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Cheap flights from Islip, New York to London from £647

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 15/5. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
17 May — 24 May1
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 17 April 2026.

Sun 31/511:00
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Sun 7/614:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 16/4£765
Thu 28/511:00
ISP
-
LGW
2 stops39h 55m
Multiple Airlines
Thu 4/614:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 13/4£782
Fri 29/511:00
ISP
-
LGW
2 stops39h 55m
Multiple Airlines
Fri 5/614:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 14/4£792
Wed 22/411:50
ISP
-
LGW
2 stops17h 10m
Multiple Airlines
Wed 29/414:00
LGW
-
ISP
1 stop24h 33m
Multiple Airlines
Deal found 17/4£797
Mon 1/611:00
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Mon 8/614:00
LGW
-
ISP
1 stop30h 56m
Multiple Airlines
Deal found 16/4£800
Sat 30/511:00
ISP
-
LGW
2 stops18h 45m
Multiple Airlines
Sat 6/614:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 15/4£812
Fri 15/511:00
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Fri 22/514:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 15/4£837
Tue 16/616:41
ISP
-
LGW
1 stop36h 19m
Multiple Airlines
Sun 21/614:00
LGW
-
ISP
1 stop25h 03m
Multiple Airlines
Deal found 14/4£865
Fri 15/520:59
ISP
-
LHR
2 stops31h 31m
JetBlue
Fri 22/508:40
LHR
-
ISP
2 stops32h 52m
JetBlue
Deal found 15/4£990
Thu 14/518:40
ISP
-
LHR
2 stops37h 50m
Multiple Airlines
Sun 17/518:10
LHR
-
ISP
2 stops52h 34m
Multiple Airlines
Deal found 13/4£1,009
Thu 14/518:40
ISP
-
LHR
2 stops41h 40m
Multiple Airlines
Thu 21/507:40
LHR
-
ISP
2 stops34h 59m
Multiple Airlines
Deal found 13/4£1,022
Wed 22/417:25
ISP
-
LHR
2 stops22h 20m
JetBlue
Wed 29/408:15
LHR
-
ISP
2 stops37h 15m
JetBlue
Deal found 17/4£1,042

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 17 April 2026.

Round-trip from

£765

One-way from

£647

Popular in

December

Cheapest in

September

Average price

£460
31/5-7/6
  • 31/5-7/6
  • 2 total stops
  • 43h 05m total
  • Islip to London
Search Deals
15/5
  • 15/5
  • 2 total stops
  • 14h 25m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£9 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 17 April 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 return flight

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 31/5

11:00-10:00

1 stop18h 00m

London Gatwick

Sun 7/6

14:00-10:05

1 stop25h 05m

£765

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 28/5

11:00-07:55

2 stops39h 55m

London Gatwick

Thu 4/6

14:00-10:05

1 stop25h 05m

£782

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 29/5

11:00-07:55

2 stops39h 55m

London Gatwick

Fri 5/6

14:00-10:05

1 stop25h 05m

£792

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 1/6

11:00-10:00

1 stop18h 00m

London Gatwick

Mon 8/6

14:00-15:56

1 stop30h 56m

£800

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 30/5

11:00-10:45

2 stops18h 45m

London Gatwick

Sat 6/6

14:00-10:05

1 stop25h 05m

£812

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 15/5

11:00-10:00

1 stop18h 00m

London Gatwick

Fri 22/5

14:00-10:05

1 stop25h 05m

£837

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 14/5

18:40-13:30

2 stops37h 50m

London Heathrow

Sun 17/5

18:10-17:44

2 stops52h 34m

£1,009

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 14/5

18:40-17:20

2 stops41h 40m

London Heathrow

Thu 21/5

07:40-13:39

2 stops34h 59m

£1,022

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 28/5

14:35-15:00

2 stops19h 25m

London Heathrow

Thu 4/6

09:50-13:39

2 stops32h 49m

£1,063

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 29/5

14:35-17:20

2 stops21h 45m

London Heathrow

Fri 5/6

08:50-12:28

2 stops32h 38m

£1,064

Flights are sorted by cheapest return flights first.

Deals found on 15/4

Showing 1-10 of 19 resultsSorted by cheapest first
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
No data available for this route at this time. Please check back soon.

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.

See more FAQs

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Milton Keynes
Wembley
Croydon
Hounslow
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Romford
Eastbourne
Chelmsford
Ipswich
Southend-on-Sea
Guildford
Bishop's Stortford

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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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