What are the cheapest airlines to fly from Idaho to London Heathrow Airport one-way?

One-way options have recently been found by users for as low as £313 on Finnair. Other airlines that offer cheap prices include Delta from £343 and KLM from £343 one-way.

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 Idaho Falls Fanning Field - London Heathrow.

How far in advance should I book a flight from Idaho to London Heathrow Airport?

To save on the cost of your flight from Idaho to London Heathrow Airport, book at least 36 days before your planned departure. Booking around this time can save you about 27% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £538 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £644.

What is the cheapest month to fly from Idaho to London Heathrow Airport?

October is one of the best times of the year to fly to London Heathrow Airport from Idaho. Prices for October average £675 per person but you can even find prices for as low as £448. The most expensive prices can be found in the month of June. Opting for a October flight can save you 48% on your journey compared to booking in June

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+ Flights from Idaho to London Heathrow Airport

Cheap flight deals from Idaho to Heathrow

Round-trip from	£504
One-way from	£248
Popular in	June
Cheapest in	October
Average price	£713

United Airlines
8/10-15/10
4 total stops
38h 59m total
Idaho to London

Search Deals

23/9
3 total stops
22h 20m total
Idaho to London

Search Deals

Highest demand for flights based on searches. 22% potential increase in price (£143 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£23 potential savings vs. average return price).

Search Deals

Average for round-trip flights in May 2025

Search Deals

Find flight deals from Idaho to Heathrow

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 29 May 2025.

Tue 7/1005:15GEG - LHR

2 stops20h 20mUnited Airlines

Tue 28/1008:55LHR - GEG

2 stops19h 29mUnited Airlines

Deal found 27/5£506

Wed 3/909:00BOI - LHR

1 stop19h 20mDelta

Tue 16/906:15LHR - BOI

2 stops17h 14mDelta

Deal found 28/5£513

Tue 28/1012:40GEG - LHR

1 stop16h 00mDelta

Thu 6/1106:20LHR - GEG

2 stops16h 24mDelta

Deal found 28/5£513

Wed 3/916:18BOI - LHR

1 stop14h 57mKLM

Tue 16/910:55LHR - BOI

1 stop18h 09mKLM

Deal found 28/5£520

Tue 7/1014:05GEG - LHR

1 stop15h 05mKLM

Tue 28/1012:20LHR - GEG

1 stop13h 27mKLM

Deal found 27/5£520

Wed 24/913:00GEG - LHR

2 stops36h 20mScandinavian Airlines

Wed 8/1006:40LHR - GEG

2 stops18h 17mScandinavian Airlines

Deal found 28/5£526

Wed 3/910:40BOI - LHR

3 stops18h 10mAir Canada

Tue 16/908:30LHR - BOI

3 stops19h 44mAir Canada

Deal found 28/5£533

Tue 19/816:00IDA - LHR

1 stop13h 20mUnited Airlines

Tue 26/806:30LHR - IDA

2 stops17h 53mUnited Airlines

Deal found 28/5£538

Wed 3/907:00BOI - LHR

2 stops16h 30mUnited Airlines

Fri 12/908:30LHR - BOI

2 stops19h 44mUnited Airlines

Deal found 28/5£538

Tue 12/805:15GEG - LHR

2 stops44h 45mMultiple Airlines

Fri 22/806:55LHR - GEG

2 stops22h 08mMultiple Airlines

Deal found 28/5£539

Wed 3/910:28BOI - LHR

2 stops39h 52mScandinavian Airlines

Wed 10/906:40LHR - BOI

2 stops18h 51mScandinavian Airlines

Deal found 28/5£549

Fri 12/905:15GEG - LHR

2 stops17h 20mAir Canada

Fri 26/917:40LHR - GEG

2 stops26h 56mAir Canada

Deal found 28/5£587

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 29 May 2025.

