In terms of precipitation, rainfall in Islip, New York ranges from 84.0 - 112.0 inches per month. March is typically the wettest month, when rainfall can reach 112.0 mm. February is typically the driest time to visit Islip, New York when rainfall is around 84.0 mm.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).

What is the cheapest time of day to fly from LON to ISP?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Islip, New York as you normally would.

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.

£1,171+ Cheap Flights from London to Islip, New York

Cheap flight deals from London to Islip

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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 18 August 2026.

Mon 31/809:50 -

2 stops29h 03m

Thu 3/910:57 -

1 stop13h 23m

Deal found 17/8£1,171

Find flight deals from London to Islip

Round-trip from	£1,171
Popular in	July
Cheapest in	February
Average price	£547

31/8-3/9
3 total stops
42h 26m total
London to Islip

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Highest demand for flights based on searches. 18% potential increase in price (£80 potential increase over avg. return price).

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Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).

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Average for round-trip flights in August 2026

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Return

Price

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LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Mon 31/8

09:50-09:53

2 stops29h 03m

Islip Long Island

Thu 3/9

10:57-05:20

1 stop13h 23m

£1,171

Flights are sorted by cheapest return flights first.

Deals found on 17/8

Sorted by cheapest first

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.

LON-ISP

LHR-ISP

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

LON-ISP

LHR-ISP

No data available for this route at this time. Please check back soon.

Related info for your journey

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.

See more FAQs

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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.

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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?

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Cheap flights from London to Islip, New York from £1,171

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 31/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from London to Islip

Cheapest flights from London to IslipExplore 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 18 August 2026.

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 18 August 2026.

Best flights from London to IslipDiscover carefully curated flight deals from London to Islip that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 August 2026.

Discover carefully curated flight deals from London to Islip that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 August 2026.

Last-minute flights from London to IslipDiscover last-minute flight deals from London to Islip. Data last updated 18 August 2026 and is based on user searches.

Discover last-minute flight deals from London to Islip. Data last updated 18 August 2026 and is based on user searches.

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Best time to book a flight from London to Islip

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Related info for your journey

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

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

How can I find direct flights from London to Islip?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for London to Islip

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Islip by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to New York

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London and Islip flights

Browse other London and Islip flight options. Last updated on 18 August 2026.

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How does Cheapflights help users find flights from London to Islip?

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

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

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

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Travel Smart

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 18 August 2026.

Best flights from London to Islip
Discover carefully curated flight deals from London to Islip that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 August 2026.

Last-minute flights from London to Islip
Discover last-minute flight deals from London to Islip. Data last updated 18 August 2026 and is based on user searches.