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Cheap flights from Islip, New York to London from £378

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/1. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
4 Jan — 11 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Islip to London

Enter your travel dates to find the best prices.

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 5 December 2025.

Thu 4/1210:19ISP - LGW
2 stops38h 41mMultiple Airlines
Thu 11/1214:00LGW - ISP
1 stop34h 34mMultiple Airlines
Deal found 3/12£908
Thu 4/1210:19ISP - LGW
1 stop18h 41mMultiple Airlines
Wed 10/1211:40LGW - ISP
2 stops26h 33mMultiple Airlines
Deal found 3/12£1,358
Thu 4/1212:40ISP - LHR
1 stop13h 15mMultiple Airlines
Wed 10/1206:00LHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 3/12£1,551
Thu 4/1212:40ISP - LHR
2 stops25h 15mMultiple Airlines
Thu 11/1209:20LHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 3/12£1,871

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 5 December 2025.

Round-trip from

£378

Popular in

December

Cheapest in

January

Average price

£523
17/1-24/1
  • 17/1-24/1
  • 2 total stops
  • 44h 45m total
  • Islip to London
Search Deals
High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).
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Average for round-trip flights in December 2025
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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 5 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

Sat 17/1

08:00-10:05

1 stop21h 05m

London Gatwick

Sat 24/1

14:00-08:40

1 stop23h 40m

£378

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 16/1

20:54-10:05

1 stop32h 11m

London Gatwick

Fri 23/1

14:00-11:05

2 stops26h 05m

£582

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 19/1

10:00-22:00

2 stops31h 00m

London Heathrow

Mon 26/1

07:50-08:52

2 stops30h 02m

£779

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 17/1

10:00-15:35

2 stops24h 35m

London Heathrow

Sat 24/1

06:30-08:52

2 stops31h 22m

£905

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 16/1

12:30-17:30

2 stops24h 00m

London Heathrow

Fri 23/1

09:20-16:10

1 stop11h 50m

£1,192

Flights are sorted by cheapest return flights first.

Deals found on 3/12

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, March is the cheapest month in which you can book a flight from Islip, New York to London (average of £232). Flying from Islip, New York to London in June is currently the most expensive (average of £400). 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, March is the cheapest month in which you can book a flight from Islip, New York to London (average of £232). Flying from Islip, New York to London in June is currently the most expensive (average of £400). 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
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Gatwick
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Ilford
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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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