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

Airlines like United Airlines, Delta, and KLM fly from Idaho to London Heathrow Airport in about 15h 38m. The time it takes to get you to your destination can typically vary by up to 1h 02m. There are 4705 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.

£248+ 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 16 September 2026.

Sun 27/915:21 -

1 stop13h 54m

Tue 13/1008:15 -

2 stops21h 14m

Deal found 15/9£526

Tue 27/1007:00 -

1 stop19h 15m

Tue 3/1106:05 -

2 stops23h 37m

Deal found 11/9£537

Wed 28/1014:51 -

1 stop12h 49m

Wed 4/1113:00 -

2 stops29h 31m

Deal found 13/9£546

Wed 28/1013:05 -

2 stops16h 35m

Wed 4/1106:20 -

2 stops22h 50m

Deal found 13/9£548

Mon 21/912:38 -

1 stop14h 42m

Tue 6/1011:45 -

2 stops17h 25m

Deal found 14/9£548

Mon 21/914:11 -

1 stop16h 04m

Tue 6/1008:55 -

2 stops21h 09m

Deal found 14/9£549

Tue 29/908:15 -

1 stop19h 55m

Wed 7/1007:25 -

2 stops19h 04m

Deal found 15/9£551

Sun 27/908:15 -

1 stop16h 10m

Tue 13/1011:25 -

1 stop13h 18m

Deal found 15/9£553

Mon 21/907:02 -

1 stop22h 48m

Tue 6/1008:55 -

1 stop20h 34m

Deal found 14/9£553

Mon 21/917:49 -

1 stop13h 46m

Tue 6/1011:40 -

1 stop15h 05m

Deal found 14/9£553

Mon 28/918:57 -

1 stop33h 03m

Tue 13/1010:55 -

1 stop14h 21m

Deal found 14/9£555

Wed 18/1109:33 -

1 stop17h 07m

Wed 25/1106:30 -

2 stops18h 31m

Deal found 16/9£555

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 16 September 2026.

