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Cheap flights from Idaho to London Heathrow Airport from £217

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 16/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
28 Jun — 5 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 29 May 2026.

Mon 9/1118:55
BOI
-
LHR
1 stop33h 20m
Brussels Airlines
Thu 12/1111:05
LHR
-
BOI
2 stops43h 01m
Brussels Airlines
Deal found 25/5£551
Mon 9/1116:05
BOI
-
LHR
1 stop36h 10m
United Airlines
Thu 12/1106:50
LHR
-
BOI
2 stops23h 16m
United Airlines
Deal found 28/5£560
Tue 29/910:37
BOI
-
LHR
1 stop18h 48m
Lufthansa
Tue 20/1006:55
LHR
-
BOI
2 stops21h 36m
Lufthansa
Deal found 25/5£642
Wed 23/913:37
GEG
-
LHR
1 stop14h 58m
Lufthansa
Wed 14/1006:55
LHR
-
GEG
2 stops23h 21m
Lufthansa
Deal found 26/5£642
Wed 9/913:37
GEG
-
LHR
1 stop14h 58m
Lufthansa
Wed 7/1007:30
LHR
-
GEG
2 stops22h 46m
Lufthansa
Deal found 26/5£646
Wed 9/905:00
GEG
-
LHR
1 stop23h 35m
United Airlines
Wed 7/1008:40
LHR
-
GEG
2 stops21h 36m
United Airlines
Deal found 28/5£647
Mon 14/912:15
IDA
-
LHR
1 stop15h 40m
American Airlines
Tue 29/908:15
LHR
-
IDA
2 stops20h 05m
American Airlines
Deal found 25/5£648
Tue 29/910:37
BOI
-
LHR
1 stop16h 03m
Lufthansa
Wed 7/1007:30
LHR
-
BOI
2 stops21h 01m
Lufthansa
Deal found 26/5£651
Tue 13/1012:50
GEG
-
LHR
1 stop14h 20m
Lufthansa
Thu 22/1007:30
LHR
-
GEG
2 stops21h 23m
Lufthansa
Deal found 26/5£651
Wed 14/1012:45
GEG
-
LHR
1 stop16h 05m
Iberia
Wed 28/1019:05
LHR
-
GEG
2 stops23h 53m
Iberia
Deal found 27/5£651
Sun 20/913:00
GEG
-
LHR
2 stops24h 40m
Scandinavian Airlines
Mon 28/919:30
LHR
-
GEG
2 stops29h 30m
Scandinavian Airlines
Deal found 28/5£652
Tue 8/913:00
GEG
-
LHR
2 stops20h 40m
Scandinavian Airlines
Mon 14/919:30
LHR
-
GEG
2 stops29h 30m
Scandinavian Airlines
Deal found 27/5£653

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 29 May 2026.

Round-trip from

£551

One-way from

£217

Popular in

January

Cheapest in

April

Average price

£620
Brussels Airlines
  • Brussels Airlines
  • 9/11-12/11
  • 3 total stops
  • 76h 21m total
  • Idaho to London
Search Deals
Virgin Atlantic
  • Virgin Atlantic
  • 16/9
  • 1 total stop
  • 16h 00m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£138 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£48 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 29 May 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

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 9/11

16:05-11:15

1 stop36h 10m

London Heathrow

Thu 12/11

06:50-23:06

2 stops23h 16m

£560

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 14/9

12:15-10:55

1 stop15h 40m

London Heathrow

Tue 29/9

08:15-21:20

2 stops20h 05m

£648

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Wed 9/9

07:15-10:00

1 stop19h 45m

London Heathrow

Fri 18/9

06:30-16:50

2 stops17h 20m

£654

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Wed 9/9

13:10-10:00

1 stop13h 50m

London Heathrow

Wed 16/9

06:30-16:50

2 stops17h 20m

£654

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Wed 9/9

07:15-08:50

2 stops18h 35m

London Heathrow

Wed 16/9

06:30-16:50

2 stops17h 20m

£657

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 3/10

11:30-21:20

2 stops25h 50m

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

12:14-16:00

2 stops20h 46m

London Heathrow

Mon 28/9

19:50-18:40

3 stops29h 50m

£659

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Fri 25/9

13:00-16:00

2 stops19h 00m

London Heathrow

Tue 6/10

07:05-18:48

3 stops19h 43m

£659

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

17:53-12:35

1 stop11h 42m

London Heathrow

Tue 13/10

07:25-09:53

2 stops33h 28m

£660

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 9/9

14:33-15:05

1 stop16h 32m

London Heathrow

Wed 7/10

17:00-23:54

1 stop14h 54m

£661

Flights are sorted by cheapest return flights first.

Deals found on 24/5

Showing 1-10 of 47 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 £430). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £938). 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, American Airlines, and Delta fly from Idaho to London Heathrow Airport in about 15h 40m. The time it takes to get you to your destination can typically vary by up to 20h 30m. There are 4705 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 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 £430). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £938). 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
Northampton
Wembley
Luton
Gatwick
Croydon
Ilford
Slough
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Ipswich
Watford
Swindon
Romford
Guildford
Borehamwood

Browse thousands of different options on Cheapflights for your next trip

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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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Philadelphia to Heathrow flights
Boston to London City flights
Boston to Stansted flights
Los Angeles to Stansted flights
Dulles Intl to Gatwick flights
Reagan-National to Heathrow flights
Denver to Heathrow flights
O'Hare Intl to Gatwick flights
Dulles Intl to London City flights
Orlando to Gatwick flights
O'Hare Intl to Stansted flights
Baltimore to Gatwick flights
Los Angeles to London City flights
Sky Harbor Intl to Heathrow flights
Reagan-National to Gatwick flights
O'Hare Intl to London City flights
San Francisco to Gatwick flights
Seattle to Gatwick flights
San Francisco to Stansted flights
Dallas/Fort Worth to Gatwick flights

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?

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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