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Cheap flights from Islip, New York to London from £561

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
13 Sep — 20 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 14 August 2026.

Thu 24/917:43 -
1 stop35h 17m
Thu 1/1014:00 -
1 stop31h 58m
Deal found 10/8£570
Mon 28/911:52 -
2 stops17h 08m
Mon 5/1014:00 -
1 stop31h 58m
Deal found 14/8£632
Sat 26/912:00 -
2 stops41h 00m
Sat 3/1014:00 -
1 stop31h 58m
Deal found 12/8£646
Thu 10/917:43 -
1 stop35h 17m
Wed 16/914:00 -
1 stop31h 58m
Deal found 11/8£668
Sun 8/1112:25 -
2 stops26h 05m
Tue 17/1112:15 -
2 stops14h 25m
Deal found 11/8£734
Wed 4/1112:30 -
2 stops26h 00m
Mon 9/1120:35 -
2 stops30h 05m
Deal found 12/8£734
Tue 29/915:20 -
2 stops24h 00m
Fri 30/1012:15 -
2 stops15h 20m
Deal found 9/8£738
Mon 21/916:05 -
2 stops23h 15m
Wed 14/1021:25 -
2 stops31h 10m
Deal found 10/8£739
Wed 9/915:20 -
2 stops15h 25m
Thu 17/915:40 -
2 stops35h 30m
Deal found 12/8£745
Wed 9/915:20 -
2 stops24h 00m
Thu 17/921:25 -
2 stops29h 45m
Deal found 12/8£745
Sat 3/1012:20 -
2 stops18h 35m
Wed 21/1013:05 -
2 stops14h 30m
Deal found 10/8£770
Sat 3/1015:50 -
2 stops17h 45m
Wed 21/1015:40 -
2 stops36h 55m
Deal found 10/8£770

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 14 August 2026.

Round-trip from

£570

One-way from

£561

Popular in

June

Cheapest in

September

Average price

£528
24/9-1/10
  • 24/9-1/10
  • 2 total stops
  • 67h 15m total
  • Islip to London
Search Deals
6/10
  • 6/10
  • 2 total stops
  • 14h 35m 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. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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 14 August 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 Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Mon 28/9

11:52-10:00

2 stops17h 08m

London Gatwick

Mon 5/10

14:00-16:58

1 stop31h 58m

£632

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 24/9

17:43-10:00

1 stop35h 17m

London Gatwick

Thu 1/10

14:00-14:22

2 stops29h 22m

£638

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 10/9

17:43-10:00

1 stop35h 17m

London Gatwick

Wed 16/9

14:00-16:58

1 stop31h 58m

£668

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 21/9

16:05-20:20

2 stops23h 15m

London Heathrow

Wed 14/10

21:25-23:35

2 stops31h 10m

£739

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Wed 9/9

15:20-11:45

2 stops15h 25m

London Gatwick

Thu 17/9

15:40-22:10

2 stops35h 30m

£745

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 9/9

15:20-20:20

2 stops24h 00m

London Heathrow

Thu 17/9

21:25-22:10

2 stops29h 45m

£745
Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 2/11

12:25-10:50

2 stops17h 25m

London Heathrow

Sat 7/11

12:15-21:45

2 stops14h 30m

£770

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 8/9

15:20-20:20

2 stops24h 00m

London Heathrow

Wed 28/10

12:15-22:35

2 stops14h 20m

£778

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 4/11

16:05-10:50

2 stops13h 45m

London Heathrow

Sun 8/11

20:35-23:30

2 stops31h 55m

£790

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sat 9/1

11:20-19:30

2 stops27h 10m

London Heathrow

Sun 17/1

12:15-21:30

2 stops14h 15m

£807

Flights are sorted by cheapest return flights first.

Deals found on 12/8

Showing 1-10 of 38 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.

  • 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
Ilford
Slough
Hayes
Croydon
Colchester
Brentford
Eastbourne
Watford
Southend-on-Sea
Enfield
Kingston upon Thames
Southall
Dover
Romford
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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