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Cheap flights from Islip, New York to London from £488

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 16/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
27 Aug — 3 Sep1
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 28 July 2026.

Mon 7/910:57
ISP
-
LGW
1 stop18h 03m
Multiple Airlines
Mon 14/914:00
LGW
-
ISP
1 stop31h 58m
Multiple Airlines
Deal found 26/7£558
Fri 11/917:43
ISP
-
LGW
1 stop35h 17m
Multiple Airlines
Fri 18/914:00
LGW
-
ISP
1 stop31h 58m
Multiple Airlines
Deal found 28/7£574
Sat 29/819:09
ISP
-
LGW
1 stop33h 51m
Multiple Airlines
Sat 5/914:00
LGW
-
ISP
1 stop33h 14m
Multiple Airlines
Deal found 27/7£618
Wed 7/1012:50
ISP
-
LHR
2 stops18h 05m
Multiple Airlines
Wed 14/1013:05
LHR
-
ISP
2 stops14h 30m
Multiple Airlines
Deal found 27/7£744
Wed 7/1009:40
ISP
-
LHR
2 stops21h 15m
Multiple Airlines
Mon 12/1021:25
LHR
-
ISP
2 stops30h 10m
Multiple Airlines
Deal found 28/7£764
Thu 15/1017:40
ISP
-
LHR
2 stops21h 40m
Multiple Airlines
Tue 20/1013:05
LHR
-
ISP
2 stops14h 30m
Multiple Airlines
Deal found 28/7£782
Thu 15/1017:40
ISP
-
LGW
2 stops16h 00m
Multiple Airlines
Tue 20/1015:40
LGW
-
ISP
2 stops35h 55m
Multiple Airlines
Deal found 28/7£782
Tue 8/906:00
ISP
-
LHR
2 stops22h 30m
JetBlue
Tue 15/908:15
LHR
-
ISP
2 stops36h 21m
JetBlue
Deal found 25/7£790
Sun 6/1212:25
ISP
-
LGW
2 stops17h 30m
Multiple Airlines
Sun 13/1211:55
LGW
-
ISP
2 stops16h 35m
Multiple Airlines
Deal found 28/7£821
Sun 6/1212:25
ISP
-
LHR
2 stops26h 05m
Multiple Airlines
Sun 13/1220:35
LHR
-
ISP
2 stops30h 05m
Multiple Airlines
Deal found 28/7£823
Wed 26/810:55
ISP
-
LHR
2 stops20h 00m
Multiple Airlines
Wed 2/921:25
LHR
-
ISP
2 stops29h 45m
Multiple Airlines
Deal found 27/7£839
Fri 25/910:20
ISP
-
LHR
2 stops29h 00m
Multiple Airlines
Fri 2/1013:05
LHR
-
ISP
2 stops15h 30m
Multiple Airlines
Deal found 28/7£851

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 28 July 2026.

Round-trip from

£558

One-way from

£488

Popular in

June

Cheapest in

September

Average price

£621
7/9-14/9
  • 7/9-14/9
  • 2 total stops
  • 50h 01m total
  • Islip to London
Search Deals
16/8
  • 16/8
  • 2 total stops
  • 21h 46m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£103 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% 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 28 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

Mon 7/9

10:57-10:00

1 stop18h 03m

London Gatwick

Mon 14/9

14:00-16:58

1 stop31h 58m

£558

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 24/1

15:50-19:30

2 stops22h 40m

London Heathrow

Sun 31/1

12:15-22:45

2 stops15h 30m

£782

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 8/9

06:00-09:30

2 stops22h 30m

London Heathrow

Tue 15/9

08:15-15:36

2 stops36h 21m

£790
Fastest return journey

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 24/1

15:50-10:55

2 stops14h 05m

London Gatwick

Sun 31/1

11:55-22:45

2 stops15h 50m

£800

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 7/1

15:50-19:30

2 stops22h 40m

London Heathrow

Sun 10/1

20:35-21:30

2 stops29h 55m

£821

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 6/12

12:25-10:55

2 stops17h 30m

London Gatwick

Sun 13/12

11:55-23:30

2 stops16h 35m

£821

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 6/12

12:25-19:30

2 stops26h 05m

London Heathrow

Sun 13/12

20:35-21:40

2 stops30h 05m

£823

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 26/8

10:55-11:55

2 stops20h 00m

London Heathrow

Wed 2/9

21:25-22:10

2 stops29h 45m

£839

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 25/9

10:20-20:20

2 stops29h 00m

London Heathrow

Fri 2/10

13:05-23:35

2 stops15h 30m

£851

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 25/9

16:05-11:55

2 stops14h 50m

London Heathrow

Thu 1/10

13:05-23:35

2 stops15h 30m

£851

Flights are sorted by cheapest return flights first.

Deals found on 26/7

Showing 1-10 of 37 resultsSorted by cheapest first
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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 £790. 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
Hayes
Croydon
Colchester
Brentford
Eastbourne
Watford
Southend-on-Sea
Enfield
Kingston upon Thames
Southall
Aylesbury
Dover
Romford

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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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