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Cheap flights from Islip, New York to London from £426

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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
16 Aug — 23 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 17 July 2026.

Wed 19/811:57
ISP
-
LGW
2 stops41h 03m
Multiple Airlines
Wed 26/814:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 13/7£537
Tue 11/817:27
ISP
-
LGW
2 stops35h 33m
Multiple Airlines
Sat 22/814:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 15/7£668
Wed 12/810:57
ISP
-
LGW
1 stop18h 03m
Multiple Airlines
Wed 19/814:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 15/7£675
Mon 31/819:09
ISP
-
LGW
1 stop33h 51m
Multiple Airlines
Mon 7/914:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 17/7£761
Wed 12/816:45
ISP
-
LGW
2 stops35h 50m
JetBlue
Wed 19/812:20
LGW
-
ISP
2 stops38h 29m
JetBlue
Deal found 15/7£863
Wed 12/806:00
ISP
-
LHR
2 stops22h 30m
JetBlue
Wed 19/808:40
LHR
-
ISP
2 stops19h 48m
JetBlue
Deal found 15/7£870
Tue 11/806:00
ISP
-
LGW
2 stops22h 35m
JetBlue
Sat 22/812:20
LGW
-
ISP
2 stops25h 45m
JetBlue
Deal found 15/7£882
Tue 11/813:35
ISP
-
LHR
2 stops26h 10m
JetBlue
Sat 22/808:15
LHR
-
ISP
2 stops29h 50m
JetBlue
Deal found 15/7£895
Sun 30/816:58
ISP
-
LHR
2 stops32h 32m
JetBlue
Sun 6/911:55
LHR
-
ISP
2 stops38h 39m
JetBlue
Deal found 16/7£946
Wed 19/810:05
ISP
-
LHR
2 stops29h 55m
Multiple Airlines
Wed 26/809:30
LHR
-
ISP
2 stops30h 26m
Multiple Airlines
Deal found 16/7£1,020
Tue 11/810:05
ISP
-
LHR
2 stops29h 55m
Multiple Airlines
Sat 22/807:40
LHR
-
ISP
3 stops33h 50m
Multiple Airlines
Deal found 15/7£1,103
Sun 30/809:05
ISP
-
LHR
2 stops18h 00m
Multiple Airlines
Sun 6/908:30
LHR
-
ISP
3 stops31h 26m
Multiple Airlines
Deal found 16/7£1,134

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 July 2026.

Round-trip from

£537

One-way from

£426

Popular in

June

Cheapest in

September

Average price

£573
19/8-26/8
  • 19/8-26/8
  • 3 total stops
  • 65h 56m total
  • Islip to London
Search Deals
27/8
  • 27/8
  • 1 total stop
  • 33h 51m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£97 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 17 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

Wed 19/8

11:57-10:00

2 stops41h 03m

London Gatwick

Wed 26/8

14:00-09:53

1 stop24h 53m

£537

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Tue 11/8

17:27-10:00

2 stops35h 33m

London Gatwick

Sat 22/8

14:00-09:53

1 stop24h 53m

£668

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 12/8

10:57-10:00

1 stop18h 03m

London Gatwick

Wed 19/8

14:00-09:53

1 stop24h 53m

£675

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 31/8

19:09-10:00

1 stop33h 51m

London Gatwick

Mon 7/9

14:00-09:53

1 stop24h 53m

£761
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 12/8

06:00-09:30

2 stops22h 30m

London Heathrow

Wed 19/8

08:40-23:28

2 stops19h 48m

£870

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 30/8

16:58-06:30

2 stops32h 32m

London Heathrow

Sun 6/9

11:55-21:34

2 stops38h 39m

£946

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 19/8

14:16-21:00

2 stops25h 44m

London Heathrow

Wed 26/8

13:05-10:56

2 stops26h 51m

£1,034

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 11/8

10:05-21:00

2 stops29h 55m

London Heathrow

Sat 22/8

07:40-12:30

3 stops33h 50m

£1,103

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 30/8

09:05-08:05

2 stops18h 00m

London Heathrow

Sun 6/9

08:30-10:56

3 stops31h 26m

£1,134
Cheapest one-way
Fastest single journey

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 27/8

19:09-10:00

1 stop33h 51m

£426

Flights are sorted by cheapest return flights first.

Deals found on 13/7

Sorted by cheapest first

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 22h 30m. JetBlue provides one of the quickest options available for as low as £870. 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
Gatwick
Wembley
Slough
Ilford
Croydon
Hayes
Brentford
Colchester
Watford
Eastbourne
Southend-on-Sea
Kingston upon Thames
Southall
Aylesbury
Romford
Enfield
Borehamwood

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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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