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$699+ 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 2/22. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
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Cheap 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 January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$699
(Trip.com)

One-way from

$434
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$570
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
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One-way flight from Islip Long Island to United Kingdom
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Highest demand for flights based on searches. 4% potential increase in price ($29 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 January 8, 2026.

This Trip.com deal was found by Cheapflights users on 1/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/228:33 amISP - LHR
2 stops21h 17mMultiple Airlines
Sun 3/112:15 pmLHR - ISP
2 stops31h 24mMultiple Airlines
Deal found 1/8$699
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/203:34 pmISP - LGW
1 stop13h 26mMultiple Airlines
Fri 2/272:00 pmLGW - ISP
1 stop26h 06mMultiple Airlines
Deal found 1/8$797
This Expedia deal was found by Cheapflights users on 1/7. 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.
Tue 1/2010:00 amISP - LHR
2 stops20h 25mMultiple Airlines
Sun 1/255:45 pmLHR - ISP
2 stops44h 07mMultiple Airlines
Deal found 1/7$1,096
This Ovago deal was found by Cheapflights users on 1/7. 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.
Wed 1/149:59 amISP - LHR
1 stop16h 01mMultiple Airlines
Wed 1/217:10 pmLHR - ISP
1 stop20h 55mMultiple Airlines
Deal found 1/7$1,228
This Ovago deal was found by Cheapflights users on 1/8. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/229:59 amISP - GLA
2 stops16h 51mMultiple Airlines
Sun 3/110:20 amGLA - ISP
2 stops14h 25mMultiple Airlines
Deal found 1/8$1,312
This Expedia deal was found by Cheapflights users on 1/7. 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 1/810:00 amISP - LHR
2 stops20h 25mMultiple Airlines
Thu 1/159:50 amLHR - ISP
2 stops28h 02mMultiple Airlines
Deal found 1/7$1,389
This Expedia deal was found by Cheapflights users on 1/6. 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.
Tue 2/179:29 amISP - LHR
2 stops28h 51mMultiple Airlines
Tue 2/248:50 amLHR - ISP
2 stops28h 57mMultiple Airlines
Deal found 1/6$1,451
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/209:59 amISP - LHR
2 stops20h 26mMultiple Airlines
Fri 2/279:20 amLHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 1/8$1,712
This Mytrip deal was found by Cheapflights users on 1/7. 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 1/89:59 amISP - LGW
2 stops24h 51mMultiple Airlines
Thu 1/158:50 amLGW - ISP
2 stops15h 55mMultiple Airlines
Deal found 1/7$1,751
This Trip.com deal was found by Cheapflights users on 1/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/228:33 amISP - LGW
1 stop17h 57mMultiple Airlines
Sun 3/111:20 amLGW - ISP
1 stop32h 19mMultiple Airlines
Deal found 1/8$2,688
This AranGrant deal was found by Cheapflights users on 1/8. 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 AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/229:59 amISP - EDI
2 stops17h 51mMultiple Airlines
Sun 3/18:20 pmEDI - ISP
2 stops28h 25mMultiple Airlines
Deal found 1/8$4,201
This KAYAK deal was found by Cheapflights users on 1/7. 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.
Tue 10/2712:30 pmISP - GLA
2 stops17h 20mMultiple Airlines
Thu 11/56:35 amGLA - ISP
2 stops18h 26mMultiple Airlines
Deal found 1/7$5,710

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 January 8, 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 - LHR

ISPLHR

Islip Long Island

Sun 2/22

8:33 am-10:50 am

2 stops21h 17m

London Heathrow

Sun 3/1

12:15 pm-2:39 pm

2 stops31h 24m

$699

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 2/20

3:34 pm-10:00 am

1 stop13h 26m

London Gatwick

Fri 2/27

2:00 pm-11:06 am

1 stop26h 06m

$797

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 1/20

10:00 am-11:25 am

2 stops20h 25m

London Heathrow

Sun 1/25

5:45 pm-8:52 am

2 stops44h 07m

$1,096

IslipGlasgow

ISP - GLA

ISPGLA

Islip Long Island

Sun 2/22

9:59 am-7:50 am

2 stops16h 51m

Glasgow Intl

Sun 3/1

10:20 am-7:45 pm

2 stops14h 25m

$1,312

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 2/17

9:29 am-7:20 pm

2 stops28h 51m

London Heathrow

Tue 2/24

8:50 am-8:47 am

2 stops28h 57m

$1,451

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 2/20

9:59 am-11:25 am

2 stops20h 26m

London Heathrow

Fri 2/27

9:20 am-4:10 pm

1 stop11h 50m

$1,712

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 2/22

8:33 am-7:30 am

1 stop17h 57m

London Gatwick

Sun 3/1

11:20 am-2:39 pm

1 stop32h 19m

$2,688

IslipEdinburgh

ISP - EDI

ISPEDI

Islip Long Island

Sun 2/22

9:59 am-8:50 am

2 stops17h 51m

Edinburgh Turnhouse

Sun 3/1

8:20 pm-7:45 pm

2 stops28h 25m

$4,201

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Tue 1/20

10:00 am-7:30 am

1 stop16h 30m

London Gatwick

Sun 1/25

11:20 am-8:52 am

1 stop26h 32m

$6,566

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

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 $403). 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 - Glasgow 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 July is currently the most expensive (average of $403). 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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