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

Airlines like United Airlines, KLM, and Delta fly from Idaho to London Heathrow Airport in about 13h 48m. The time it takes to get you to your destination can typically vary by up to 7h 12m. 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 25 August 2026.

Wed 2/1214:40 -

2 stops20h 05m

Fri 4/1207:40 -

2 stops20h 33m

Deal found 24/8£548

Wed 2/1212:30 -

1 stop16h 30m

Fri 4/1206:35 -

2 stops21h 38m

Deal found 24/8£550

Sun 6/1206:15 -

2 stops17h 55m

Tue 8/1206:35 -

2 stops19h 41m

Deal found 24/8£553

Sun 6/1210:37 -

2 stops17h 08m

Tue 8/1210:45 -

1 stop14h 08m

Deal found 24/8£599

Mon 7/1207:00 -

1 stop19h 40m

Wed 9/1206:35 -

2 stops41h 47m

Deal found 20/8£604

Sun 6/1212:30 -

2 stops15h 20m

Tue 8/1206:35 -

2 stops21h 38m

Deal found 20/8£634

Wed 9/1211:49 -

1 stop13h 06m

Wed 13/113:45 -

1 stop14h 30m

Deal found 22/8£636

Tue 8/1213:43 -

1 stop14h 57m

Tue 12/106:30 -

2 stops23h 38m

Deal found 22/8£639

Tue 1/1212:19 -

1 stop16h 41m

Tue 8/1207:30 -

2 stops22h 12m

Deal found 25/8£642

Wed 18/1116:32 -

1 stop15h 58m

Wed 25/1108:40 -

2 stops19h 15m

Deal found 21/8£644

Wed 25/1113:12 -

1 stop13h 48m

Wed 2/1217:50 -

2 stops29h 45m

Deal found 23/8£644

Sun 6/1218:45 -

2 stops18h 25m

Thu 14/108:55 -

2 stops18h 22m

Deal found 22/8£644

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 25 August 2026.

