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$944+ 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 3/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
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 February 13, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 3/272:31 pm
ISP
-
LGW
2 stops39h 29m
Multiple Airlines
Fri 4/32:00 pm
LGW
-
ISP
1 stop14h 14m
Multiple Airlines
Deal found 2/10$944
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Sun 3/295:08 pm
ISP
-
LGW
1 stop35h 52m
Multiple Airlines
Sun 4/59:25 am
LGW
-
ISP
2 stops21h 13m
Multiple Airlines
Deal found 2/12$1,166
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/199:59 am
ISP
-
EDI
2 stops17h 51m
Multiple Airlines
Tue 3/248:20 am
EDI
-
ISP
2 stops14h 24m
Multiple Airlines
Deal found 2/9$1,266
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/199:59 am
ISP
-
GLA
2 stops20h 46m
Multiple Airlines
Tue 3/248:10 pm
GLA
-
ISP
2 stops26h 34m
Multiple Airlines
Deal found 2/9$1,297
This Expedia deal was found by Cheapflights users on 2/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:39 am
ISP
-
LHR
2 stops30h 26m
Multiple Airlines
Wed 3/42:15 pm
LHR
-
ISP
2 stops47h 32m
Multiple Airlines
Deal found 2/10$1,305
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/289:59 am
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sat 4/49:40 am
LHR
-
ISP
1 stop14h 04m
Multiple Airlines
Deal found 2/11$1,313
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 3/2811:50 am
ISP
-
LGW
2 stops18h 10m
Multiple Airlines
Sat 4/42:00 pm
LGW
-
ISP
1 stop14h 42m
Multiple Airlines
Deal found 2/11$1,369
This Ovago deal was found by Cheapflights users on 2/12. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/299:59 am
ISP
-
LHR
1 stop17h 01m
Multiple Airlines
Sun 4/58:10 pm
LHR
-
ISP
1 stop27h 34m
Multiple Airlines
Deal found 2/12$1,395
This Gurufare deal was found by Cheapflights users on 2/10. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/279:59 am
ISP
-
LHR
1 stop17h 01m
Multiple Airlines
Fri 4/311:00 am
LHR
-
ISP
1 stop12h 44m
Multiple Airlines
Deal found 2/10$1,469
This Ovago deal was found by Cheapflights users on 2/12. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/299:59 am
ISP
-
GLA
2 stops17h 06m
Multiple Airlines
Sun 4/57:35 am
GLA
-
ISP
2 stops16h 09m
Multiple Airlines
Deal found 2/12$1,495
This Ovago deal was found by Cheapflights users on 2/10. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/279:59 am
ISP
-
MAN
2 stops17h 36m
Multiple Airlines
Fri 4/38:55 pm
MAN
-
ISP
2 stops26h 49m
Multiple Airlines
Deal found 2/10$1,548
This Booking.com deal was found by Cheapflights users on 2/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:59 am
ISP
-
LGW
3 stops25h 41m
Multiple Airlines
Wed 3/47:50 pm
LGW
-
ISP
3 stops27h 54m
Multiple Airlines
Deal found 2/10$1,593

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 February 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$944
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$565
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
Highest demand for flights based on searches. 3% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($13 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 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 February 13, 2026.
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

Fri 3/27

2:31 pm-10:00 am

2 stops39h 29m

London Gatwick

Fri 4/3

2:00 pm-11:14 pm

1 stop14h 14m

$944

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 3/29

5:08 pm-10:00 am

1 stop35h 52m

London Gatwick

Sun 4/5

9:25 am-1:38 am

2 stops21h 13m

$1,166

IslipEdinburgh

ISP - EDI

ISPEDI

Islip Long Island

Thu 3/19

9:59 am-7:50 am

2 stops17h 51m

Edinburgh Turnhouse

Tue 3/24

8:20 am-6:44 pm

2 stops14h 24m

$1,266

IslipGlasgow

ISP - GLA

ISPGLA

Islip Long Island

Thu 3/19

9:59 am-10:45 am

2 stops20h 46m

Glasgow Intl

Tue 3/24

8:10 pm-6:44 pm

2 stops26h 34m

$1,297

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 2/26

9:39 am-9:05 pm

2 stops30h 26m

London Heathrow

Wed 3/4

2:15 pm-8:47 am

2 stops47h 32m

$1,305

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 3/28

9:59 am-5:45 am

1 stop15h 46m

London Heathrow

Sat 4/4

9:40 am-6:44 pm

1 stop14h 04m

$1,313

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 3/28

11:50 am-10:00 am

2 stops18h 10m

London Gatwick

Sat 4/4

2:00 pm-11:42 pm

1 stop14h 42m

$1,369

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 3/27

9:59 am-7:00 am

1 stop17h 01m

London Heathrow

Fri 4/3

11:00 am-6:44 pm

1 stop12h 44m

$1,469

IslipGlasgow

ISP - GLA

ISPGLA

Islip Long Island

Sun 3/29

9:59 am-8:05 am

2 stops17h 06m

Glasgow Intl

Sun 4/5

7:35 am-6:44 pm

2 stops16h 09m

$1,495

IslipManchester

ISP - MAN

ISPMAN

Islip Long Island

Fri 3/27

9:59 am-7:35 am

2 stops17h 36m

Manchester

Fri 4/3

8:55 pm-6:44 pm

2 stops26h 49m

$1,548

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/12

Showing 1-10 of 18 results
1
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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 July is currently the most expensive (average of $397). 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 Gatwick, Islip Long Island - Edinburgh Turnhouse or Islip Long Island - London Heathrow 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 July is currently the most expensive (average of $397). 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

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Alternative routes for Islip to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
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