HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
United Kingdom

$312+ Cheap flights from Islip, NY (ISP) to the United Kingdom

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 3/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Jan 20 — Jan 271
Tue 1/20
Tue 1/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to United Kingdom with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Islip to United Kingdom

Cheapest flights from Islip to United Kingdom
Explore the most affordable flight options available from Islip to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 21, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:20 pmISP - LGW
1 stop16h 40mMultiple Airlines
Wed 12/311:00 pmLGW - ISP
2 stops53h 45mMultiple Airlines
Deal found 12/19$1,610
This Mytrip deal was found by Cheapflights users on 12/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:25 amISP - LHR
3 stops18h 45mMultiple Airlines
Wed 12/318:50 amLHR - ISP
2 stops15h 55mMultiple Airlines
Deal found 12/19$2,271

Find flight deals from Islip to United Kingdom

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

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$732
(Kiwi.com)

One-way from

$312
(Lucky2Go)

Popular in

December

Cheapest in

January

Average price

$731
Provider with most accurate pricing for New York (NYC)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-London (LON) flights.
Search Deals
From Islip Long Island to United Kingdom
Search Deals
One-way flight from Islip Long Island to United Kingdom
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

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to United Kingdom 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 2,558,603 searches. Data last updated December 21, 2025.
Use the filters below to find and compare flights from Islip to the United Kingdom that are best for you.

Fly from

Islip

Fly to

United Kingdom

Route

Depart

Return

Price

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 1/18

7:58 pm-10:00 am

1 stop33h 02m

London Gatwick

Wed 1/28

11:40 am-6:48 pm

2 stops36h 08m

$732

IslipManchester

ISP - MAN

ISPMAN

Islip Long Island

Mon 2/2

10:00 am-7:00 am

1 stop16h 00m

Manchester

Mon 2/9

2:15 pm-8:55 am

2 stops23h 40m

$1,082

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 2/2

10:00 am-10:00 pm

2 stops31h 00m

London Heathrow

Mon 2/9

7:50 am-8:55 am

2 stops30h 05m

$1,138

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 2/3

10:00 am-1:25 pm

2 stops22h 25m

London Heathrow

Tue 2/10

8:50 am-8:55 am

2 stops29h 05m

$1,158

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 1/18

9:59 am-7:00 am

1 stop16h 01m

London Heathrow

Wed 1/28

1:30 pm-7:45 pm

1 stop11h 15m

$1,296

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 1/16

12:30 pm-5:30 pm

2 stops24h 00m

London Heathrow

Fri 1/23

9:20 am-4:10 pm

1 stop11h 50m

$1,524

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 2/2

10:00 am-7:30 am

1 stop16h 30m

London Gatwick

Mon 2/9

11:20 am-8:55 am

1 stop26h 35m

$6,588

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 1/16

10:00 am-7:30 am

1 stop16h 30m

London Gatwick

Fri 1/23

11:20 am-8:52 am

1 stop26h 32m

$6,627

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 3/27

1:42 pm-10:00 am

1 stop16h 18m

$312

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Tue 1/6

12:00 pm-6:00 am

2 stops37h 00m

$342

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 13 results
1
2

Best time to book a flight from Islip to United Kingdom

Have a flexible travel schedule? Discover the best time to fly to United Kingdom 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 the United Kingdom

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

Currently, November is the cheapest month in which you can book a flight from Islip, New York to United Kingdom (average of $75). Flying from Islip, New York to United Kingdom in June is currently the most expensive (average of $451). 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 United Kingdom. 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 United Kingdom?

    Located just 7.2 mi from the city center, Islip Long Island (ISP) is the airport most travelers will use when flying to United Kingdom from Islip.

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

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to United Kingdom 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 United Kingdom?

    Currently, November is the cheapest month in which you can book a flight from Islip, New York to United Kingdom (average of $75). Flying from Islip, New York to United Kingdom in June is currently the most expensive (average of $451). 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

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 Islip to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Charles de Gaulle flights
Newark to Charles de Gaulle flights
John F Kennedy Intl to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Istanbul flights
Newark to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Gatwick flights
Newark to Orly flights
John F Kennedy Intl to London City flights
LaGuardia to Heathrow flights
John F Kennedy Intl to Orly flights
Newark to Gatwick flights
Newark to Athens flights
John F Kennedy Intl to Lisbon flights
LaGuardia to Charles de Gaulle flights
John F Kennedy Intl to Barcelona-El Prat flights
John F Kennedy Intl to Stansted flights
Newark to Madrid flights
John F Kennedy Intl to Madrid flights
LaGuardia to Gatwick flights
Newark to Barcelona-El Prat flights
Newark to Dublin flights
Newark to Malpensa flights
John F Kennedy Intl to Malpensa flights
John F Kennedy Intl to Dublin flights
John F Kennedy Intl to Athens flights
Newark to Lisbon flights
Newark to Frankfurt flights
John F Kennedy Intl to Frederic Chopin flights
LaGuardia to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Amsterdam flights
John F Kennedy Intl to Zurich flights
John F Kennedy Intl to Frankfurt flights
John F Kennedy Intl to Luton flights
Newark to Zurich flights
Newark to London City flights
Newark to Amsterdam flights
Newark to Stansted flights
John F Kennedy Intl to Geneva flights
John F Kennedy Intl to Linate flights
Newark to Luton flights
LaGuardia to Athens flights
John F Kennedy Intl to Sabiha Gokcen flights
LaGuardia to Lisbon flights
LaGuardia to Madrid flights
John F Kennedy Intl to Keflavik Intl flights
John F Kennedy Intl to Beauvais-Tille flights
LaGuardia to Barcelona-El Prat flights
Newark to Geneva flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.