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Cheap flights from Islip, New York to London from £262

ISP — LON
5 Oct — 12 Oct1
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

Thu 15/1018:25 -
1 stop34h 35m
Thu 22/1014:00 -
1 stop33h 00m
Deal found 31/8£606
Tue 6/1016:20 -
2 stops17h 20m
Tue 13/1015:40 -
2 stops36h 00m
Deal found 4/9£734
Tue 6/1016:20 -
2 stops14h 35m
Tue 13/1021:25 -
2 stops30h 15m
Deal found 4/9£735
Thu 5/1112:25 -
2 stops26h 05m
Tue 10/1112:15 -
2 stops14h 25m
Deal found 31/8£771
Thu 15/1017:40 -
2 stops21h 40m
Thu 22/1021:25 -
2 stops31h 15m
Deal found 1/9£772
Fri 4/1216:05 -
2 stops13h 45m
Sun 13/1212:15 -
2 stops16h 15m
Deal found 31/8£808
Thu 1/1017:40 -
2 stops37h 15m
Thu 8/1013:05 -
2 stops15h 35m
Deal found 3/9£863
Thu 1/1015:10 -
2 stops39h 45m
Tue 13/1021:25 -
2 stops30h 15m
Deal found 2/9£864
Wed 9/910:55 -
2 stops19h 50m
Thu 17/915:40 -
2 stops35h 30m
Deal found 1/9£867
Thu 24/1212:30 -
2 stops17h 20m
Tue 29/1212:15 -
2 stops16h 30m
Deal found 31/8£873
Wed 30/910:55 -
2 stops28h 25m
Wed 7/1013:05 -
2 stops14h 35m
Deal found 31/8£884
Thu 1/1017:40 -
2 stops37h 15m
Tue 6/1021:25 -
2 stops30h 15m
Deal found 1/9£895

Find flight deals from Islip to London

Round-trip from

£606

One-way from

£262

Popular in

June

Cheapest in

January

Average price

£444
15/10-22/10
  • 15/10-22/10
  • 2 total stops
  • 67h 35m total
  • Islip to London
Search Deals
16/10-31/12
  • 16/10-31/12
  • 1 total stop
  • 34h 05m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£91 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 September 2026
Search Deals

Cheapflights Fare Finder

 
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

Fri 16/10

18:55-10:00

1 stop34h 05m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£262

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Sun 15/11

18:33-13:00

2 stops37h 27m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£277

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 11/11

12:30-10:50

2 stops17h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£564

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 30/9

15:20-20:20

2 stops24h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£564

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Wed 30/9

15:20-14:40

2 stops18h 20m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£564

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 1/10

17:40-14:40

2 stops16h 00m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£600
Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 1/10

17:40-11:55

2 stops13h 15m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£601

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sat 2/1

17:05-19:30

2 stops21h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£601

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Fri 2/10

11:00-14:40

2 stops22h 40m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£601

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 15/10

18:25-10:00

1 stop34h 35m

London Gatwick

Thu 22/10

14:00-18:00

1 stop33h 00m

£606

Flights are sorted by cheapest return flights first.

Deals found on 1/9

Showing 1-10 of 33 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

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

  • 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

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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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