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

The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as £296. However, be on the lookout for offers from KLM and Air France, as they are both options that can get you from Idaho to London for a low price.

In terms of precipitation, rainfall in London 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 when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, 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?

While some choose either Spokane - London Heathrow or Boise Air Term. Gowen Fld - London Gatwick, Boise Air Term. Gowen Fld - London Heathrow is the most popular route from Idaho to London.

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

To save up to 42% on this flight, we recommend booking at least 54 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Idaho to London from £539 1-2 weeks out and tickets from £645 for flights departing within the next 72 hours.

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

Flights from Idaho to London lean towards being more expensive in June. Prices are generally better when you fly from Idaho to London in October, with the cheapest ticket starting at £423.

Can I find deals for flights from Idaho to London that include hotel bookings?

Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Idaho to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.

Can I find deals for business class flights from Idaho to London?

Yes. Cheapflights offers flight deals from Idaho to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£212+ Flights from Idaho to London

Cheap flight deals from Idaho to London

Round-trip from	£452
One-way from	£212
Popular in	June
Cheapest in	October
Average price	£915

United Airlines
26/8-2/9
3 total stops
43h 26m total
Idaho to London

Search Deals

3/9
2 total stops
31h 26m total
Idaho to London

Search Deals

Highest demand for flights based on searches. 24% potential increase in price (£161 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£27 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

Find flight deals from Idaho to London

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 July 2025.

Tue 26/808:20BOI - LHR

1 stop15h 00mUnited Airlines

Tue 2/914:05LHR - BOI

2 stops28h 26mUnited Airlines

Deal found 13/7£452

Wed 20/816:20BOI - LHR

1 stop12h 00mDelta

Wed 27/811:30LHR - BOI

2 stops19h 20mDelta

Deal found 12/7£463

Mon 4/813:15GEG - LHR

1 stop17h 00mDelta

Thu 14/806:15LHR - GEG

2 stops17h 58mDelta

Deal found 12/7£463

Wed 23/714:00BOI - LHR

1 stop14h 20mVirgin Atlantic

Wed 20/809:55LHR - BOI

2 stops17h 25mVirgin Atlantic

Deal found 14/7£464

Wed 1/1015:30GEG - LHR

1 stop14h 45mKLM

Tue 7/1006:30LHR - GEG

2 stops16h 14mKLM

Deal found 14/7£464

Wed 20/811:20IDA - LHR

2 stops19h 10mDelta

Tue 26/806:15LHR - IDA

2 stops23h 12mDelta

Deal found 14/7£466

Wed 20/814:35IDA - LHR

1 stop12h 05mUnited Airlines

Tue 26/809:30LHR - IDA

2 stops38h 45mUnited Airlines

Deal found 14/7£468

Wed 3/915:06BOI - LHR

1 stop15h 04mKLM

Tue 16/917:25LHR - BOI

1 stop13h 32mKLM

Deal found 15/7£468

Wed 27/812:35GEG - LHR

1 stop13h 50mUnited Airlines

Wed 3/909:30LHR - GEG

2 stops45h 35mUnited Airlines

Deal found 13/7£468

Thu 7/818:07GEG - LGW

2 stops32h 48mMultiple Airlines

Sun 24/810:55LGW - GEG

1 stop32h 40mMultiple Airlines

Deal found 15/7£478

Mon 25/812:35GEG - LHR

1 stop13h 50mLufthansa

Mon 8/919:10LHR - GEG

2 stops33h 53mLufthansa

Deal found 14/7£496

Thu 27/1112:40GEG - LHR

1 stop15h 00mMultiple Airlines

Thu 4/1206:20LHR - GEG

2 stops17h 47mMultiple Airlines

Deal found 14/7£500

Best flights from Idaho to London
Discover carefully curated flight deals from Idaho to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 July 2025.

