In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

If weather is an important factor for your trip to London, 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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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

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

Most accurate provider : When it comes to deals on Islip, New York-London flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-London flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-London flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Islip, New York-London flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

For a flight from Islip to London, 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 per day. 0 airlines have flights to London from Islip Long Island on a regular basis.

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

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

How can I find direct flights from Islip to London?

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

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

Yes. Cheapflights offers flight deals from Islip to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$592+ Flights from Islip, NY to London

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1. Tell us where you want to go

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2. Select your favorite providers

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Cheap flight deals from Islip to London

Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

Thu 12/2512:20 pmISP - LGW

1 stop16h 40mMultiple Airlines

Fri 1/22:00 pmLGW - ISP

1 stop33h 45mMultiple Airlines

Deal found 12/16

$1,756

Thu 12/2512:30 pmISP - LHR

2 stops15h 00mMultiple Airlines

Fri 1/26:00 amLHR - ISP

2 stops18h 45mMultiple Airlines

Deal found 12/16

$3,199

Best flights from Islip to London
Discover carefully curated flight deals from Islip to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 16, 2025.

Thu 1/297:26 pmISP - LGW

2 stops33h 34mMultiple Airlines

Thu 2/52:00 pmLGW - ISP

1 stop35h 47mMultiple Airlines

Deal found 12/14

$592

Sat 1/1010:00 amISP - LHR

2 stops23h 25mMultiple Airlines

Sun 1/116:45 pmLHR - ISP

2 stops43h 07mMultiple Airlines

Deal found 12/13

$2,077

Thu 1/2910:00 amISP - LHR

2 stops15h 55mMultiple Airlines

Thu 2/58:50 amLHR - ISP

2 stops15h 55mMultiple Airlines

Deal found 12/14

$5,222

Sat 1/1010:00 amISP - LGW

1 stop16h 30mMultiple Airlines

Sun 1/1111:20 amLGW - ISP

1 stop26h 32mMultiple Airlines

Deal found 12/15

$7,021

Last-minute flights from Islip to London
Discover last-minute flight deals from Islip to London. Data last updated December 16, 2025 and is based on user searches.

Sat 1/1010:00 amISP - LHR

2 stops23h 25mMultiple Airlines

Sun 1/116:45 pmLHR - ISP

2 stops43h 07mMultiple Airlines

Deal found 12/13

$2,077

Sat 1/1010:00 amISP - LGW

1 stop16h 30mMultiple Airlines

Sun 1/1111:20 amLGW - ISP

1 stop26h 32mMultiple Airlines

Deal found 12/15

$7,021

Thu 1/297:26 pmISP - LGW

2 stops33h 34mMultiple Airlines

Thu 2/52:00 pmLGW - ISP

1 stop35h 47mMultiple Airlines

Deal found 12/14

$592

Thu 1/2910:00 amISP - LHR

2 stops15h 55mMultiple Airlines

Thu 2/58:50 amLHR - ISP

2 stops15h 55mMultiple Airlines

Deal found 12/14

$5,222

Find flight deals from Islip to London

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$592 (Kiwi.com)
Popular in	December
Cheapest in	January
Average price	$731

Provider with most accurate pricing for Islip Long Island-London (LON) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Islip Long Island-London (LON) flights.

Search Deals

From Islip Long Island to London (LON)

Search Deals

High demand for flights, 0% potential price rise

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 1/29

7:26 pm-10:00 am

2 stops33h 34m

London Gatwick

Thu 2/5

2:00 pm-8:47 pm

1 stop35h 47m

$592

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 1/10

10:00 am-2:25 pm

2 stops23h 25m

London Heathrow

Sun 1/11

6:45 pm-8:52 am

2 stops43h 07m

$2,077

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 1/29

10:00 am-6:55 am

2 stops15h 55m

London Heathrow

Thu 2/5

8:50 am-7:45 pm

2 stops15h 55m

$5,222

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 1/10

10:00 am-7:30 am

1 stop16h 30m

London Gatwick

Sun 1/11

11:20 am-8:52 am

1 stop26h 32m

$7,021

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Compare providers for flights from Islip to London

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to London in December.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy2 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Islip, New York-London flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-London flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-London flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Islip, New York-London flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Islip to London

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

Estimated round-trip 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

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

Currently, November is the cheapest month in which you can book a flight from Islip, New York to London (average of $282). Flying from Islip, New York to London in June is currently the most expensive (average of $534). 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 from for flights from Islip to London?
For a flight from Islip to London, 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 per day. 0 airlines have flights to London from Islip Long Island on a regular basis.
Can I find deals for flights from Islip to London that include hotel bookings?
Yes. In addition to deals on Islip to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to London.
Can I find deals for business class flights from Islip to London?
Yes. Cheapflights offers flight deals from Islip to London 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?
Currently, November is the cheapest month in which you can book a flight from Islip, New York to London (average of $282). Flying from Islip, New York to London in June is currently the most expensive (average of $534). 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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$592+ Cheap flights from Islip, NY (ISP) to London (LON)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/29. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to London with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to London

Cheapest flights from Islip to LondonExplore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

Find flight deals from Islip to London

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Compare providers for flights from Islip to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to London in December.

Best time to book a flight from Islip to London

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

Cheapflights Insights

Everything you need to know about your flight from Islip to London

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

Related info for your journey

Find useful and relevant information for your journey from Islip to London. 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?

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

How can I find direct flights from Islip to London?

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

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

Traveling to a place near London?

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Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.