -

1 stop19h 27m

Tue 8/1214:45 -

1 stop15h 02m

Deal found 10/9£555

Wed 2/1207:25 -

2 stops16h 40m

Mon 7/1217:50 -

2 stops29h 45m

Deal found 12/9£557

Mon 12/1005:30 -

2 stops18h 40m

Wed 21/1009:55 -

2 stops19h 13m

Deal found 12/9£557

Wed 7/1006:25 -

1 stop20h 15m

Tue 13/1016:25 -

2 stops38h 34m

Deal found 11/9£557

Mon 12/1007:00 -

2 stops16h 10m

Thu 29/1006:20 -

2 stops16h 54m

Deal found 11/9£557

Mon 7/1206:15 -

1 stop23h 05m

Wed 9/1214:45 -

1 stop14h 54m

Deal found 10/9£559

Best flights from Idaho to Heathrow
Discover carefully curated flight deals from Idaho to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 September 2026.

Wed 2/1207:25 -

2 stops16h 40m

Mon 7/1217:50 -

2 stops29h 45m

Deal found 12/9£557

Wed 7/1006:25 -

1 stop20h 15m

Tue 13/1016:25 -

2 stops38h 34m

Deal found 11/9£557

Mon 7/1206:15 -

1 stop23h 05m

Wed 9/1214:45 -

1 stop14h 54m

Deal found 11/9£559

Wed 7/1015:36 -

1 stop12h 44m

Tue 13/1010:55 -

1 stop20h 04m

Deal found 12/9£559

Mon 30/1113:12 -

1 stop13h 48m

Fri 11/1206:20 -

2 stops17h 15m

Deal found 9/9£583

Wed 4/1113:00 -

1 stop14h 40m

Mon 23/1106:20 -

2 stops17h 48m

Deal found 11/9£591

Tue 2/308:47 -

1 stop20h 33m

Fri 5/314:45 -

1 stop14h 35m

Deal found 12/9£559

Wed 18/1116:25 -

1 stop16h 05m

Wed 25/1112:20 -

1 stop14h 37m

Deal found 12/9£559

Tue 29/906:25 -

2 stops17h 50m

Wed 7/1012:00 -

2 stops28h 34m

Deal found 10/9£563

Sun 10/106:00 -

2 stops18h 05m

Mon 18/120:25 -

2 stops28h 49m

Deal found 9/9£615

Wed 18/1107:23 -

1 stop20h 57m

Wed 25/1114:45 -

1 stop29h 01m

Deal found 11/9£563

Tue 2/313:45 -

2 stops34h 45m

Fri 5/306:35 -

2 stops25h 03m

Deal found 9/9£567

Wed 7/1006:09 -

1 stop17h 36m

Tue 13/1008:15 -

2 stops20h 27m

Deal found 12/9£628

Mon 12/1013:00 -

1 stop16h 15m

Thu 22/1006:30 -

2 stops17h 44m

Deal found 8/9£583

Wed 7/1006:09 -

1 stop25h 56m

Tue 13/1017:00 -

1 stop29h 20m

Deal found 10/9£574

Fri 4/1214:48 -

1 stop11h 52m

Thu 10/1211:35 -

1 stop29h 11m

Deal found 10/9£590

Wed 4/1113:00 -

1 stop14h 40m

Sun 22/1106:20 -

2 stops17h 48m

Deal found 11/9£591

Wed 2/1213:21 -

1 stop15h 54m

Mon 7/1215:40 -

2 stops27h 59m

Deal found 9/9£694

Mon 8/213:15 -

2 stops15h 25m

Wed 17/206:30 -

2 stops24h 25m

Deal found 9/9£593

Mon 7/1214:40 -

1 stop12h 00m

Wed 9/1206:35 -

2 stops33h 53m

Deal found 7/9£609

Fri 23/1006:03 -

1 stop25h 02m

Fri 30/1014:45 -

1 stop30h 55m

Deal found 9/9£611

Wed 13/106:00 -

2 stops17h 25m

Wed 10/308:55 -

2 stops18h 22m

Deal found 8/9£593

Wed 30/914:44 -

1 stop11h 56m

Sat 10/1011:25 -

1 stop17h 10m

Deal found 10/9£611

Sun 4/1006:45 -

1 stop21h 35m

Mon 12/1014:30 -

1 stop15h 34m

Deal found 12/9£596

Sun 10/113:56 -

1 stop15h 24m

Mon 18/114:45 -

1 stop15h 08m

Deal found 12/9£662

Tue 2/318:55 -

1 stop29h 30m

Fri 5/306:35 -

2 stops19h 41m

Deal found 12/9£616

Sun 27/906:22 -

2 stops16h 48m

Sun 11/1018:30 -

1 stop13h 20m

Deal found 11/9£599

Wed 7/1014:28 -

1 stop12h 12m

Tue 13/1014:05 -

2 stops30h 19m

Deal found 11/9£648

Tue 1/1217:32 -

2 stops29h 53m

Sun 6/1210:45 -

1 stop12h 50m

Deal found 11/9£607

Wed 2/1212:25 -

1 stop12h 30m

Mon 7/1211:35 -

1 stop16h 38m

Deal found 12/9£662

Find flight deals from Idaho to Heathrow

Round-trip from	£535
One-way from	£240
Popular in	January
Cheapest in	April
Average price	£707

