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Cheap flights from Idaho to London Heathrow Airport from £248

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 28/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
19 Aug — 26 Aug1
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 20 July 2026.

Mon 2/1106:15
BOI
-
LHR
1 stop22h 00m
United Airlines
Wed 4/1106:50
LHR
-
BOI
2 stops23h 16m
United Airlines
Deal found 15/7£554
Wed 2/1214:43
BOI
-
LHR
1 stop11h 57m
United Airlines
Fri 4/1206:35
LHR
-
BOI
2 stops21h 41m
United Airlines
Deal found 19/7£607
Tue 1/1217:22
BOI
-
LHR
1 stop33h 18m
United Airlines
Fri 4/1206:35
LHR
-
BOI
2 stops21h 41m
United Airlines
Deal found 19/7£612
Tue 1/1210:39
BOI
-
LHR
1 stop16h 01m
United Airlines
Thu 3/1207:30
LHR
-
BOI
2 stops20h 46m
United Airlines
Deal found 19/7£615
Mon 30/1117:44
BOI
-
LHR
1 stop32h 56m
United Airlines
Thu 3/1207:30
LHR
-
BOI
2 stops19h 05m
United Airlines
Deal found 19/7£618
Sun 29/1106:15
BOI
-
LHR
1 stop22h 00m
Multiple Airlines
Tue 1/1211:05
LHR
-
BOI
2 stops43h 01m
Multiple Airlines
Deal found 19/7£624
Wed 18/1112:50
GEG
-
LHR
2 stops24h 10m
Lufthansa
Wed 9/1207:40
LHR
-
GEG
2 stops21h 29m
Lufthansa
Deal found 15/7£646
Sat 24/1013:40
GEG
-
LHR
2 stops33h 50m
Multiple Airlines
Fri 30/1007:40
LHR
-
GEG
2 stops20h 25m
Multiple Airlines
Deal found 17/7£648
Wed 2/1205:17
GEG
-
LHR
1 stop17h 33m
Iberia
Tue 8/1206:05
LHR
-
GEG
2 stops22h 52m
Iberia
Deal found 19/7£650
Wed 14/1005:00
GEG
-
LHR
1 stop20h 40m
United Airlines
Wed 28/1006:35
LHR
-
GEG
2 stops21h 30m
United Airlines
Deal found 15/7£651
Wed 18/1105:00
GEG
-
LHR
1 stop20h 40m
United Airlines
Wed 25/1106:35
LHR
-
GEG
2 stops22h 26m
United Airlines
Deal found 17/7£652
Sun 29/1106:15
BOI
-
LHR
1 stop22h 00m
United Airlines
Fri 4/1206:35
LHR
-
BOI
2 stops21h 41m
United Airlines
Deal found 19/7£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 20 July 2026.

Round-trip from

£554

One-way from

£248

Popular in

January

Cheapest in

October

Average price

£1,043
United Airlines
  • United Airlines
  • 2/11-4/11
  • 3 total stops
  • 45h 16m total
  • Idaho to London
Search Deals
United Airlines
  • United Airlines
  • 28/12
  • 2 total stops
  • 19h 55m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 33% potential increase in price (£311 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 19% potential price decrease (£99 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 20 July 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 2/11

06:15-11:15

1 stop22h 00m

London Heathrow

Wed 4/11

06:50-23:06

2 stops23h 16m

£554

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 11/1

11:30-12:00

1 stop16h 30m

London Heathrow

Wed 13/1

06:35-21:09

2 stops22h 34m

£563

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 2/11

13:51-12:20

1 stop15h 29m

London Heathrow

Wed 4/11

14:45-23:51

1 stop16h 06m

£659

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 11/1

13:23-12:20

1 stop14h 57m

London Heathrow

Wed 13/1

14:45-21:11

1 stop14h 26m

£659
Fastest return journey

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 8/12

16:03-12:20

1 stop13h 17m

London Heathrow

Tue 15/12

14:45-22:39

1 stop14h 54m

£661

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:46-13:45

1 stop16h 59m

London Heathrow

Tue 13/10

08:15-21:42

2 stops20h 27m

£667

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sat 28/11

23:30-06:25

1 stop23h 55m

London Heathrow

Thu 3/12

06:30-20:17

2 stops20h 47m

£673

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 29/9

14:44-12:25

1 stop14h 41m

London Heathrow

Wed 7/10

07:25-22:33

2 stops22h 08m

£673

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 23/9

05:00-06:30

2 stops17h 30m

London Heathrow

Wed 14/10

08:40-22:16

2 stops21h 36m

£675

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 9/12

05:00-07:10

2 stops18h 10m

London Heathrow

Fri 18/12

07:40-22:22

1 stop22h 42m

£676

Flights are sorted by cheapest return flights first.

Deals found on 15/7

Showing 1-10 of 59 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, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £602). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,502). 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 and Alaska Airlines fly from Idaho to London Heathrow Airport in about 14h 57m. The time it takes to get you to your destination can typically vary by up to 7h 03m. 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 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 £602). Flying from Idaho to London Heathrow Airport in January is currently the most expensive (average of £1,502). 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
Luton
Wembley
Gatwick
Slough
Ilford
Hayes
Croydon
Colchester
Brentford
Eastbourne
Northampton
Watford
Swindon
Southend-on-Sea
Poole
Kingston upon Thames
Southall
Aylesbury

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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O'Hare Intl to Gatwick flights
Los Angeles 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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