Wed 8/1007:00IDA - LHR

2 stops17h 40mUnited Airlines

Wed 15/1008:30LHR - IDA

2 stops21h 19mUnited Airlines

Deal found 27/5£504

Wed 3/909:00BOI - LHR

1 stop19h 20mDelta

Tue 16/906:15LHR - BOI

2 stops17h 14mDelta

Deal found 28/5£513

Wed 8/1012:46IDA - LHR

1 stop16h 29mMultiple Airlines

Wed 15/1016:30LHR - IDA

1 stop13h 08mMultiple Airlines

Deal found 27/5£520

Wed 3/916:18BOI - LHR

1 stop14h 57mKLM

Tue 16/910:55LHR - BOI

1 stop18h 09mKLM

Deal found 28/5£520

Wed 8/1012:46IDA - LHR

1 stop16h 29mAmerican Airlines

Wed 15/1008:55LHR - IDA

2 stops19h 16mAmerican Airlines

Deal found 27/5£523

Wed 24/913:00GEG - LHR

2 stops36h 20mScandinavian Airlines

Wed 8/1006:40LHR - GEG

2 stops18h 17mScandinavian Airlines

Deal found 28/5£526

Wed 3/910:40BOI - LHR

3 stops18h 10mAir Canada

Tue 16/908:30LHR - BOI

3 stops19h 44mAir Canada

Deal found 28/5£533

Fri 8/813:37GEG - LHR

1 stop12h 03mLufthansa

Mon 18/820:25LHR - GEG

2 stops32h 38mLufthansa

Deal found 27/5£587

Sun 14/906:59BOI - LHR

1 stop22h 31mFinnair

Sat 27/910:30LHR - BOI

1 stop18h 15mFinnair

Deal found 28/5£590

Wed 17/913:43BOI - LHR

1 stop14h 07mIberia

Fri 3/1008:20LHR - BOI

1 stop20h 25mIberia

Deal found 28/5£607

Mon 21/715:04IDA - LHR

2 stops16h 11mVirgin Atlantic

Wed 6/816:05LHR - IDA

2 stops37h 24mVirgin Atlantic

Deal found 28/5£745

Wed 16/720:48GEG - LHR

2 stops31h 07mIcelandair

Sun 3/821:25LHR - GEG

2 stops31h 44mIcelandair

Deal found 28/5£837

Last-minute flights from Idaho to Heathrow
Discover last-minute flight deals from Idaho to Heathrow. Data last updated 29 May 2025 and is based on user searches.

Sun 1/612:27GEG - LHR

2 stops15h 28mIcelandair

Tue 10/621:25LHR - GEG

2 stops33h 42mIcelandair

Deal found 28/5£852

Mon 2/612:27GEG - LHR

2 stops23h 53mIcelandair

Thu 12/621:25LHR - GEG

2 stops25h 15mIcelandair

Deal found 28/5£855

Mon 2/609:05GEG - LHR

2 stops28h 35mScandinavian Airlines

Sun 8/617:00LHR - GEG

2 stops33h 50mScandinavian Airlines

Deal found 28/5£856

Tue 3/620:41BOI - LHR

2 stops16h 39mIcelandair

Sun 8/621:25LHR - BOI

2 stops25h 30mIcelandair

Deal found 28/5£1,151

Tue 3/611:26BOI - LHR

2 stops17h 29mMultiple Airlines

Sun 8/614:20LHR - BOI

1 stop31h 24mMultiple Airlines

Deal found 28/5£1,202

Wed 4/613:50BOI - LHR

2 stops21h 40mScandinavian Airlines

Tue 17/619:30LHR - BOI

2 stops32h 05mScandinavian Airlines

Deal found 28/5£1,038

Wed 4/616:16GEG - LHR

2 stops31h 44mMultiple Airlines

Thu 12/609:50LHR - GEG

1 stop15h 23mMultiple Airlines

Deal found 28/5£1,110

Wed 4/617:43BOI - LHR

1 stop11h 37mUnited Airlines

Tue 17/615:50LHR - BOI

2 stops26h 53mUnited Airlines

Deal found 28/5£1,143

Wed 4/613:00GEG - LHR

1 stop12h 50mDelta

Wed 11/611:30LHR - GEG

2 stops20h 36mDelta

Deal found 28/5£1,148

Wed 4/613:50BOI - LHR

1 stop17h 25mKLM

Tue 17/610:55LHR - BOI

1 stop18h 07mKLM

Deal found 28/5£1,155

Wed 4/607:25GEG - LHR

1 stop16h 00mUnited Airlines

Thu 12/614:50LHR - GEG

1 stop13h 58mUnited Airlines

Deal found 28/5£1,155

Thu 5/607:05IDA - LHR

1 stop22h 15mUnited Airlines

Wed 18/607:30LHR - IDA

2 stops33h 14mUnited Airlines

Deal found 27/5£992

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 29 May 2025.

