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Cheap flights from Islip, New York to London from £232

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 27/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
22 Jan — 29 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Islip to London

Enter your travel dates to find the best prices.

Best flights from Islip to London
Discover carefully curated flight deals from Islip to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 December 2025.

Thu 5/219:43ISP - LGW
1 stop33h 17mMultiple Airlines
Thu 12/214:00LGW - ISP
1 stop22h 38mMultiple Airlines
Deal found 22/12£526
Thu 29/119:26ISP - LGW
2 stops33h 34mMultiple Airlines
Thu 12/214:00LGW - ISP
1 stop22h 38mMultiple Airlines
Deal found 23/12£535
Sun 18/119:58ISP - LGW
1 stop33h 02mMultiple Airlines
Wed 28/111:40LGW - ISP
2 stops36h 08mMultiple Airlines
Deal found 20/12£545
Fri 6/212:30ISP - LGW
2 stops17h 25mMultiple Airlines
Fri 13/214:00LGW - ISP
1 stop25h 46mMultiple Airlines
Deal found 23/12£815
Sun 18/109:59ISP - LHR
1 stop16h 01mMultiple Airlines
Wed 28/113:30LHR - ISP
1 stop11h 15mMultiple Airlines
Deal found 20/12£965
Thu 29/112:30ISP - LHR
1 stop13h 25mMultiple Airlines
Thu 12/206:00LHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 23/12£1,132
Fri 6/212:30ISP - LHR
2 stops17h 55mMultiple Airlines
Fri 13/209:20LHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 23/12£1,135
Thu 5/212:30ISP - LHR
1 stop13h 25mMultiple Airlines
Thu 12/219:55LHR - ISP
2 stops28h 50mMultiple Airlines
Deal found 22/12£1,199

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 23 December 2025.

Round-trip from

£526

One-way from

£232

Popular in

December

Cheapest in

January

Average price

£552
5/2-12/2
  • 5/2-12/2
  • 2 total stops
  • 55h 55m total
  • Islip to London
Search Deals
27/3
  • 27/3
  • 1 total stop
  • 16h 18m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£0 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 23 December 2025.
Use the filters below to find and compare flights from Islip to London that are best for you.

Fly from

Islip

Fly to

London

Route

Depart

Return

Price

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 5/2

19:43-10:00

1 stop33h 17m

London Gatwick

Thu 12/2

14:00-07:38

1 stop22h 38m

£526

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 29/1

19:26-10:00

2 stops33h 34m

London Gatwick

Thu 12/2

14:00-07:38

1 stop22h 38m

£535

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 18/1

19:58-10:00

1 stop33h 02m

London Gatwick

Wed 28/1

11:40-18:48

2 stops36h 08m

£545

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 6/2

12:30-10:55

2 stops17h 25m

London Gatwick

Fri 13/2

14:00-10:46

1 stop25h 46m

£815

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 18/1

09:59-07:00

1 stop16h 01m

London Heathrow

Wed 28/1

13:30-19:45

1 stop11h 15m

£965

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 29/1

12:30-06:55

1 stop13h 25m

London Heathrow

Thu 12/2

06:00-19:45

2 stops18h 45m

£1,132

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 6/2

12:30-11:25

2 stops17h 55m

London Heathrow

Fri 13/2

09:20-16:10

1 stop11h 50m

£1,135

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 5/2

12:30-06:55

1 stop13h 25m

London Heathrow

Thu 12/2

19:55-19:45

2 stops28h 50m

£1,199

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 27/3

13:42-10:00

1 stop16h 18m

£232

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 15/2

11:55-10:00

2 stops41h 05m

£237

Flights are sorted by cheapest return flights first.

Deals found on 21/12

Showing 1-10 of 11 results
1
2

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 return 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 £210). Flying from Islip, New York to London in June is currently the most expensive (average of £398). 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?

    Most people fly from Islip Long Island (ISP) if they book a flight from Islip to London. On average, Long Island has 0 outbound flights to London per day from 0 airlines. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.

  • 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 holiday 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 £210). Flying from Islip, New York to London in June is currently the most expensive (average of £398). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Milton Keynes
Croydon
Slough
Hounslow
Luton
Gatwick
Wembley
Ilford
Brentford
Colchester
Hayes
Watford
Crawley
Bedford
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Eastbourne
Ipswich
Bishop's Stortford
Chelmsford

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Islip to London?

Deals for Islip to London flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Islip to London?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Islip to London for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Islip to London with no change fees?

Certainly. Search results for flights to London from Islip shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Islip to London become cheaper?

Yes, Cheapflights offers price alerts on Islip to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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