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Cheap flights from London to Islip, New York from £1,062

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/12. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ISP
26 Nov — 3 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from London to Islip

Enter your travel dates to find the best prices.

Cheapest flights from London to Islip
Explore the most affordable flight options available from London to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 October 2025.

Tue 23/1206:40LHR - ISP
2 stops18h 05mMultiple Airlines
Sat 27/1212:40ISP - LHR
2 stops15h 40mMultiple Airlines
Deal found 27/10£1,062
Tue 30/1210:00LHR - ISP
2 stops30h 04mMultiple Airlines
Mon 5/112:40ISP - LHR
1 stop13h 10mMultiple Airlines
Deal found 27/10£1,145

Cheap flight deals from London to Islip

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Islip (ISP). 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 27 October 2025.

Round-trip from

£1,062

Popular in

December

Cheapest in

September

Average price

£418
23/12-27/12
  • 23/12-27/12
  • 4 total stops
  • 33h 45m total
  • London to Islip
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£15 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
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Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Islip 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 27 October 2025.
Use the filters below to find and compare flights from London to Islip that are best for you.

Fly from

London

Fly to

Islip

Route

Depart

Return

Price

LondonIslip

LHR - ISP

LHRISP

London Heathrow

Tue 23/12

06:40-19:45

2 stops18h 05m

Islip Long Island

Sat 27/12

12:40-09:20

2 stops15h 40m

£1,062

LondonIslip

LHR - ISP

LHRISP

London Heathrow

Tue 30/12

10:00-11:04

2 stops30h 04m

Islip Long Island

Mon 5/1

12:40-06:50

1 stop13h 10m

£1,145

Flights are sorted by cheapest return flights first.

Deals found on 27/10

Best time to book a flight from London to Islip

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

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

Currently, August is the cheapest month in which you can book a flight from London to Islip, New York (average of £98). Flying from London to Islip, New York in July is currently the most expensive (average of £341). 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 London to Islip. 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 into for flights to Islip from London?

    For a flight from London to Islip, you will be flying into 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 inbound flights from London per day. 0 airlines have flights to Islip Long Island from London on a regular basis.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from London to Islip, New York (average of £98). Flying from London to Islip, New York in July is currently the most expensive (average of £341). 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

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Alternative routes for London to Islip

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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 London to Islip?

Deals for London to Islip flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from London to Islip?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from London to Islip for you. Better yet — we are completely free to use.

Can Cheapflights find flights from London to Islip with no change fees?

Certainly. Search results for flights to Islip from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes! Start tracking prices for London to Islip flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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