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$918+ Cheap flights from Islip, NY (ISP) to London (LON)

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
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Cheap flight deals from Islip to London

Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 23, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/22. 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 5/55:38 pm
ISP
-
LGW
1 stop35h 22m
Multiple Airlines
Tue 5/121:00 pm
LGW
-
ISP
2 stops26h 05m
Multiple Airlines
Deal found 3/22$918
This Kiwi.com deal was found by Cheapflights users on 3/20. 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.
Mon 5/44:07 pm
ISP
-
LGW
2 stops26h 48m
Multiple Airlines
Mon 5/112:00 pm
LGW
-
ISP
1 stop26h 00m
Multiple Airlines
Deal found 3/20$1,014
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 5/34:07 pm
ISP
-
LGW
2 stops17h 33m
Multiple Airlines
Sun 5/102:00 pm
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 3/18$1,110
This Expedia deal was found by Cheapflights users on 3/21. 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 5/56:40 pm
ISP
-
LHR
2 stops37h 50m
Multiple Airlines
Tue 5/127:40 am
LHR
-
ISP
2 stops39h 04m
Multiple Airlines
Deal found 3/21$1,239
This Expedia deal was found by Cheapflights users on 3/22. 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.
Wed 5/66:40 pm
ISP
-
LHR
2 stops41h 40m
Multiple Airlines
Wed 5/137:40 am
LHR
-
ISP
2 stops39h 04m
Multiple Airlines
Deal found 3/22$1,274
This Expedia deal was found by Cheapflights users on 3/18. 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 4/305:25 pm
ISP
-
LHR
2 stops40h 35m
Multiple Airlines
Mon 5/48:10 pm
LHR
-
ISP
2 stops49h 20m
Multiple Airlines
Deal found 3/18$1,286
This Expedia deal was found by Cheapflights users on 3/20. 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.
Mon 5/45:25 pm
ISP
-
LHR
2 stops47h 20m
Multiple Airlines
Mon 5/117:35 pm
LHR
-
ISP
2 stops49h 55m
Multiple Airlines
Deal found 3/20$1,287
This BusinessClass deal was found by Cheapflights users on 3/18. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/19:59 am
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Mon 5/49:40 am
LHR
-
ISP
1 stop30h 25m
Multiple Airlines
Deal found 3/18$1,437
This KAYAK deal was found by Cheapflights users on 3/18. 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.
Wed 8/199:59 am
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sun 8/239:40 am
LHR
-
ISP
1 stop15h 05m
Multiple Airlines
Deal found 3/18$1,481
This Icelandair deal was found by Cheapflights users on 3/18. 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 7/63:05 pm
ISP
-
LGW
2 stops15h 40m
Multiple Airlines
Tue 7/213:40 pm
LGW
-
ISP
2 stops35h 55m
Multiple Airlines
Deal found 3/18$1,482
This Icelandair deal was found by Cheapflights users on 3/18. 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 7/63:05 pm
ISP
-
LHR
2 stops15h 50m
Multiple Airlines
Tue 7/219:25 pm
LHR
-
ISP
2 stops30h 10m
Multiple Airlines
Deal found 3/18$1,483
This Ovago deal was found by Cheapflights users on 3/18. 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 5/39:59 am
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sun 5/109:40 am
LHR
-
ISP
1 stop11h 30m
Multiple Airlines
Deal found 3/18$1,491

Find flight deals from Islip to London

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$918
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$576
Provider with most accurate pricing for Islip Long Island-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-London (LON) flights.
Search Deals
From Islip Long Island to London (LON)
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($24 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 March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to London 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 March 23, 2026.
Use the filters below to find and compare flights from Islip to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Tue 5/5

5:38 pm-10:00 am

1 stop35h 22m

London Gatwick

Tue 5/12

1:00 pm-10:05 am

2 stops26h 05m

$918

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 5/4

4:07 pm-11:55 pm

2 stops26h 48m

London Gatwick

Mon 5/11

2:00 pm-11:00 am

1 stop26h 00m

$1,014

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 5/5

6:40 pm-1:30 pm

2 stops37h 50m

London Heathrow

Tue 5/12

7:40 am-5:44 pm

2 stops39h 04m

$1,239

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 5/6

6:40 pm-5:20 pm

2 stops41h 40m

London Heathrow

Wed 5/13

7:40 am-5:44 pm

2 stops39h 04m

$1,274

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 4/30

5:25 pm-3:00 pm

2 stops40h 35m

London Heathrow

Mon 5/4

8:10 pm-4:30 pm

2 stops49h 20m

$1,286

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 5/1

5:25 pm-12:40 pm

2 stops38h 15m

London Heathrow

Mon 5/4

8:10 pm-4:30 pm

2 stops49h 20m

$1,439

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 5/4

7:25 am-6:45 am

1 stop18h 20m

London Heathrow

Mon 5/11

9:40 am-4:10 pm

1 stop11h 30m

$1,464

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 8/19

9:59 am-6:45 am

1 stop15h 46m

London Heathrow

Sun 8/23

9:40 am-7:45 pm

1 stop15h 05m

$1,481

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 7/6

3:05 pm-11:45 am

2 stops15h 40m

London Gatwick

Tue 7/21

3:40 pm-10:35 pm

2 stops35h 55m

$1,482

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 7/6

3:05 pm-11:55 am

2 stops15h 50m

London Heathrow

Tue 7/21

9:25 pm-10:35 pm

2 stops30h 10m

$1,483

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/18

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Compare providers for flights from Islip to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to London in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Islip, New York-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Islip to London

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

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

Currently, November is the cheapest month in which you can book a flight from Islip, New York to London (average of $282). Flying from Islip, New York to London in June is currently the most expensive (average of $534). 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 London. 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 London?

    For a flight from Islip to London, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 outbound flights to London per day. 0 airlines have flights to London from Islip Long Island on a regular basis.

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

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

  • How can I find direct flights from Islip to London?

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

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

    Yes. Cheapflights offers flight deals from Islip to London 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 London?

    Currently, November is the cheapest month in which you can book a flight from Islip, New York to London (average of $282). Flying from Islip, New York to London in June is currently the most expensive (average of $534). 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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