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

Airlines like United Airlines and Iberia fly from Idaho to London Heathrow Airport in about 16h 39m. The time it takes to get you to your destination can typically vary by up to 16h 48m. 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.

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.

£247+ Cheap Flights from Idaho to London Heathrow Airport

Cheap flight deals from Idaho to Heathrow

Enter your travel dates to find the best prices.

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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 19 October 2026.

Tue 17/1106:20 -

1 stop21h 55m

Tue 24/1106:35 -

2 stops21h 40m

Deal found 18/10£703

Tue 1/1206:15 -

2 stops16h 40m

Tue 8/1206:35 -

2 stops21h 55m

Deal found 17/10£707

Tue 17/1106:30 -

2 stops46h 20m

Tue 24/1114:30 -

2 stops38h 02m

Deal found 18/10£707

Mon 23/1113:17 -

2 stops15h 23m

Tue 8/1206:30 -

2 stops17h 46m

Deal found 19/10£713

Mon 23/1114:51 -

1 stop11h 49m

Tue 8/1213:35 -

1 stop16h 24m

Deal found 19/10£719

Sun 6/1208:00 -

2 stops16h 10m

Fri 25/1207:30 -

2 stops21h 13m

Deal found 18/10£720

Mon 23/1113:17 -

2 stops17h 28m

Tue 8/1206:30 -

2 stops19h 08m

Deal found 18/10£721

Mon 23/1106:30 -

3 stops19h 00m

Tue 8/1214:30 -

2 stops27h 38m

Deal found 19/10£725

Find flight deals from Idaho to Heathrow

Round-trip from	£568
One-way from	£247
Popular in	January
Cheapest in	April
Average price	£820

United Airlines
2/3-5/3
4 total stops
53h 38m total
Idaho to London

Search Deals

United Airlines
10/3-31/12
2 total stops
22h 10m total
Idaho to London

Search Deals

Highest demand for flights based on searches. 29% potential increase in price (£280 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 16% potential price decrease (£97 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 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.

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Depart

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Price

Cheapest return flight

Fastest return journey

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Mon 15/3

16:00-12:10

1 stop14h 10m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£247

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

14:00-12:10

1 stop15h 10m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£296

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

10:39-08:30

2 stops38h 51m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£352

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Thu 12/11

05:43-17:50

3 stops29h 07m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£356

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

06:00-06:20

2 stops17h 20m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£378

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Mon 30/11

08:49-10:55

2 stops19h 06m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£437

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Sun 29/11

08:55-10:40

1 stop18h 45m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£437

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Tue 2/3

16:05-11:15

1 stop36h 10m

London Heathrow

Fri 5/3

06:35-19:16

2 stops19h 41m

£615

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Tue 2/3

12:00-12:20

1 stop17h 20m

London Heathrow

Fri 5/3

14:45-00:11

1 stop16h 26m

£659

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 7/4

14:43-09:40

1 stop11h 57m

London Heathrow

Wed 21/4

07:25-19:16

2 stops18h 51m

£659

Flights are sorted by cheapest return flights first.

Deals found on 16/10

Showing 1-10 of 11 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

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

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 £641). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,516). 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 £640 and £943 in March.
The cheapest return price found within the last 5 days was £568 on United Airlines (2 Mar–5 Mar).

Related info for your journey

How long is the flight from Idaho to London Heathrow Airport?
Airlines like United Airlines and Iberia fly from Idaho to London Heathrow Airport in about 16h 39m. The time it takes to get you to your destination can typically vary by up to 16h 48m. 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 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, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £641). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,516). 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 £247

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 19 October 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 19 October 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 19 October 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 19 October 2026.

Last-minute flights from Idaho to HeathrowDiscover last-minute flight deals from Idaho to Heathrow. Data last updated 19 October 2026 and is based on user searches.

Discover last-minute flight deals from Idaho to Heathrow. Data last updated 19 October 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 19 October 2026.

Search for one-way flight options from Idaho to Heathrow. Find affordable one-way fares based on user searches. Data last updated 19 October 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 £640 and £943 in March.The cheapest return price found within the last 5 days was £568 on United Airlines (2 Mar–5 Mar).

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

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Alternative routes for Idaho to Heathrow

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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 19 October 2026.

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

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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 19 October 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 19 October 2026.

Last-minute flights from Idaho to Heathrow
Discover last-minute flight deals from Idaho to Heathrow. Data last updated 19 October 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 19 October 2026.

Idaho to London Heathrow Airport flights typically cost between £640 and £943 in March.
The cheapest return price found within the last 5 days was £568 on United Airlines (2 Mar–5 Mar).