Tue 23/906:35BOI - LHR

3 stops22h 20mMultiple Airlines

Deal found 28/5£248

Tue 23/906:59BOI - LHR

1 stop20h 51mFinnair

Deal found 28/5£313

Tue 22/707:30JAC - LHR

3 stops20h 40mDelta

Deal found 28/5£343

Mon 21/716:20BOI - LHR

1 stop14h 55mKLM

Deal found 28/5£343

Mon 21/719:15BOI - LHR

3 stops28h 20mUnited Airlines

Deal found 28/5£349

Sat 26/716:07JAC - LHR

1 stop34h 33mUnited Airlines

Deal found 28/5£352

Fri 12/909:10GEG - LHR

2 stops17h 05mDelta

Deal found 28/5£381

Wed 2/717:42BOI - LHR

2 stops57h 18mAir Canada

Deal found 27/5£476

Thu 24/713:02JAC - LHR

3 stops23h 18mMultiple Airlines

Deal found 28/5£546

Tue 1/715:36GEG - LHR

1 stop14h 39mKLM

Deal found 28/5£618

Sat 5/718:49GEG - LHR

2 stops59h 26mMultiple Airlines

Deal found 28/5£682

Fri 19/908:10BOI - LHR

1 stop24h 55mBritish Airways

Deal found 28/5£2,265

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

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 8/10

07:00-07:40

2 stops17h 40m

London Heathrow

Wed 15/10

08:30-22:49

2 stops21h 19m

£504

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 7/10

05:15-09:35

2 stops20h 20m

London Heathrow

Tue 28/10

08:55-21:24

2 stops19h 29m

£506

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 3/9

09:00-11:20

1 stop19h 20m

London Heathrow

Tue 16/9

06:15-16:29

2 stops17h 14m

£513

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 28/10

12:40-11:40

1 stop16h 00m

London Heathrow

Thu 6/11

06:20-14:44

2 stops16h 24m

£513

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 8/10

12:46-12:15

1 stop16h 29m

London Heathrow

Wed 15/10

16:30-22:38

1 stop13h 08m

£520

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 3/9

16:18-14:15

1 stop14h 57m

London Heathrow

Tue 16/9

10:55-22:04

1 stop18h 09m

£520

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 7/10

14:05-13:10

1 stop15h 05m

London Heathrow

Tue 28/10

12:20-18:47

1 stop13h 27m

£520

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 8/10

12:46-12:15

1 stop16h 29m

London Heathrow

Wed 15/10

08:55-21:11

2 stops19h 16m

£523

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 24/9

13:00-09:20

2 stops36h 20m

London Heathrow

Wed 8/10

06:40-16:57

2 stops18h 17m

£526

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 3/9

10:40-11:50

3 stops18h 10m

London Heathrow

Tue 16/9

08:30-21:14

3 stops19h 44m

£533

Flights are sorted by cheapest return flights first.

Deals found on 28/5

Showing 1-10 of 44 results

...

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.

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

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

Currently, January is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £112). Flying from Idaho to London Heathrow Airport in August is currently the most expensive (average of £164). 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.

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.

Rainfall in Heathrow by month

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.

Temperature in Heathrow by month

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).

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Delta, KLM and Finnair from Idaho to London by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,957 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,957 reviews

Delta

8.0

Very Good

7,957 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,351 reviews

Delta

8.0

Very Good

7,957 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Finnair

7.6

Good

1,285 reviews

Delta

8.0

Very Good

7,957 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,756 reviews

Delta

8.0

Very Good

7,957 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Virgin Atlantic

7.4

Good

645 reviews

Delta

8.0

Very Good

7,957 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines to fly from Idaho to London Heathrow Airport one-way?
One-way options have recently been found by users for as low as £313 on Finnair. Other airlines that offer cheap prices include Delta from £343 and KLM from £343 one-way.
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 Idaho Falls Fanning Field - 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, January is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £112). Flying from Idaho to London Heathrow Airport in August is currently the most expensive (average of £164). 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

Deal

Hounslow

Milton Keynes

Croydon

Luton

Gatwick

Slough

Wembley

Crawley

Eastbourne

Northampton

Ilford

Southend-on-Sea

Watford

Hayes

Swindon

Ipswich

Folkestone

Winchester

Maidstone

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Idaho to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest£451	Average£912	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights

Fly with Cheapflights

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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Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Idaho to London Heathrow Airport from £248

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 23/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Idaho to Heathrow

Keep the following information in mind while searching for Idaho to Heathrow flight deals. Data was last updated 29 May 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 29 May 2025.

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 29 May 2025.

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

Everything you need to know about your flight from Idaho to London Heathrow Airport

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

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

Find hourly flight availability from Idaho to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 May 2025.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Delta, KLM and Finnair from Idaho to London by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Idaho to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines to fly from Idaho to London Heathrow Airport one-way?

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 Idaho?

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.

Top airline flying from Idaho to Heathrow

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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Travel Smart

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 29 May 2025.