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Cheap flights from Islip, New York to London from £600

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
23 Aug — 30 Aug1
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 24 July 2026.

Tue 18/810:57
ISP
-
LGW
1 stop18h 03m
Multiple Airlines
Mon 24/814:00
LGW
-
ISP
2 stops31h 47m
Multiple Airlines
Deal found 20/7£600
Sun 6/919:09
ISP
-
LGW
1 stop33h 51m
Multiple Airlines
Sun 13/914:00
LGW
-
ISP
2 stops50h 20m
Multiple Airlines
Deal found 23/7£620
Sat 5/919:09
ISP
-
LGW
1 stop33h 51m
Multiple Airlines
Sat 12/914:00
LGW
-
ISP
1 stop24h 33m
Multiple Airlines
Deal found 22/7£644
Fri 4/919:09
ISP
-
LGW
1 stop33h 51m
Multiple Airlines
Fri 11/914:00
LGW
-
ISP
1 stop24h 33m
Multiple Airlines
Deal found 21/7£693
Mon 28/916:05
ISP
-
LHR
2 stops23h 15m
Multiple Airlines
Mon 19/1021:25
LHR
-
ISP
2 stops30h 10m
Multiple Airlines
Deal found 20/7£745
Mon 28/916:05
ISP
-
LGW
2 stops17h 35m
Multiple Airlines
Mon 19/1015:40
LGW
-
ISP
2 stops35h 55m
Multiple Airlines
Deal found 20/7£745
Sat 5/906:00
ISP
-
LHR
2 stops22h 30m
JetBlue
Sat 12/908:15
LHR
-
ISP
2 stops20h 07m
JetBlue
Deal found 22/7£883
Fri 4/906:00
ISP
-
LHR
2 stops33h 45m
JetBlue
Fri 11/908:15
LHR
-
ISP
2 stops20h 07m
JetBlue
Deal found 21/7£893
Mon 7/906:00
ISP
-
LHR
2 stops33h 45m
JetBlue
Mon 14/908:40
LHR
-
ISP
2 stops19h 42m
JetBlue
Deal found 24/7£913
Mon 7/911:35
ISP
-
LHR
2 stops29h 05m
Multiple Airlines
Mon 14/907:40
LHR
-
ISP
2 stops36h 56m
Multiple Airlines
Deal found 24/7£1,052
Fri 4/909:05
ISP
-
LHR
2 stops30h 55m
Multiple Airlines
Fri 11/909:30
LHR
-
ISP
2 stops16h 29m
Multiple Airlines
Deal found 21/7£1,057
Tue 18/813:35
ISP
-
LHR
2 stops19h 20m
Multiple Airlines
Mon 24/808:50
LHR
-
ISP
2 stops20h 17m
Multiple Airlines
Deal found 20/7£1,088

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 24 July 2026.

Round-trip from

£600

Popular in

June

Cheapest in

September

Average price

£602
18/8-24/8
  • 18/8-24/8
  • 3 total stops
  • 49h 50m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£102 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 24 July 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

Tue 18/8

10:57-10:00

1 stop18h 03m

London Gatwick

Mon 24/8

14:00-16:47

2 stops31h 47m

£600

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 6/9

19:09-10:00

1 stop33h 51m

London Gatwick

Sun 13/9

14:00-11:20

2 stops50h 20m

£620

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 5/9

19:09-10:00

1 stop33h 51m

London Gatwick

Sat 12/9

14:00-09:33

1 stop24h 33m

£644

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 4/9

19:09-10:00

1 stop33h 51m

London Gatwick

Fri 11/9

14:00-09:33

1 stop24h 33m

£693

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 28/9

16:05-20:20

2 stops23h 15m

London Heathrow

Mon 19/10

21:25-22:35

2 stops30h 10m

£745

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 28/9

16:05-14:40

2 stops17h 35m

London Gatwick

Mon 19/10

15:40-22:35

2 stops35h 55m

£745

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 4/9

06:00-20:45

2 stops33h 45m

London Heathrow

Fri 11/9

08:15-23:22

2 stops20h 07m

£893

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 7/9

14:16-06:45

1 stop11h 29m

London Heathrow

Mon 14/9

08:50-09:33

2 stops29h 43m

£933
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 4/9

09:05-06:30

3 stops16h 25m

London Heathrow

Fri 11/9

09:30-20:59

2 stops16h 29m

£1,065

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 5/9

10:57-07:55

1 stop15h 58m

London Heathrow

Sat 12/9

13:40-09:33

1 stop24h 53m

£1,157

Flights are sorted by cheapest return flights first.

Deals found on 24/7

Showing 1-10 of 11 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.

  • How long is the flight from Islip, New York to London?

    A quick flight from Islip, New York to London can take about 33h 45m. JetBlue provides one of the quickest options available for as low as £893. The distance from Islip, New York to London is about 3406 mi.

  • 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
Hounslow
Milton Keynes
Luton
Wembley
Gatwick
Slough
Ilford
Hayes
Croydon
Colchester
Brentford
Eastbourne
Watford
Southend-on-Sea
Kingston upon Thames
Southall
Aylesbury
Dover
Romford
Enfield

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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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