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

Airlines like United Airlines, Lufthansa, and KLM fly from Idaho to London Heathrow Airport in about 16h 05m. The time it takes to get you to your destination can typically vary by up to 5h. 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.

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.

£241+ 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 3 September 2026.

Wed 2/1214:40 -

2 stops20h 05m

Fri 4/1207:40 -

2 stops20h 33m

Deal found 31/8£553

Wed 2/1212:25 -

1 stop16h 35m

Fri 4/1206:35 -

2 stops21h 38m

Deal found 1/9£556

Mon 7/1214:40 -

1 stop12h 00m

Wed 9/1206:35 -

2 stops33h 53m

Deal found 1/9£611

Wed 2/1214:40 -

2 stops21h 05m

Tue 8/1207:40 -

2 stops20h 33m

Deal found 2/9£645

Wed 2/1214:40 -

1 stop12h 00m

Tue 8/1206:35 -

2 stops21h 38m

Deal found 2/9£651

Sun 6/1209:53 -

1 stop19h 27m

Tue 12/114:45 -

1 stop16h 01m

Deal found 30/8£651

Mon 7/1207:00 -

1 stop19h 40m

Wed 9/1207:30 -

2 stops20h 38m

Deal found 1/9£651

Mon 30/1113:12 -

1 stop13h 48m

Mon 7/1220:25 -

2 stops30h 06m

Deal found 29/8£651

Tue 8/1206:35 -

1 stop21h 05m

Tue 12/106:30 -

2 stops19h 03m

Deal found 30/8£651

Mon 7/1207:00 -

1 stop21h 20m

Fri 18/1214:45 -

1 stop16h 21m

Deal found 31/8£652

Wed 2/1213:21 -

1 stop15h 39m

Mon 7/1219:40 -

2 stops23h 59m

Deal found 1/9£653

Wed 2/1207:25 -

2 stops16h 40m

Mon 7/1217:50 -

2 stops29h 45m

Deal found 1/9£654

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 3 September 2026.

