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Cheap flights from Idaho to London Heathrow Airport from £243

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 16/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
19 May — 26 May1
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 19 April 2026.

Sat 29/819:01
BOI
-
LHR
2 stops28h 29m
Multiple Airlines
Mon 31/820:25
LHR
-
BOI
2 stops32h 00m
Multiple Airlines
Deal found 15/4£603
Sun 6/910:23
BOI
-
LHR
2 stops24h 17m
Scandinavian Airlines
Thu 17/919:30
LHR
-
BOI
2 stops30h 05m
Scandinavian Airlines
Deal found 14/4£623
Tue 8/917:44
BOI
-
LHR
1 stop32h 56m
United Airlines
Fri 11/909:30
LHR
-
BOI
2 stops18h 55m
United Airlines
Deal found 14/4£628
Wed 9/905:00
GEG
-
LHR
2 stops18h 15m
United Airlines
Wed 7/1006:55
LHR
-
GEG
2 stops35h 35m
United Airlines
Deal found 17/4£643
Tue 4/810:20
BOI
-
LHR
2 stops19h 30m
Lufthansa
Thu 20/806:55
LHR
-
BOI
2 stops17h 58m
Lufthansa
Deal found 17/4£646
Wed 23/912:45
GEG
-
LHR
1 stop17h 40m
Iberia
Wed 14/1006:15
LHR
-
GEG
2 stops22h 32m
Iberia
Deal found 14/4£646
Wed 12/812:45
GEG
-
LHR
1 stop17h 40m
Iberia
Tue 15/906:15
LHR
-
GEG
2 stops22h 32m
Iberia
Deal found 16/4£647
Sun 6/914:45
BOI
-
LHR
1 stop14h 25m
Delta
Tue 15/906:30
LHR
-
BOI
2 stops16h 08m
Delta
Deal found 14/4£649
Tue 22/906:00
GEG
-
LHR
1 stop24h 10m
United Airlines
Tue 13/1007:25
LHR
-
GEG
2 stops24h 13m
United Airlines
Deal found 15/4£649
Sun 20/916:50
BOI
-
LHR
1 stop15h 10m
Delta
Tue 13/1006:30
LHR
-
BOI
2 stops20h 47m
Delta
Deal found 16/4£649
Tue 1/1208:20
BOI
-
LHR
1 stop16h 05m
United Airlines
Wed 9/1206:35
LHR
-
BOI
2 stops18h 20m
United Airlines
Deal found 18/4£650
Wed 12/805:00
GEG
-
LHR
2 stops18h 45m
United Airlines
Tue 15/906:55
LHR
-
GEG
2 stops22h 09m
United Airlines
Deal found 17/4£650

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 19 April 2026.

Round-trip from

£603

One-way from

£243

Popular in

January

Cheapest in

October

Average price

£523
Lufthansa
  • Lufthansa
  • 29/8-31/8
  • 4 total stops
  • 60h 29m total
  • Idaho to London
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 16/8
  • 1 total stop
  • 15h 44m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£161 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£47 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 19 April 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

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 27/9

06:30-10:15

1 stop19h 45m

London Heathrow

Wed 14/10

06:30-14:45

2 stops16h 15m

£649

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 22/9

13:38-20:40

2 stops23h 02m

London Heathrow

Tue 13/10

07:25-23:38

2 stops24h 13m

£652

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 23/9

10:05-10:20

2 stops16h 15m

London Heathrow

Wed 14/10

06:30-14:45

2 stops16h 15m

£652

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 3/10

16:00-09:40

1 stop33h 40m

London Heathrow

Tue 27/10

06:35-21:09

2 stops21h 34m

£653

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 6/9

16:05-15:35

1 stop16h 30m

London Heathrow

Fri 11/9

06:15-15:38

2 stops16h 23m

£654

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 24/8

10:37-09:40

1 stop16h 03m

London Heathrow

Fri 28/8

14:05-13:35

2 stops30h 30m

£656

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/10

13:10-10:00

1 stop13h 50m

London Heathrow

Tue 13/10

10:55-22:19

1 stop18h 24m

£670

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 22/9

14:05-13:05

1 stop15h 00m

London Heathrow

Tue 13/10

09:55-21:37

1 stop19h 42m

£670

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 27/9

16:00-12:35

1 stop12h 35m

London Heathrow

Wed 14/10

14:50-21:09

1 stop14h 19m

£670

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 22/9

16:05-15:35

1 stop16h 30m

London Heathrow

Thu 8/10

10:55-22:03

1 stop18h 08m

£671

Flights are sorted by cheapest return flights first.

Deals found on 15/4

Showing 1-10 of 60 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 £427). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £802). 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 Virgin Atlantic fly from Idaho to London Heathrow Airport in about 13h 50m. The time it takes to get you to your destination can typically vary by up to 9h 12m. 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 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 £427). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £802). 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
Wembley
Croydon
Northampton
Hounslow
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Romford
Eastbourne
Swindon
Chelmsford
Ipswich
Southend-on-Sea

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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Los Angeles to Gatwick flights
LaGuardia to Stansted flights
San Francisco to Gatwick flights
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Baltimore to Gatwick flights
Minneapolis to Heathrow flights
San Francisco to Stansted flights
San Francisco to London City flights
Newark to London City 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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