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Cheap flights from Idaho to London Heathrow Airport from £235

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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
10 Jul — 17 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to Heathrow

Enter your travel dates to find the best prices.

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 10 June 2026.

Mon 9/1116:05
BOI
-
LHR
1 stop32h 20m
United Airlines
Thu 12/1106:50
LHR
-
BOI
2 stops23h 16m
United Airlines
Deal found 6/6£562
Tue 8/906:30
BOI
-
LHR
2 stops42h 15m
United Airlines
Fri 11/907:25
LHR
-
BOI
2 stops18h 54m
United Airlines
Deal found 6/6£572
Mon 9/1118:55
BOI
-
LHR
1 stop33h 20m
Brussels Airlines
Thu 12/1111:05
LHR
-
BOI
2 stops43h 01m
Brussels Airlines
Deal found 7/6£590
Wed 11/1110:45
IDA
-
LHR
1 stop15h 55m
United Airlines
Fri 13/1106:35
LHR
-
IDA
2 stops33h 53m
United Airlines
Deal found 7/6£625
Wed 9/917:21
GEG
-
LHR
1 stop13h 44m
Alaska Airlines
Wed 7/1017:00
LHR
-
GEG
1 stop28h 07m
Alaska Airlines
Deal found 8/6£628
Mon 9/1116:21
BOI
-
LHR
1 stop12h 59m
Alaska Airlines
Thu 12/1114:45
LHR
-
BOI
1 stop30h 42m
Alaska Airlines
Deal found 6/6£632
Wed 9/905:00
GEG
-
LHR
2 stops16h 55m
United Airlines
Wed 7/1008:40
LHR
-
GEG
2 stops21h 36m
United Airlines
Deal found 8/6£645
Mon 12/1007:00
IDA
-
LHR
1 stop16h 20m
American Airlines
Wed 28/1008:10
LHR
-
IDA
2 stops19h 12m
American Airlines
Deal found 10/6£647
Mon 9/1107:00
BOI
-
LHR
2 stops18h 30m
Air Canada
Thu 12/1114:30
LHR
-
BOI
2 stops40h 29m
Air Canada
Deal found 6/6£651
Wed 14/1012:45
GEG
-
LHR
1 stop17h 40m
Iberia
Wed 28/1019:40
LHR
-
GEG
2 stops23h 18m
Iberia
Deal found 10/6£651
Sun 23/810:35
BOI
-
LHR
2 stops24h 05m
Scandinavian Airlines
Tue 1/906:40
LHR
-
BOI
2 stops19h 08m
Scandinavian Airlines
Deal found 6/6£654
Wed 23/905:40
GEG
-
LHR
1 stop20h 20m
Delta
Wed 14/1008:40
LHR
-
GEG
2 stops18h 47m
Delta
Deal found 10/6£654

Find flight deals from Idaho to Heathrow

Keep the following information in mind while searching for Idaho to Heathrow flight deals. Data was last updated 10 June 2026.

Round-trip from

£562

One-way from

£235

Popular in

January

Cheapest in

October

Average price

£968
United Airlines
  • United Airlines
  • 9/11-12/11
  • 3 total stops
  • 55h 36m total
  • Idaho to London
Search Deals
10/11
  • 10/11
  • 3 total stops
  • 41h 00m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£153 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease (£51 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Idaho to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 10 June 2026.
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

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 11/11

07:00-16:50

2 stops26h 50m

London Heathrow

Fri 13/11

15:00-17:22

2 stops33h 22m

£631

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Tue 1/12

07:15-10:00

1 stop19h 45m

London Heathrow

Tue 8/12

20:25-19:05

2 stops29h 40m

£655

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 3/10

11:05-21:20

2 stops26h 15m

London Heathrow

Tue 27/10

06:35-23:38

2 stops24h 03m

£657

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 15/9

12:14-17:40

2 stops22h 26m

London Heathrow

Mon 28/9

19:50-18:40

3 stops29h 50m

£660
Fastest return journey

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 11/10

16:38-15:05

1 stop14h 27m

London Heathrow

Thu 29/10

14:45-23:54

1 stop16h 09m

£663

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:46-15:05

1 stop18h 19m

London Heathrow

Tue 13/10

17:00-15:35

1 stop29h 35m

£666

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 20/9

11:10-16:25

3 stops21h 15m

London Heathrow

Sun 27/9

06:40-17:00

3 stops18h 20m

£666

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 17/10

13:05-07:25

1 stop34h 20m

London Heathrow

Fri 30/10

15:00-12:40

2 stops28h 40m

£669

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

06:00-13:05

2 stops24h 05m

London Heathrow

Tue 13/10

09:20-22:19

2 stops19h 59m

£679

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 1/10

14:08-12:50

1 stop15h 42m

London Heathrow

Thu 29/10

08:15-21:22

2 stops19h 07m

£686

Flights are sorted by cheapest return flights first.

Deals found on 9/6

Showing 1-10 of 42 resultsSorted by cheapest first
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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, July is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £431). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £936). 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?

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.

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

    Airlines like United Airlines, KLM, and Scandinavian Airlines fly from Idaho to London Heathrow Airport in about 19h 45m. The time it takes to get you to your destination can typically vary by up to 7h 05m. 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 Spokane - London Heathrow. You may also consider Boise Air Term. Gowen Fld - 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, July is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £431). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £936). 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

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Milton Keynes
Wembley
Luton
Gatwick
Slough
Ilford
Croydon
Hayes
Brentford
Colchester
Northampton
Kingston upon Thames
Eastbourne
Watford
Swindon
Ipswich
Poole
Guildford
Romford

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Alternative routes for Idaho to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Baltimore to Gatwick flights
Philadelphia to Heathrow flights
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Los Angeles to Stansted flights
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Los Angeles to London City flights
Reagan-National to Gatwick flights
O'Hare Intl to Gatwick flights
San Francisco to Gatwick flights
O'Hare Intl to Stansted flights
O'Hare Intl to London City flights
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Fly with Cheapflights

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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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