In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

What are the most popular routes from United Kingdom to Islip, New York?

Most travelers choose Glasgow Intl - Islip Long Island, Edinburgh Turnhouse - Islip Long Island or London Heathrow - Islip Long Island when deciding on the best route from United Kingdom to Islip, New York.

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

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

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

Most people fly into Islip Long Island (ISP) if they book a flight to Islip from United Kingdom. Long Island is conveniently located just 7.2 mi from Islip’s city center.

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

Yes. In addition to deals on United Kingdom to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from United Kingdom to Islip?

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

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

Yes. Cheapflights offers flight deals from United Kingdom 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.

$674+ Flights from the United Kingdom to Islip, NY

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Cheap flight deals from United Kingdom to Islip

Best flights from United Kingdom to Islip
Discover carefully curated flight deals from United Kingdom to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 21, 2025.

Wed 2/46:30 pmLHR - ISP

2 stops30h 15mMultiple Airlines

Wed 2/1112:30 pmISP - LHR

1 stop13h 25mMultiple Airlines

Deal found 12/21

$1,603

One-way flights from United Kingdom to Islip
Search for one-way flight options from United Kingdom to Islip. Find affordable one-way fares based on user searches. Data last updated December 21, 2025.

Sun 6/76:25 amMAN - ISP

2 stops36h 03mMultiple Airlines

Deal found 12/21

$674

Find flight deals from United Kingdom to Islip

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$1,603 (Kiwi.com)
One-way from	$674 (Kiwi.com)
Popular in	July
Cheapest in	September
Average price	$644

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From United Kingdom to Islip Long Island

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One-way flight from United Kingdom to Islip Long Island

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Highest demand for flights based on searches. 7% potential increase in price ($46 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).

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Average for round-trip flights in December 2025

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Use the filters below to find and compare flights from the United Kingdom to Islip that are best for you.

Fly from

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Route

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Price

LondonIslip

LHR - ISP

LHRISP

London Heathrow

Wed 2/4

6:30 pm-7:45 pm

2 stops30h 15m

Islip Long Island

Wed 2/11

12:30 pm-6:55 am

1 stop13h 25m

$1,603

ManchesterIslip

MAN - ISP

MANISP

Manchester

Sun 6/7

6:25 am-1:28 pm

2 stops36h 03m

$674

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Best time to book a flight from United Kingdom to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from United Kingdom with our price prediction graph.

Estimated round-trip price

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Everything you need to know about your flight from the United Kingdom to Islip

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

Currently, July is the cheapest month in which you can book a flight from United Kingdom to Islip, New York (average of $237). Flying from United Kingdom to Islip, New York in June is currently the most expensive (average of $427). 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

What airport do you fly into for flights to Islip from United Kingdom?
Most people fly into Islip Long Island (ISP) if they book a flight to Islip from United Kingdom. Long Island is conveniently located just 7.2 mi from Islip’s city center.
What are the most popular routes from United Kingdom to Islip, New York?
Most travelers choose Glasgow Intl - Islip Long Island, Edinburgh Turnhouse - Islip Long Island or London Heathrow - Islip Long Island when deciding on the best route from United Kingdom to Islip, New York.
Can I find deals for flights from United Kingdom to Islip that include hotel bookings?
Yes. In addition to deals on United Kingdom to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from United Kingdom to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from United Kingdom to Islip.
Can I find deals for business class flights from United Kingdom to Islip?
Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Islip, New York?
Currently, July is the cheapest month in which you can book a flight from United Kingdom to Islip, New York (average of $237). Flying from United Kingdom to Islip, New York in June is currently the most expensive (average of $427). 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.

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$674+ Cheap flights from the United Kingdom to Islip, NY (ISP)

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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from United Kingdom to Islip with Cheapflights

1. Tell us where you want to go

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Cheap flight deals from United Kingdom to Islip

Best flights from United Kingdom to IslipDiscover carefully curated flight deals from United Kingdom to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 21, 2025.

Discover carefully curated flight deals from United Kingdom to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 21, 2025.

Find flight deals from United Kingdom to Islip

Keep the following information in mind while searching for United Kingdom to Islip flight deals. Data was last updated December 21, 2025.

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Use the filters below to find and compare flights from the United Kingdom to Islip that are best for you.

Best time to book a flight from United Kingdom to Islip

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Cheapflights Insights

Everything you need to know about your flight from the United Kingdom to Islip

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

Related info for your journey

Find useful and relevant information for your journey from United Kingdom 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 United Kingdom?

What are the most popular routes from United Kingdom to Islip, New York?

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

How can I find direct flights from United Kingdom to Islip?

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

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

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Best flights from United Kingdom to Islip
Discover carefully curated flight deals from United Kingdom to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 21, 2025.