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Cheap flights from Islip, New York to London Heathrow Airport from £827

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 25/1. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
11 tammi — 18 tammi1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Islip to Heathrow

Enter your travel dates to find the best prices.

Best flights from Islip to Heathrow
Discover carefully curated flight deals from Islip to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 joulukuu 2025.

su 25/112:30ISP - LHR
2 stops14h 35mMultiple Airlines
su 1/208:50LHR - ISP
2 stops15h 55mMultiple Airlines
Deal found 11/12£827
to 19/309:47ISP - LHR
2 stops27h 03mMultiple Airlines
to 2/418:10LHR - ISP
2 stops43h 59mMultiple Airlines
Deal found 10/12£1,518
pe 23/112:30ISP - LHR
1 stop13h 25mMultiple Airlines
ke 28/112:15LHR - ISP
2 stops27h 50mMultiple Airlines
Deal found 10/12£3,639
pe 23/112:30ISP - LHR
1 stop13h 25mMultiple Airlines
ma 26/120:35LHR - ISP
2 stops43h 30mMultiple Airlines
Deal found 10/12£3,640
ke 21/109:59ISP - LHR
1 stop15h 56mMultiple Airlines
ke 28/106:00LHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 10/12£3,650
ti 20/109:59ISP - LHR
1 stop15h 56mMultiple Airlines
to 29/106:00LHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 10/12£3,650
ke 21/112:30ISP - LHR
2 stops19h 10mMultiple Airlines
ti 27/109:20LHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 10/12£3,659
to 22/112:30ISP - LHR
2 stops19h 10mMultiple Airlines
to 29/109:20LHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 10/12£3,659
to 22/112:30ISP - LHR
2 stops17h 55mMultiple Airlines
ti 27/109:20LHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 10/12£3,659

Find flight deals from Islip to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 12 joulukuu 2025.

Round-trip from

£827

Popular in

December

Cheapest in

January

Average price

£544
25/1-1/2
  • 25/1-1/2
  • 4 total stops
  • 30h 30m total
  • Islip to London
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customise your flight search to find flights from Islip 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 12 joulukuu 2025.
Use the filters below to find and compare flights from Islip to London Heathrow Airport that are best for you.

Fly from

Islip

Fly to

Heathrow

Route

Depart

Return

Price

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

su 25/1

12:30-08:05

2 stops14h 35m

London Heathrow

su 1/2

08:50-19:45

2 stops15h 55m

£827

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

to 19/3

09:47-16:50

2 stops27h 03m

London Heathrow

to 2/4

18:10-09:09

2 stops43h 59m

£1,518

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

pe 23/1

12:30-06:55

1 stop13h 25m

London Heathrow

ke 28/1

12:15-11:05

2 stops27h 50m

£3,639

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

pe 23/1

12:30-06:55

1 stop13h 25m

London Heathrow

ma 26/1

20:35-11:05

2 stops43h 30m

£3,640

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

ke 21/1

09:59-06:55

1 stop15h 56m

London Heathrow

ke 28/1

06:00-19:45

2 stops18h 45m

£3,650

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

ti 20/1

09:59-06:55

1 stop15h 56m

London Heathrow

to 29/1

06:00-19:45

2 stops18h 45m

£3,650

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

ke 21/1

12:30-12:40

2 stops19h 10m

London Heathrow

ti 27/1

09:20-16:10

1 stop11h 50m

£3,659

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

to 22/1

12:30-12:40

2 stops19h 10m

London Heathrow

to 29/1

09:20-16:10

1 stop11h 50m

£3,659

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

to 22/1

12:30-11:25

2 stops17h 55m

London Heathrow

ti 27/1

09:20-16:10

1 stop11h 50m

£3,659

Flights are sorted by cheapest return flights first.

Deals found on 11/12

Best time to book a flight from Islip to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Islip 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 Islip to London Heathrow Airport

What is the cheapest month to book a flight from Islip, New York to London Heathrow Airport?

Currently, February is the cheapest month in which you can book a flight from Islip, New York to London Heathrow Airport (average of £291). Flying from Islip, New York to London Heathrow Airport in June is currently the most expensive (average of £431). 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.

Related info for your journey

Find useful and relevant information for your journey from Islip to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to London Heathrow?

    For a flight from Islip to London Heathrow, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Islip Long Island on a regular basis.

  • Can I find deals for flights from Islip to Heathrow that include hotel bookings?

    Yes. In addition to deals on Islip to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Islip to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Heathrow.

  • Can I find deals for business class flights from Islip to Heathrow?

    Yes. Cheapflights offers flight deals from Islip 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 Islip, New York to London Heathrow Airport?

    Currently, February is the cheapest month in which you can book a flight from Islip, New York to London Heathrow Airport (average of £291). Flying from Islip, New York to London Heathrow Airport in June is currently the most expensive (average of £431). 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
Croydon
Slough
Northampton
Hounslow
Luton
Gatwick
Wembley
Ilford
Brentford
Colchester
Watford
Hayes
Crawley
Winchester
Swindon
Deal
Bedford
Romford
Chichester

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Islip to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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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 Islip to Heathrow?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Islip 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 Islip to Heathrow?

Cheapflights helps you find that perfect flight to Heathrow from Islip 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 Islip to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from Islip to Heathrow with no change fees.

Can Cheapflights notify me if prices for flights from Islip to Heathrow become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Heathrow from Islip today and book when prices fit your budget.

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