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$651+ Cheap flights from Islip, NY (ISP) to the United Kingdom

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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Jan 29 — Feb 51
Thu 1/29
Thu 2/5
1 adult, Economy
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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 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/29. 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.
Tue 12/3012:30 pmISP - LHR
1 stop13h 25mMultiple Airlines
Tue 1/66:30 pmLHR - ISP
2 stops30h 15mMultiple Airlines
Deal found 12/29$2,548

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 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$651
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$745
Provider with most accurate pricing for New York (NYC)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-London (LON) flights.
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From Islip Long Island to United Kingdom
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($4 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 30, 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

Thu 2/12

3:34 pm-10:00 am

1 stop13h 26m

London Gatwick

Thu 2/19

2:00 pm-7:38 am

1 stop22h 38m

$651

IslipEdinburgh

ISP - EDI

ISPEDI

Islip Long Island

Thu 2/12

3:34 pm-10:40 am

2 stops38h 06m

Edinburgh Turnhouse

Thu 2/19

5:50 am-7:38 am

2 stops30h 48m

$861

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 2/13

8:33 am-10:00 am

1 stop20h 27m

London Gatwick

Fri 2/20

2:00 pm-11:10 am

2 stops26h 10m

$862

IslipManchester

ISP - MAN

ISPMAN

Islip Long Island

Thu 2/12

3:34 pm-10:45 am

2 stops38h 11m

Manchester

Thu 2/19

10:30 am-7:38 am

1 stop26h 08m

$1,151

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 2/11

10:00 am-2:45 pm

2 stops23h 45m

London Heathrow

Wed 2/18

9:10 am-8:39 am

2 stops28h 29m

$1,256

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 1/21

12:30 pm-7:00 am

1 stop13h 30m

London Heathrow

Wed 1/28

7:10 pm-11:05 am

1 stop20h 55m

$1,278

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 1/25

12:30 pm-7:00 am

1 stop13h 30m

London Heathrow

Sun 2/1

7:10 pm-11:05 am

1 stop20h 55m

$1,278

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 5/24

1:51 pm-2:55 pm

2 stops20h 04m

London Heathrow

Thu 6/4

3:10 pm-12:56 pm

2 stops50h 46m

$1,317

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 2/12

9:29 am-3:35 pm

2 stops25h 06m

London Heathrow

Thu 2/19

7:50 am-8:39 am

2 stops29h 49m

$1,680

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/29

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

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