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Cheap flights from Idaho to London Heathrow Airport from £245

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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
9 Jun — 16 Jun1
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 May 2026.

Sun 6/906:30
BOI
-
LHR
2 stops20h 30m
United Airlines
Tue 8/907:30
LHR
-
BOI
2 stops20h 49m
United Airlines
Deal found 5/5£560
Sat 5/910:37
BOI
-
LHR
2 stops38h 08m
United Airlines
Tue 8/907:30
LHR
-
BOI
2 stops20h 49m
United Airlines
Deal found 5/5£569
Sat 3/1013:37
GEG
-
LHR
2 stops60h 18m
Lufthansa
Wed 7/1008:30
LHR
-
GEG
2 stops20h 23m
Lufthansa
Deal found 6/5£633
Wed 9/906:00
GEG
-
LHR
1 stop17h 25m
United Airlines
Wed 7/1007:25
LHR
-
GEG
2 stops22h 51m
United Airlines
Deal found 6/5£637
Tue 29/914:55
BOI
-
LHR
1 stop14h 55m
Iberia
Wed 7/1006:15
LHR
-
BOI
2 stops21h 50m
Iberia
Deal found 7/5£641
Wed 23/912:45
GEG
-
LHR
1 stop16h 05m
Iberia
Wed 14/1006:15
LHR
-
GEG
2 stops22h 32m
Iberia
Deal found 5/5£642
Mon 10/808:25
BOI
-
LHR
1 stop18h 35m
Delta
Thu 20/806:30
LHR
-
BOI
2 stops19h 18m
Delta
Deal found 7/5£644
Tue 29/915:05
GEG
-
LHR
1 stop13h 05m
Delta
Fri 9/1006:30
LHR
-
GEG
2 stops18h 39m
Delta
Deal found 6/5£644
Tue 29/914:45
BOI
-
LHR
1 stop17h 50m
Delta
Wed 7/1011:45
LHR
-
BOI
2 stops19h 19m
Delta
Deal found 5/5£645
Wed 12/805:00
GEG
-
LHR
1 stop20h 40m
United Airlines
Thu 20/806:55
LHR
-
GEG
2 stops22h 19m
United Airlines
Deal found 8/5£645
Wed 12/805:36
GEG
-
LHR
2 stops17h 34m
Delta
Tue 15/909:55
LHR
-
GEG
2 stops19h 09m
Delta
Deal found 7/5£648
Mon 26/1013:15
BOI
-
LHR
2 stops16h 25m
Virgin Atlantic
Wed 4/1111:45
LHR
-
BOI
2 stops19h 10m
Virgin Atlantic
Deal found 10/5£648

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 May 2026.

Round-trip from

£560

One-way from

£245

Popular in

January

Cheapest in

April

Average price

£610
United Airlines
  • United Airlines
  • 6/9-8/9
  • 4 total stops
  • 41h 19m total
  • Idaho to London
Search Deals
United Airlines
  • United Airlines
  • 2/9
  • 1 total stop
  • 19h 00m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£134 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£46 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 10 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

Sun 6/9

06:30-09:40

1 stop20h 10m

London Heathrow

Tue 8/9

09:00-22:32

2 stops20h 32m

£611

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 6/10

05:00-07:55

2 stops18h 55m

London Heathrow

Tue 20/10

07:25-22:16

2 stops22h 51m

£644

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 11/8

12:40-13:15

1 stop16h 35m

London Heathrow

Fri 21/8

08:40-19:14

2 stops18h 34m

£645

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 10/8

11:12-11:20

2 stops17h 08m

London Heathrow

Thu 20/8

06:30-18:48

2 stops19h 18m

£648

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 3/10

13:37-21:20

2 stops23h 43m

London Heathrow

Tue 27/10

06:35-23:38

2 stops24h 03m

£648

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 15/9

12:42-17:40

2 stops21h 58m

London Heathrow

Mon 28/9

19:50-18:35

3 stops29h 45m

£650

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 18/8

17:53-12:25

1 stop11h 32m

London Heathrow

Tue 25/8

07:30-17:16

2 stops16h 46m

£653

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 25/10

05:00-09:40

1 stop21h 40m

London Heathrow

Mon 2/11

13:50-21:09

2 stops39h 19m

£653

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 18/8

14:20-10:55

1 stop13h 35m

London Heathrow

Tue 25/8

12:55-21:20

1 stop15h 25m

£666

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 10/8

15:29-15:35

1 stop17h 06m

London Heathrow

Thu 20/8

10:55-17:52

1 stop13h 57m

£666

Flights are sorted by cheapest return flights first.

Deals found on 8/5

Showing 1-10 of 43 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 £423). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £796). 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, Delta, and Scandinavian Airlines fly from Idaho to London Heathrow Airport in about 16h 35m. The time it takes to get you to your destination can typically vary by up to 5h 23m. There are 4643 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, July is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £423). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £796). 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
Milton Keynes
Hounslow
Croydon
Wembley
Northampton
Luton
Gatwick
Ilford
Slough
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Swindon
Ipswich
Southend-on-Sea
Guildford

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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Reagan-National to Gatwick flights
San Francisco to Gatwick flights
San Francisco to London City flights
San Francisco to Stansted flights
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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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