Iberia
27/10-3/11
3 total stops
42h 52m total
Idaho to London

Search Deals

Iberia
3/3-31/12
1 total stop
16h 50m total
Idaho to London

Search Deals

Highest demand for flights based on searches. 31% potential increase in price (£293 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 17% potential price decrease (£96 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Cheapflights Fare Finder

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

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Mon 28/12

22:43-06:25

1 stop23h 42m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£243

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 30/12

05:00-07:55

2 stops18h 55m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£244

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Tue 29/12

05:00-05:55

2 stops16h 55m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£244

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Mon 28/12

23:42-06:40

2 stops22h 58m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£244

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 10/3

08:40-10:40

1 stop19h 00m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£247

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Tue 29/12

06:00-07:05

2 stops17h 05m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£247

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Sun 7/3

12:40-11:40

1 stop15h 00m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£247

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Sun 7/3

07:02-07:25

1 stop16h 23m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£247

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 10/3

10:05-10:00

1 stop15h 55m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£247

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Thu 4/3

05:40-07:05

1 stop18h 25m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£280

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

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.

GEG-LHR

BOI-LHR

JAC-LHR

IDA-LHR

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

USID-LHR

GEG-LHR

BOI-LHR

JAC-LHR

IDA-LHR

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 £1,494). 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 £707 and £893 in October.
The cheapest return price found within the last 5 days was £535 on Iberia (27 Oct–3 Nov).

Related info for your journey

How long is the flight from Idaho to London Heathrow Airport?
Airlines like KLM, United Airlines, and Alaska Airlines fly from Idaho to London Heathrow Airport in about 16h 40m. The time it takes to get you to your destination can typically vary by up to 6h 25m. 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 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, 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 £1,494). 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

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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.

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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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Cheap flights from Idaho to London Heathrow Airport from £240

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/3. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Idaho to Heathrow

Cheapest flights from Idaho to HeathrowExplore 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 12 September 2026.

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 12 September 2026.

Best flights from Idaho to HeathrowDiscover carefully curated flight deals from Idaho to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 September 2026.

Discover carefully curated flight deals from Idaho to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 September 2026.

Last-minute flights from Idaho to HeathrowDiscover last-minute flight deals from Idaho to Heathrow. Data last updated 12 September 2026 and is based on user searches.

Discover last-minute flight deals from Idaho to Heathrow. Data last updated 12 September 2026 and is based on user searches.

One-way flights from Idaho to HeathrowSearch for one-way flight options from Idaho to Heathrow. Find affordable one-way fares based on user searches. Data last updated 12 September 2026.

Search for one-way flight options from Idaho to Heathrow. Find affordable one-way fares based on user searches. Data last updated 12 September 2026.

Find flight deals from Idaho to Heathrow

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Use the filters below to find and compare flights from Idaho to London Heathrow Airport that are best for you.

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.

Cheapflights Insights

What is the cheapest month to book a flight from Idaho to London Heathrow Airport?

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 £707 and £893 in October.The cheapest return price found within the last 5 days was £535 on Iberia (27 Oct–3 Nov).

Related info for your journey

How long is the flight from Idaho to London Heathrow Airport?

What are the most popular routes from Idaho to London Heathrow Airport?

Can I find deals for flights from Idaho to Heathrow that include hotel bookings?

How can I find direct flights from Idaho to Heathrow?

Can I find deals for business class flights from Idaho to Heathrow?

What is the cheapest month to book a flight from Idaho to London Heathrow Airport?

Travelling to a place near London Heathrow Airport?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho to Heathrow

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Complete your trip

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Other flights to Heathrow

Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 12 September 2026.

Idaho and Heathrow flights

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Can Cheapflights notify me if prices for flights from Idaho to Heathrow become cheaper?

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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 12 September 2026.

Best flights from Idaho to Heathrow
Discover carefully curated flight deals from Idaho to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 September 2026.

Last-minute flights from Idaho to Heathrow
Discover last-minute flight deals from Idaho to Heathrow. Data last updated 12 September 2026 and is based on user searches.

One-way flights from Idaho to Heathrow
Search for one-way flight options from Idaho to Heathrow. Find affordable one-way fares based on user searches. Data last updated 12 September 2026.

Idaho to London Heathrow Airport flights typically cost between £707 and £893 in October.
The cheapest return price found within the last 5 days was £535 on Iberia (27 Oct–3 Nov).