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Islip

$1,470+ Cheap flights from the United Kingdom to Islip, NY (ISP)

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 3/26. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ISP
Mar 14 — Mar 211
Sat 3/14
Sat 3/21
1 adult, Economy
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Cheap flight deals from United Kingdom to Islip

Cheapest flights from United Kingdom to Islip
Explore the most affordable flight options available from United Kingdom to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 12, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/9. 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 3/268:35 pm
LHR
-
ISP
2 stops42h 35m
Multiple Airlines
Thu 4/29:59 am
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Deal found 2/9$1,470
This Icelandair deal was found by Cheapflights users on 2/9. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/1612:15 pm
LHR
-
ISP
2 stops15h 40m
Multiple Airlines
Sun 3/225:55 pm
ISP
-
LHR
2 stops12h 55m
Multiple Airlines
Deal found 2/9$1,491
This TravelUp deal was found by Cheapflights users on 2/8. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/219:50 am
MAN
-
ISP
2 stops27h 49m
Multiple Airlines
Sat 3/289:45 am
ISP
-
MAN
2 stops40h 55m
Multiple Airlines
Deal found 2/8$1,793
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 3/129:40 am
LHR
-
ISP
1 stop13h 04m
Multiple Airlines
Wed 4/1511:50 am
ISP
-
LHR
2 stops39h 15m
Multiple Airlines
Deal found 2/9$1,934
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Sat 3/285:00 pm
LHR
-
ISP
2 stops29h 44m
Multiple Airlines
Sat 4/49:59 am
ISP
-
LHR
1 stop15h 31m
Multiple Airlines
Deal found 2/11$2,252
This TravelUp deal was found by Cheapflights users on 2/11. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/288:20 am
GLA
-
ISP
2 stops28h 35m
Multiple Airlines
Sat 4/41:07 pm
ISP
-
GLA
2 stops21h 18m
Multiple Airlines
Deal found 2/11$2,531

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 February 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,470
(Kiwi.com)

Popular in

July

Cheapest in

September

Average price

$491
Provider with most accurate pricing for London (LON)-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-New York (NYC) flights.
Search Deals
From United Kingdom to Islip Long Island
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($49 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from United Kingdom to Islip 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 February 12, 2026.
Use the filters below to find and compare flights from the United Kingdom to Islip that are best for you.

Fly from

United Kingdom

Fly to

Islip

Route

Depart

Return

Price

LondonIslip

LHR - ISP

LHRISP

London Heathrow

Thu 3/26

8:35 pm-11:10 am

2 stops42h 35m

Islip Long Island

Thu 4/2

9:59 am-6:45 am

1 stop15h 46m

$1,470

LondonIslip

LHR - ISP

LHRISP

London Heathrow

Mon 3/16

12:15 pm-11:55 pm

2 stops15h 40m

Islip Long Island

Sun 3/22

5:55 pm-10:50 am

2 stops12h 55m

$1,491

LondonIslip

LHR - ISP

LHRISP

London Heathrow

Thu 3/12

9:40 am-6:44 pm

1 stop13h 04m

Islip Long Island

Wed 4/15

11:50 am-8:05 am

2 stops39h 15m

$1,934

LondonIslip

LHR - ISP

LHRISP

London Heathrow

Sat 3/28

5:00 pm-6:44 pm

2 stops29h 44m

Islip Long Island

Sat 4/4

9:59 am-6:30 am

1 stop15h 31m

$2,252

GlasgowIslip

GLA - ISP

GLAISP

Glasgow Intl

Sat 3/28

8:20 am-8:55 am

2 stops28h 35m

Islip Long Island

Sat 4/4

1:07 pm-3:25 pm

2 stops21h 18m

$2,531

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

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
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 the United Kingdom to Islip

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

Currently, January is the cheapest month in which you can book a flight from United Kingdom to Islip, New York (average of $350). Flying from United Kingdom to Islip, New York in July is currently the most expensive (average of $455). 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 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?

    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, London Heathrow - Islip Long Island or Edinburgh Turnhouse - 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, January is the cheapest month in which you can book a flight from United Kingdom to Islip, New York (average of $350). Flying from United Kingdom to Islip, New York in July is currently the most expensive (average of $455). 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

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead

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