Wed 2/1212:25 -

1 stop16h 35m

Fri 4/1206:35 -

2 stops21h 38m

Deal found 1/9£556

Wed 2/1214:40 -

2 stops21h 05m

Tue 8/1207:40 -

2 stops20h 33m

Deal found 2/9£645

Wed 2/1213:06 -

2 stops17h 39m

Mon 7/1220:25 -

2 stops27h 10m

Deal found 29/8£654

Mon 7/1206:15 -

1 stop23h 05m

Wed 9/1214:45 -

1 stop14h 54m

Deal found 1/9£659

Wed 14/1015:30 -

1 stop16h 05m

Wed 21/1006:30 -

2 stops16h 20m

Deal found 30/8£665

Wed 18/1116:25 -

1 stop16h 05m

Wed 25/1108:40 -

2 stops19h 29m

Deal found 2/9£672

Tue 29/913:15 -

1 stop14h 45m

Tue 6/1010:55 -

1 stop15h 31m

Deal found 31/8£691

Mon 7/1214:40 -

1 stop12h 00m

Wed 9/1206:35 -

2 stops33h 53m

Deal found 1/9£611

Sun 18/1013:00 -

1 stop18h 35m

Thu 29/1006:30 -

2 stops21h 40m

Deal found 31/8£673

Wed 2/1207:00 -

2 stops17h 10m

Tue 8/1215:00 -

3 stops27h 23m

Deal found 2/9£681

Wed 4/1113:05 -

1 stop13h 55m

Mon 9/1115:45 -

2 stops31h 38m

Deal found 2/9£694

Fri 23/1009:53 -

1 stop16h 07m

Fri 30/1006:30 -

2 stops19h 15m

Deal found 1/9£709

Sat 14/1112:49 -

1 stop16h 31m

Fri 20/1114:45 -

1 stop34h 41m

Deal found 31/8£742

Mon 19/1012:20 -

2 stops15h 05m

Thu 29/1006:35 -

2 stops20h 22m

Deal found 30/8£676

Wed 14/1009:30 -

2 stops16h 50m

Wed 21/1008:40 -

2 stops19h 28m

Deal found 31/8£676

Wed 18/1106:00 -

1 stop20h 00m

Wed 25/1110:55 -

1 stop20h 45m

Deal found 1/9£694

Tue 29/913:05 -

2 stops19h 30m

Fri 9/1013:25 -

2 stops39h 45m

Deal found 30/8£705

Tue 29/914:28 -

1 stop12h 12m

Tue 6/1014:05 -

2 stops34h 11m

Deal found 31/8£679

Sun 8/1107:40 -

2 stops21h 00m

Fri 20/1106:20 -

2 stops17h 03m

Deal found 1/9£680

Sat 3/1015:28 -

1 stop17h 07m

Mon 12/1009:55 -

1 stop20h 09m

Deal found 1/9£768

Fri 4/1215:10 -

1 stop14h 10m

Sat 9/114:45 -

1 stop14h 37m

Deal found 30/8£773

Tue 29/914:48 -

1 stop11h 52m

Tue 6/1014:05 -

3 stops34h 44m

Deal found 31/8£679

Sun 6/1213:47 -

1 stop14h 53m

Thu 7/106:30 -

2 stops16h 30m

Deal found 30/8£683

Sun 8/1110:35 -

1 stop16h 05m

Fri 20/1107:30 -

2 stops20h 39m

Deal found 1/9£680

Tue 22/912:14 -

2 stops16h 51m

Sun 27/911:40 -

1 stop19h 28m

Deal found 1/9£824

Sun 6/1213:47 -

1 stop14h 53m

Fri 8/106:30 -

2 stops24h 25m

Deal found 30/8£683

Sat 3/1013:05 -

1 stop34h 20m

Tue 27/1013:00 -

2 stops30h 29m

Deal found 30/8£683

Tue 9/213:15 -

1 stop13h 45m

Sun 14/306:30 -

2 stops19h 47m

Deal found 29/8£695

Wed 7/1006:25 -

2 stops17h 20m

Tue 13/1007:25 -

2 stops19h 04m

Deal found 1/9£698

Sun 25/1015:30 -

1 stop12h 10m

Mon 2/1106:30 -

2 stops16h 20m

Deal found 29/8£710

Find flight deals from Idaho to Heathrow

Round-trip from	£553
One-way from	£241
Popular in	January
Cheapest in	April
Average price	£709

Lufthansa
2/12-4/12
4 total stops
40h 38m total
Idaho to London

Search Deals

Virgin Atlantic
29/12
1 total stop
20h 35m total
Idaho to London

Search Deals

Highest demand for flights based on searches. 31% potential increase in price (£294 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 17% potential price decrease (£97 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

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Wed 2/12

12:25-12:00

1 stop16h 35m

London Heathrow

Fri 4/12

06:35-21:13

2 stops21h 38m

£556

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Mon 7/12

14:40-09:40

1 stop12h 00m

London Heathrow

Wed 9/12

06:35-09:28

2 stops33h 53m

£611

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Wed 2/12

14:40-18:45

2 stops21h 05m

London Heathrow

Tue 8/12

07:40-21:13

2 stops20h 33m

£645

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Wed 2/12

13:06-13:45

2 stops17h 39m

London Heathrow

Mon 7/12

20:25-16:35

2 stops27h 10m

£654

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

Wed 9/12

14:45-22:39

1 stop14h 54m

£659

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 14/10

15:30-15:35

1 stop16h 05m

London Heathrow

Wed 21/10

06:30-14:50

2 stops16h 20m

£665

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 18/11

16:25-16:30

1 stop16h 05m

London Heathrow

Wed 25/11

08:40-20:09

2 stops19h 29m

£672

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Sun 18/10

13:00-15:35

1 stop18h 35m

London Heathrow

Thu 29/10

06:30-21:10

2 stops21h 40m

£673

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Mon 19/10

12:20-10:25

2 stops15h 05m

London Heathrow

Thu 29/10

06:35-20:57

2 stops20h 22m

£676

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Wed 14/10

09:30-10:20

2 stops16h 50m

London Heathrow

Wed 21/10

08:40-20:08

2 stops19h 28m

£676

Flights are sorted by cheapest return flights first.

Deals found on 1/9

Showing 1-10 of 48 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

LWS-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 £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 below average for this route at the moment.

Idaho to London Heathrow Airport flights typically cost between £709 and £895 in December.
The cheapest return price found within the last 5 days was £651 on Alaska Airlines (6 Dec–12 Jan).

Related info for your journey

How long is the flight from Idaho to London Heathrow Airport?
Airlines like United Airlines, Lufthansa, and KLM fly from Idaho to London Heathrow Airport in about 16h 05m. The time it takes to get you to your destination can typically vary by up to 5h. 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 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 £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

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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!

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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 £241

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 29/12. 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 3 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 3 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 3 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 3 September 2026.

Last-minute flights from Idaho to HeathrowDiscover last-minute flight deals from Idaho to Heathrow. Data last updated 3 September 2026 and is based on user searches.

Discover last-minute flight deals from Idaho to Heathrow. Data last updated 3 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 3 September 2026.

Search for one-way flight options from Idaho to Heathrow. Find affordable one-way fares based on user searches. Data last updated 3 September 2026.

Find flight deals from Idaho to Heathrow

Round-trip from

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Cheapflights Fare Finder

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 £709 and £895 in December.The cheapest return price found within the last 5 days was £651 on Alaska Airlines (6 Dec–12 Jan).

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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Direct flights to England

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Search flights from Idaho to Heathrow by cabin class

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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 3 September 2026.

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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 3 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 3 September 2026.

Last-minute flights from Idaho to Heathrow
Discover last-minute flight deals from Idaho to Heathrow. Data last updated 3 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 3 September 2026.

Idaho to London Heathrow Airport flights typically cost between £709 and £895 in December.
The cheapest return price found within the last 5 days was £651 on Alaska Airlines (6 Dec–12 Jan).