Sun 27/908:15 -

1 stop16h 10m

Tue 13/1011:25 -

1 stop13h 18m

Deal found 15/9£553

Mon 28/918:57 -

2 stops15h 38m

Tue 13/1020:05 -

2 stops33h 05m

Deal found 14/9£555

Tue 13/1013:00 -

1 stop16h 15m

Tue 20/1006:30 -

2 stops16h 20m

Deal found 13/9£556

Wed 14/1016:24 -

1 stop14h 36m

Wed 21/1011:40 -

1 stop13h 18m

Deal found 15/9£559

Tue 2/308:47 -

1 stop20h 33m

Fri 5/314:45 -

1 stop14h 35m

Deal found 15/9£561

Thu 29/1009:15 -

1 stop18h 25m

Thu 5/1112:20 -

1 stop18h 46m

Deal found 14/9£710

Fri 9/1009:15 -

2 stops17h 15m

Thu 15/1008:40 -

2 stops22h 26m

Deal found 13/9£803

Tue 29/906:25 -

2 stops17h 20m

Wed 7/1007:25 -

2 stops19h 04m

Deal found 15/9£555

Wed 28/1013:25 -

1 stop13h 35m

Tue 3/1111:30 -

2 stops20h 29m

Deal found 11/9£556

Wed 2/1207:25 -

2 stops16h 40m

Mon 7/1217:50 -

2 stops29h 45m

Deal found 15/9£559

Tue 13/1016:24 -

1 stop17h 11m

Tue 20/1011:40 -

1 stop13h 18m

Deal found 14/9£560

Tue 27/1012:42 -

1 stop16h 38m

Tue 3/1114:45 -

1 stop17h 14m

Deal found 12/9£561

Tue 13/1016:24 -

1 stop17h 11m

Tue 20/1006:30 -

2 stops18h 28m

Deal found 14/9£556

Mon 7/1206:00 -

1 stop23h 20m

Wed 9/1214:45 -

1 stop31h 22m

Deal found 13/9£564

Mon 8/214:45 -

1 stop11h 55m

Wed 17/211:35 -

1 stop13h 20m

Deal found 15/9£567

Wed 2/1207:25 -

2 stops16h 40m

Sun 6/1220:25 -

2 stops27h 10m

Deal found 15/9£596

Wed 14/1013:00 -

1 stop18h 35m

Wed 21/1011:45 -

2 stops20h 05m

Deal found 15/9£556

Wed 7/1006:09 -

1 stop25h 56m

Tue 13/1017:00 -

1 stop29h 20m

Deal found 14/9£569

Thu 15/1016:00 -

1 stop15h 55m

Sun 25/1012:20 -

1 stop15h 48m

Deal found 12/9£635

Thu 12/1113:12 -

2 stops15h 28m

Mon 16/1117:05 -

2 stops30h 18m

Deal found 13/9£596

Sun 4/1005:00 -

1 stop21h 40m

Mon 12/1013:05 -

2 stops17h 54m

Deal found 16/9£601

Wed 28/1009:30 -

1 stop18h 10m

Wed 4/1106:30 -

2 stops21h 38m

Deal found 13/9£556

Wed 11/1113:12 -

2 stops15h 28m

Sun 15/1120:25 -

2 stops26h 58m

Deal found 13/9£596

Sat 3/1018:50 -

1 stop33h 20m

Mon 12/1013:05 -

2 stops17h 54m

Deal found 15/9£605

Wed 7/1013:05 -

1 stop13h 55m

Tue 13/1010:55 -

1 stop18h 15m

Deal found 13/9£561

Mon 30/1113:12 -

1 stop13h 48m

Sun 6/1210:45 -

1 stop15h 46m

Deal found 15/9£598

Sun 10/113:56 -

1 stop15h 24m

Mon 18/114:45 -

1 stop15h 08m

Deal found 12/9£665

Mon 12/1019:13 -

1 stop13h 22m

Wed 21/1011:40 -

1 stop13h 53m

Deal found 12/9£561

Thu 18/212:29 -

1 stop12h 26m

Sat 27/206:35 -

2 stops21h 40m

Deal found 13/9£632

Wed 18/1116:25 -

1 stop16h 05m

Wed 25/1112:20 -

1 stop14h 37m

Deal found 13/9£561

Find flight deals from Idaho to Heathrow

Round-trip from	£526
One-way from	£248
Popular in	January
Cheapest in	April
Average price	£710

American Airlines
27/9-13/10
3 total stops
35h 08m total
Idaho to London

Search Deals

Virgin Atlantic
10/3-31/12
2 total stops
18h 10m 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

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

£248

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 10/3

05:00-05:55

2 stops17h 55m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£248

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Sat 13/3

16:00-21:20

2 stops21h 20m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£252

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Sat 13/3

19:44-12:20

1 stop32h 36m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£256

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

14:00-12:20

1 stop15h 20m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£285

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

07:00-08:30

2 stops18h 30m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£292

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Thu 11/3

11:30-11:40

2 stops17h 10m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£342

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Sun 25/10

08:15-11:15

1 stop21h 00m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£343

Fastest return journey

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 28/10

12:00-07:25

1 stop13h 25m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£343

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Sat 7/11

12:31-20:35

2 stops25h 04m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£343

Flights are sorted by cheapest return flights first.

Deals found on 12/9

Showing 1-10 of 46 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.

BOI-LHR

GEG-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

BOI-LHR

GEG-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 £474). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,499). 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 £710 and £896 in September.
The cheapest return price found within the last 5 days was £526 on American Airlines (27 Sept–13 Oct).

Related info for your journey

How long is the flight from Idaho to London Heathrow Airport?
Airlines like United Airlines, Delta, and KLM fly from Idaho to London Heathrow Airport in about 15h 38m. The time it takes to get you to your destination can typically vary by up to 1h 02m. There are 4705 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 £474). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,499). 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.

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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.

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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Cheap flights from Idaho to London Heathrow Airport from £248

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/3. 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 16 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 16 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 16 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 16 September 2026.

Last-minute flights from Idaho to HeathrowDiscover last-minute flight deals from Idaho to Heathrow. Data last updated 16 September 2026 and is based on user searches.

Discover last-minute flight deals from Idaho to Heathrow. Data last updated 16 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 16 September 2026.

Search for one-way flight options from Idaho to Heathrow. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.

Find flight deals from Idaho to Heathrow

Round-trip from

One-way from

Popular in

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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 £710 and £896 in September.The cheapest return price found within the last 5 days was £526 on American Airlines (27 Sept–13 Oct).

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

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Heathrow by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to England

Book a non-stop flight to one of these other cities located in England.

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 16 September 2026.

Idaho and Heathrow flights

Browse other Idaho and Heathrow flight options. Last updated on 16 September 2026.

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How does Cheapflights help users find flights from Idaho to Heathrow?

Why should you use Cheapflights to find cheap flight tickets from Idaho to Heathrow?

Can Cheapflights find flights from Idaho to Heathrow with no change fees?

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 16 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 16 September 2026.

Last-minute flights from Idaho to Heathrow
Discover last-minute flight deals from Idaho to Heathrow. Data last updated 16 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 16 September 2026.

Idaho to London Heathrow Airport flights typically cost between £710 and £896 in September.
The cheapest return price found within the last 5 days was £526 on American Airlines (27 Sept–13 Oct).