Wed 2/1212:30 -

1 stop16h 30m

Fri 4/1206:35 -

2 stops21h 38m

Deal found 24/8£550

Mon 30/1113:12 -

1 stop13h 48m

Mon 7/1220:25 -

2 stops30h 06m

Deal found 23/8£644

Mon 7/1206:00 -

1 stop21h 00m

Tue 12/108:55 -

2 stops16h 38m

Deal found 23/8£644

Sun 6/1209:53 -

1 stop19h 27m

Tue 12/114:45 -

1 stop16h 01m

Deal found 23/8£647

Wed 7/1013:58 -

1 stop16h 47m

Tue 13/1008:15 -

2 stops20h 27m

Deal found 25/8£661

Mon 5/1013:05 -

2 stops19h 30m

Mon 12/1019:45 -

2 stops33h 25m

Deal found 21/8£683

Sun 6/1212:30 -

1 stop12h 25m

Tue 8/1206:35 -

2 stops21h 38m

Deal found 20/8£550

Sun 6/1215:10 -

1 stop14h 10m

Thu 14/114:45 -

1 stop16h 01m

Deal found 23/8£647

Mon 7/1214:40 -

1 stop12h 00m

Wed 9/1206:35 -

2 stops33h 53m

Deal found 21/8£604

Tue 29/915:28 -

1 stop12h 52m

Wed 7/1006:30 -

2 stops17h 44m

Deal found 24/8£666

Tue 8/1209:53 -

1 stop19h 27m

Fri 15/114:45 -

1 stop16h 01m

Deal found 23/8£647

Sun 27/919:06 -

2 stops17h 04m

Tue 17/1108:40 -

2 stops19h 15m

Deal found 21/8£669

Thu 11/217:57 -

2 stops39h 53m

Sun 14/211:35 -

1 stop12h 47m

Deal found 23/8£656

Tue 22/910:34 -

2 stops19h 31m

Tue 29/911:45 -

2 stops17h 49m

Deal found 25/8£669

Mon 14/1209:53 -

1 stop19h 27m

Tue 19/114:45 -

1 stop16h 01m

Deal found 23/8£688

Sat 5/1216:29 -

1 stop34h 11m

Fri 11/1211:10 -

2 stops41h 03m

Deal found 25/8£659

Wed 18/1107:00 -

2 stops17h 35m

Wed 25/1108:40 -

2 stops19h 29m

Deal found 25/8£669

Tue 1/1214:40 -

1 stop12h 00m

Tue 8/1211:35 -

1 stop16h 38m

Deal found 23/8£666

Tue 20/1006:22 -

1 stop19h 53m

Fri 6/1112:20 -

1 stop14h 25m

Deal found 21/8£687

Tue 29/906:25 -

2 stops17h 50m

Wed 7/1007:25 -

2 stops19h 04m

Deal found 21/8£669

Sun 27/912:38 -

1 stop14h 42m

Sun 11/1011:45 -

2 stops20h 05m

Deal found 20/8£702

Wed 7/1014:14 -

1 stop13h 56m

Tue 13/1016:25 -

2 stops38h 34m

Deal found 21/8£673

Sun 4/1012:17 -

1 stop20h 18m

Mon 12/1006:30 -

2 stops19h 03m

Deal found 22/8£702

Sat 3/1016:08 -

2 stops20h 32m

Tue 27/1013:00 -

2 stops30h 29m

Deal found 20/8£675

Thu 8/1013:00 -

1 stop14h 20m

Thu 15/1011:45 -

2 stops17h 25m

Deal found 24/8£702

Wed 21/1005:00 -

2 stops17h 45m

Tue 10/1109:10 -

2 stops20h 01m

Deal found 22/8£691

Fri 9/1009:30 -

2 stops17h 15m

Fri 16/1006:30 -

2 stops17h 44m

Deal found 25/8£709

Tue 1/1207:00 -

1 stop19h 40m

Sun 6/1215:00 -

2 stops37h 08m

Deal found 24/8£691

Tue 15/1212:20 -

1 stop15h 20m

Mon 18/108:55 -

2 stops18h 22m

Deal found 23/8£714

Thu 24/1212:31 -

2 stops25h 04m

Tue 19/106:35 -

2 stops19h 41m

Deal found 21/8£721

Find flight deals from Idaho to Heathrow

Round-trip from	£548
One-way from	£240
Popular in	January
Cheapest in	April
Average price	£812

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

Search Deals

Air France
29/12
1 total stop
16h 40m total
Idaho to London

Search Deals

Highest demand for flights based on searches. 31% potential increase in price (£289 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 17% potential price decrease (£94 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 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

12:30-12:00

1 stop16h 30m

London Heathrow

Fri 4/12

06:35-21:13

2 stops21h 38m

£550

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

06:35-21:13

2 stops21h 38m

£550

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

£604

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Mon 30/11

13:12-10:00

1 stop13h 48m

London Heathrow

Mon 7/12

20:25-19:31

2 stops30h 06m

£644

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Mon 7/12

06:00-10:00

1 stop21h 00m

London Heathrow

Tue 12/1

08:55-18:33

2 stops16h 38m

£644

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Sun 6/12

09:53-12:20

1 stop19h 27m

London Heathrow

Tue 12/1

14:45-23:46

1 stop16h 01m

£647

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Sun 6/12

15:10-12:20

1 stop14h 10m

London Heathrow

Thu 14/1

14:45-23:46

1 stop16h 01m

£647

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Tue 8/12

09:53-12:20

1 stop19h 27m

London Heathrow

Fri 15/1

14:45-23:46

1 stop16h 01m

£647

Idaho FallsLondon

IDA Idaho Falls Fanning Field - LHR London Heathrow

IDALHR

Idaho Falls Fanning Field

Thu 11/2

17:57-16:50

2 stops39h 53m

London Heathrow

Sun 14/2

11:35-17:22

1 stop12h 47m

£656

JacksonLondon

JAC Jackson Hole - LHR London Heathrow

JACLHR

Jackson Hole

Sat 5/12

16:29-09:40

1 stop34h 11m

London Heathrow

Fri 11/12

11:10-21:13

2 stops41h 03m

£659

Flights are sorted by cheapest return flights first.

Deals found on 25/8

Showing 1-10 of 58 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

IDA-LHR

JAC-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

IDA-LHR

JAC-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 £469). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,482). 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 £691 and £819 in December.
The cheapest return price found within the last 5 days was £553 on United Airlines (6 Dec–8 Dec).

Related info for your journey

How long is the flight from Idaho to London Heathrow Airport?
Airlines like United Airlines, KLM, and Delta fly from Idaho to London Heathrow Airport in about 13h 48m. The time it takes to get you to your destination can typically vary by up to 7h 12m. 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 £469). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,482). 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 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 25 August 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 25 August 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 25 August 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 25 August 2026.

Last-minute flights from Idaho to HeathrowDiscover last-minute flight deals from Idaho to Heathrow. Data last updated 25 August 2026 and is based on user searches.

Discover last-minute flight deals from Idaho to Heathrow. Data last updated 25 August 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 25 August 2026.

Search for one-way flight options from Idaho to Heathrow. Find affordable one-way fares based on user searches. Data last updated 25 August 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 £691 and £819 in December.The cheapest return price found within the last 5 days was £553 on United Airlines (6 Dec–8 Dec).

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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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 25 August 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 25 August 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 25 August 2026.

Last-minute flights from Idaho to Heathrow
Discover last-minute flight deals from Idaho to Heathrow. Data last updated 25 August 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 25 August 2026.

Idaho to London Heathrow Airport flights typically cost between £691 and £819 in December.
The cheapest return price found within the last 5 days was £553 on United Airlines (6 Dec–8 Dec).