Tue 26/808:20BOI - LHR

1 stop15h 00mUnited Airlines

Tue 2/914:05LHR - BOI

2 stops28h 26mUnited Airlines

Deal found 13/7£452

Wed 20/816:20BOI - LHR

1 stop12h 00mDelta

Wed 27/811:30LHR - BOI

2 stops19h 20mDelta

Deal found 12/7£463

Mon 5/107:05LWS - LHR

1 stop19h 55mKLM

Tue 10/317:50LHR - LWS

2 stops34h 12mKLM

Deal found 13/7£464

Thu 7/818:07GEG - LGW

2 stops32h 48mMultiple Airlines

Sun 24/810:55LGW - GEG

1 stop32h 40mMultiple Airlines

Deal found 15/7£478

Mon 25/812:35GEG - LHR

1 stop13h 50mLufthansa

Mon 8/919:10LHR - GEG

2 stops33h 53mLufthansa

Deal found 14/7£496

Fri 19/913:38BOI - LHR

1 stop17h 47mIberia

Fri 26/910:30LHR - BOI

1 stop18h 18mIberia

Deal found 15/7£505

Wed 3/905:00BOI - LHR

2 stops23h 50mAir Canada

Tue 9/915:50LHR - BOI

2 stops36h 24mAir Canada

Deal found 13/7£507

Sun 10/814:36GEG - LHR

1 stop15h 59mVirgin Atlantic

Fri 19/914:30LHR - GEG

2 stops17h 33mVirgin Atlantic

Deal found 12/7£517

Wed 3/915:45BOI - LHR

2 stops19h 45mScandinavian Airlines

Tue 16/906:40LHR - BOI

2 stops23h 20mScandinavian Airlines

Deal found 14/7£523

Wed 27/816:11JAC - LHR

1 stop15h 14mAmerican Airlines

Wed 3/908:25LHR - JAC

2 stops19h 19mAmerican Airlines

Deal found 13/7£535

Fri 15/813:10BOI - LHR

1 stop14h 20mFinnair

Sun 31/810:30LHR - BOI

1 stop18h 10mFinnair

Deal found 15/7£542

Wed 31/1211:35GEG - LGW

2 stops15h 20mIcelandair

Wed 14/111:55LGW - GEG

2 stops17h 04mIcelandair

Deal found 13/7£640

Last-minute flights from Idaho to London
Discover last-minute flight deals from Idaho to London. Data last updated 15 July 2025 and is based on user searches.

Tue 22/712:21GEG - LHR

1 stop14h 49mKLM

Tue 5/810:55LHR - GEG

1 stop13h 23mKLM

Deal found 14/7£745

Tue 22/707:00GEG - LHR

1 stop15h 20mUnited Airlines

Tue 5/814:05LHR - GEG

2 stops38h 58mUnited Airlines

Deal found 14/7£838

Wed 23/714:00BOI - LHR

1 stop14h 20mVirgin Atlantic

Wed 20/809:55LHR - BOI

2 stops17h 25mVirgin Atlantic

Deal found 14/7£464

Wed 23/714:00BOI - LHR

2 stops16h 30mDelta

Wed 20/809:55LHR - BOI

2 stops17h 25mDelta

Deal found 14/7£467

Wed 23/715:17BOI - LHR

1 stop14h 53mKLM

Wed 20/812:45LHR - BOI

1 stop18h 11mKLM

Deal found 14/7£469

Wed 23/708:18BOI - LGW

1 stop19h 37mMultiple Airlines

Wed 20/810:55LGW - BOI

1 stop18h 59mMultiple Airlines

Deal found 14/7£662

Wed 23/711:40JAC - LHR

2 stops19h 05mDelta

Wed 6/811:00LHR - JAC

1 stop16h 49mDelta

Deal found 15/7£663

Wed 23/720:46BOI - LGW

2 stops34h 54mIcelandair

Wed 20/815:35LGW - BOI

2 stops38h 05mIcelandair

Deal found 14/7£702

Wed 23/714:32BOI - LCY

2 stops18h 53mLufthansa

Wed 20/808:45LCY - BOI

2 stops19h 29mLufthansa

Deal found 14/7£731

Wed 23/710:47BOI - LHR

3 stops22h 38mScandinavian Airlines

Wed 20/806:40LHR - BOI

2 stops18h 36mScandinavian Airlines

Deal found 14/7£834

Wed 23/707:00BOI - LHR

2 stops16h 45mUnited Airlines

Fri 1/807:25LHR - BOI

2 stops17h 42mUnited Airlines

Deal found 14/7£847

Wed 23/710:50JAC - LHR

1 stop15h 50mUnited Airlines

Wed 6/811:25LHR - JAC

1 stop13h 30mUnited Airlines

Deal found 14/7£859

One-way flights from Idaho to London
Search for one-way flight options from Idaho to London. Find affordable one-way fares based on user searches. Data last updated 15 July 2025.

Wed 3/919:29GEG - LGW

2 stops31h 26mMultiple Airlines

Deal found 14/7£212

Sat 6/920:51GEG - LHR

2 stops31h 04mMultiple Airlines

Deal found 14/7£222

Mon 25/819:17BOI - LGW

2 stops28h 03mMultiple Airlines

Deal found 14/7£268

Mon 25/819:17BOI - LHR

3 stops33h 38mMultiple Airlines

Deal found 14/7£278

Mon 25/807:00BOI - LHR

2 stops16h 20mUnited Airlines

Deal found 14/7£296

Tue 5/818:25GEG - LHR

2 stops28h 05mUnited Airlines

Deal found 13/7£296

Mon 25/819:17BOI - LCY

3 stops39h 13mMultiple Airlines

Deal found 14/7£302

Mon 25/809:52BOI - LCY

2 stops19h 38mUnited Airlines

Deal found 14/7£324

Sat 1/1106:05IDA - LHR

3 stops44h 00mMultiple Airlines

Deal found 13/7£329

Tue 2/913:00GEG - LHR

1 stop12h 50mKLM

Deal found 14/7£340

Wed 31/1212:30LWS - LHR

1 stop13h 30mKLM

Deal found 15/7£344

Mon 1/915:25GEG - LHR

1 stop14h 50mAir France

Deal found 14/7£344

Cheapflights Fare Finder

Use the filters below to find and compare flights from Idaho to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 26/8

