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Cheap flights from Idaho to London Heathrow Airport from £270

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
21 Feb — 28 Feb1
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 22 January 2026.

Tue 17/207:00
BOI
-
LHR
1 stop20h 00m
Iberia
Tue 24/220:50
LHR
-
BOI
2 stops32h 32m
Iberia
Deal found 20/1£430
Tue 24/206:00
GEG
-
LHR
1 stop16h 50m
Iberia
Tue 10/320:50
LHR
-
GEG
2 stops31h 22m
Iberia
Deal found 20/1£430
Wed 28/106:00
GEG
-
LHR
1 stop21h 40m
Iberia
Wed 4/220:50
LHR
-
GEG
2 stops29h 59m
Iberia
Deal found 21/1£430
Tue 17/207:00
BOI
-
LHR
1 stop20h 00m
Iberia
Thu 26/220:50
LHR
-
BOI
2 stops32h 32m
Iberia
Deal found 20/1£431
Tue 17/206:00
GEG
-
LHR
1 stop20h 00m
Iberia
Wed 4/307:35
LHR
-
GEG
2 stops21h 37m
Iberia
Deal found 20/1£432
Tue 17/205:00
BOI
-
LHR
2 stops19h 10m
Air Canada
Tue 24/215:00
LHR
-
BOI
2 stops29h 38m
Air Canada
Deal found 20/1£438
Mon 16/206:25
BOI
-
LHR
1 stop20h 15m
United Airlines
Fri 27/218:00
LHR
-
BOI
2 stops34h 32m
United Airlines
Deal found 20/1£441
Wed 25/306:00
GEG
-
LHR
1 stop21h 00m
Iberia
Tue 14/420:50
LHR
-
GEG
2 stops31h 38m
Iberia
Deal found 20/1£441
Wed 4/314:40
BOI
-
LHR
1 stop12h 00m
United Airlines
Wed 11/306:35
LHR
-
BOI
2 stops20h 54m
United Airlines
Deal found 20/1£443
Tue 10/214:37
BOI
-
LHR
1 stop12h 03m
United Airlines
Wed 25/206:35
LHR
-
BOI
2 stops24h 13m
United Airlines
Deal found 21/1£444
Tue 17/210:25
BOI
-
LHR
1 stop16h 15m
United Airlines
Thu 26/211:35
LHR
-
BOI
1 stop19h 13m
United Airlines
Deal found 20/1£447
Tue 18/812:42
GEG
-
LHR
1 stop17h 43m
Iberia
Tue 1/911:30
LHR
-
GEG
2 stops32h 22m
Iberia
Deal found 20/1£447

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 22 January 2026.

Round-trip from

£430

One-way from

£270

Popular in

June

Cheapest in

October

Average price

£637
Iberia
  • Iberia
  • 17/2-24/2
  • 3 total stops
  • 52h 32m total
  • Idaho to London
Search Deals
9/3
  • 9/3
  • 3 total stops
  • 26h 20m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£155 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 January 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 22 January 2026.
Use the filters below to find and compare flights from Idaho to London Heathrow Airport that are best for you.

Fly from

Idaho

Fly to

Heathrow

Route

Depart

Return

Price

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 4/3

06:25-08:30

2 stops19h 05m

London Heathrow

Wed 11/3

14:30-23:57

2 stops39h 27m

£441

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 16/2

06:25-09:40

1 stop20h 15m

London Heathrow

Fri 27/2

18:00-21:32

2 stops34h 32m

£441

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 24/3

10:21-09:40

1 stop17h 19m

London Heathrow

Tue 31/3

07:25-09:54

2 stops33h 29m

£450

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 4/3

13:44-12:00

1 stop15h 16m

London Heathrow

Wed 11/3

10:05-23:57

1 stop19h 52m

£453

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 17/2

08:41-07:25

1 stop15h 44m

London Heathrow

Fri 27/2

10:05-21:11

1 stop18h 06m

£453

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 10/2

07:45-07:25

1 stop16h 40m

London Heathrow

Wed 25/2

11:35-21:32

1 stop16h 57m

£453

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 23/3

05:00-09:40

1 stop22h 40m

London Heathrow

Wed 8/4

09:00-22:35

2 stops20h 35m

£456

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 7/4

13:43-14:25

1 stop17h 42m

London Heathrow

Tue 14/4

10:05-23:39

1 stop20h 34m

£465

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 4/3

12:38-12:00

1 stop15h 22m

London Heathrow

Mon 9/3

11:10-11:43

2 stops31h 33m

£468

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 4/3

13:25-10:30

1 stop13h 05m

London Heathrow

Mon 9/3

06:30-19:04

2 stops19h 34m

£469

Flights are sorted by cheapest return flights first.

Deals found on 21/1

Showing 1-10 of 44 results
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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, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £463). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £808). 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 Air Canada, United Airlines, and American Airlines fly from Idaho to London Heathrow Airport in about 17h 42m. The time it takes to get you to your destination can typically vary by up to 2h 33m. 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 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, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £463). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £808). 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
Luton
Croydon
Northampton
Wembley
Gatwick
Slough
Hounslow
Ilford
Brentford
Hayes
Colchester
Watford
Swindon
Crawley
Bedford
Kingston upon Thames
Chelmsford
Eastbourne
Romford

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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Dulles Intl to London City flights
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O'Hare Intl to Gatwick flights
San Francisco to Gatwick flights
Los Angeles to London City flights
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Los Angeles to Stansted flights
Minneapolis to Heathrow flights
O'Hare Intl to London City flights
San Francisco to London City flights
O'Hare Intl 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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