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Cheap flights from Islip, New York to London from £391

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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
7 Mar — 14 Mar1
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 February 2026.

Mon 13/419:34
ISP
-
LGW
2 stops29h 46m
Multiple Airlines
Sun 19/414:00
LGW
-
ISP
1 stop24h 13m
Multiple Airlines
Deal found 4/2£787
Wed 18/311:50
ISP
-
LGW
2 stops42h 10m
Multiple Airlines
Wed 25/314:00
LGW
-
ISP
1 stop30h 13m
Multiple Airlines
Deal found 2/2£843
Mon 13/409:59
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sun 19/409:40
LHR
-
ISP
1 stop14h 04m
Multiple Airlines
Deal found 4/2£959
Fri 20/313:42
ISP
-
LGW
1 stop16h 18m
Multiple Airlines
Fri 27/311:40
LGW
-
ISP
2 stops35h 15m
Multiple Airlines
Deal found 3/2£961
Thu 19/309:59
ISP
-
LHR
1 stop16h 51m
Multiple Airlines
Thu 26/309:40
LHR
-
ISP
1 stop13h 04m
Multiple Airlines
Deal found 2/2£963
Mon 2/1112:30
ISP
-
LHR
1 stop13h 30m
Multiple Airlines
Mon 16/1113:10
LHR
-
ISP
1 stop11h 51m
Multiple Airlines
Deal found 2/2£964
Wed 18/309:59
ISP
-
LHR
1 stop17h 01m
Multiple Airlines
Wed 25/319:10
LHR
-
ISP
1 stop27h 34m
Multiple Airlines
Deal found 2/2£968
Fri 20/309:59
ISP
-
LHR
1 stop17h 01m
Multiple Airlines
Fri 27/319:10
LHR
-
ISP
1 stop27h 34m
Multiple Airlines
Deal found 3/2£1,053
Sun 22/309:59
ISP
-
LHR
1 stop17h 01m
Multiple Airlines
Sun 29/320:10
LHR
-
ISP
1 stop27h 34m
Multiple Airlines
Deal found 4/2£1,145
Sun 22/309:45
ISP
-
LGW
1 stop17h 45m
Multiple Airlines
Sun 29/314:30
LGW
-
ISP
1 stop23h 25m
Multiple Airlines
Deal found 4/2£5,120

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 February 2026.

Round-trip from

£787

One-way from

£391

Popular in

December

Cheapest in

September

Average price

£416
13/4-19/4
  • 13/4-19/4
  • 3 total stops
  • 53h 59m total
  • Islip to London
Search Deals
12/3
  • 12/3
  • 3 total stops
  • 59h 12m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£14 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
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 5 February 2026.
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

Mon 13/4

19:34-06:20

2 stops29h 46m

London Gatwick

Sun 19/4

14:00-09:13

1 stop24h 13m

£787

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 18/3

11:50-10:00

2 stops42h 10m

London Gatwick

Wed 25/3

14:00-16:13

1 stop30h 13m

£843

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 13/4

09:59-06:45

1 stop15h 46m

London Heathrow

Sun 19/4

09:40-18:44

1 stop14h 04m

£959

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 20/3

13:42-10:00

1 stop16h 18m

London Gatwick

Fri 27/3

11:40-18:55

2 stops35h 15m

£961

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 19/3

09:59-06:50

1 stop16h 51m

London Heathrow

Thu 26/3

09:40-18:44

1 stop13h 04m

£963

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 18/3

09:59-07:00

1 stop17h 01m

London Heathrow

Wed 25/3

19:10-18:44

1 stop27h 34m

£968

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 20/3

09:59-07:00

1 stop17h 01m

London Heathrow

Fri 27/3

19:10-18:44

1 stop27h 34m

£1,053

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 22/3

09:59-07:00

1 stop17h 01m

London Heathrow

Sun 29/3

20:10-18:44

1 stop27h 34m

£1,145

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 22/3

09:45-07:30

1 stop17h 45m

London Gatwick

Sun 29/3

14:30-08:55

1 stop23h 25m

£5,120

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 12/3

17:08-08:20

3 stops59h 12m

£391

Flights are sorted by cheapest return flights first.

Deals found on 1/2

Showing 1-10 of 12 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, April is the cheapest month in which you can book a flight from Islip, New York to London (average of £104). Flying from Islip, New York to London in June is currently the most expensive (average of £390). 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, April is the cheapest month in which you can book a flight from Islip, New York to London (average of £104). Flying from Islip, New York to London in June is currently the most expensive (average of £390). 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
Luton
Wembley
Gatwick
Slough
Ilford
Hounslow
Brentford
Hayes
Colchester
Watford
Guildford
Bedford
Chelmsford
Eastbourne
Crawley
Kingston upon Thames
Romford
Ipswich

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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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