08:20-06:20

1 stop15h 00m

London Heathrow

Tue 2/9

14:05-11:31

2 stops28h 26m

£452

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 13/10

14:05-13:10

1 stop15h 05m

London Heathrow

Wed 29/10

06:20-16:57

2 stops17h 37m

£462

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 20/8

16:20-11:20

1 stop12h 00m

London Heathrow

Wed 27/8

11:30-23:50

2 stops19h 20m

£463

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 4/8

15:38-11:20

1 stop11h 42m

London Heathrow

Thu 14/8

06:15-16:13

2 stops17h 58m

£463

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Mon 5/1

07:05-11:00

1 stop19h 55m

London Heathrow

Tue 10/3

17:50-21:02

2 stops34h 12m

£464

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/12

08:40-11:00

1 stop19h 20m

London Heathrow

Tue 9/12

06:30-16:29

2 stops16h 59m

£464

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 26/8

06:00-09:50

1 stop20h 50m

London Heathrow

Tue 2/9

11:45-18:11

2 stops37h 26m

£464

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 28/10

13:00-11:00

1 stop15h 00m

London Heathrow

Thu 6/11

06:30-14:44

2 stops16h 14m

£464

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 20/8

14:35-09:40

1 stop12h 05m

London Heathrow

Tue 26/8

09:30-17:15

2 stops38h 45m

£468

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 27/8

12:35-10:25

1 stop13h 50m

London Heathrow

Wed 3/9

09:30-23:05

2 stops45h 35m

£468

Flights are sorted by cheapest return flights first.

Deals found on 14/7

Showing 1-10 of 60 results

...

Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London 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

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

Currently, January is the cheapest month in which you can book a flight from Idaho to London (average of £112). Flying from Idaho to London 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 LON?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to London as you normally would.

Reviews of airlines servicing London

Read reviews from past customers who have flown with Delta, Alaska Airlines, andKLM from Idaho to London. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,956 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

7,956 reviews

Delta

8.0

Very Good

7,956 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!

Alaska Airlines

8.0

Very Good

10,000 reviews

Delta

8.0

Very Good

7,956 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

1,372 reviews

Delta

8.0

Very Good

7,956 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

1,316 reviews

Delta

8.0

Very Good

7,956 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!

Air France

7.5

Good

1,466 reviews

Delta

8.0

Very Good

7,956 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 one-way?
The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as £296. However, be on the lookout for offers from KLM and Air France, as they are both options that can get you from Idaho to London for a low price.
What are the most popular routes from Idaho to London?
While some choose either Spokane - London Heathrow or Boise Air Term. Gowen Fld - London Gatwick, Boise Air Term. Gowen Fld - London Heathrow is the most popular route from Idaho to London.
Can I find deals for flights from Idaho to London that include hotel bookings?
Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Idaho to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.
Can I find deals for business class flights from Idaho to London?
Yes. Cheapflights offers flight deals from Idaho to London 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?
Currently, January is the cheapest month in which you can book a flight from Idaho to London (average of £112). Flying from Idaho to London 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

Milton Keynes

Croydon

Hounslow

Deal

Gatwick

Slough

Luton

Wembley

Crawley

Eastbourne

Ilford

Hayes

Ipswich

Southend-on-Sea

Folkestone

Watford

Winchester

Maidstone

Guildford

Chichester

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Idaho to London

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest£451	Average£892	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights

Fly with Cheapflights

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

When you search for this flight from Idaho to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Idaho to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Idaho to London flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Idaho to London become cheaper?

Of course! You can now track prices for flights from Idaho to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Our users can plan ahead with confidence and find flights with no change fees

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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 from £212

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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Idaho to London

Keep the following information in mind while searching for Idaho to London flight deals. Data was last updated 15 July 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Idaho to London

Cheapest flights from Idaho to LondonExplore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 July 2025.

Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Idaho to London that are best for you.

Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London from Idaho with our price prediction graph.

Cheapflights Insights

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

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

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

Find hourly flight availability from Idaho to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 July 2025.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 15 July 2025.

Read reviews from past customers who have flown with Delta, Alaska Airlines, andKLM from Idaho to London. Reviews also offer insight into each airline's 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 London. 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 one-way?

What are the most popular routes from Idaho to London?

Can I find deals for flights from Idaho to London that include hotel bookings?

How can I find direct flights from Idaho to London?

Can I find deals for business class flights from Idaho to London?

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

Travelling to a place near London?

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 London

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

Top airline flying from Idaho to London

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 London?

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

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

Can Cheapflights notify me if prices for flights from Idaho to London become cheaper?

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Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 July 2025.