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Cheap flights from Islip, New York to London from £560

ISP — LON
26 Sep — 3 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

Sat 10/1018:25 -
1 stop34h 35m
Sat 17/1012:40 -
2 stops33h 50m
Deal found 26/8£601
Thu 8/1018:25 -
1 stop34h 35m
Thu 15/1014:00 -
1 stop33h 00m
Deal found 24/8£676
Tue 6/1016:20 -
2 stops17h 20m
Tue 13/1015:40 -
2 stops35h 55m
Deal found 22/8£730
Tue 6/1009:40 -
2 stops21h 15m
Tue 13/1021:25 -
2 stops30h 10m
Deal found 22/8£731
Wed 14/1009:40 -
2 stops21h 15m
Wed 21/1021:25 -
2 stops31h 10m
Deal found 26/8£731
Mon 28/916:05 -
2 stops14h 50m
Fri 2/1013:05 -
2 stops15h 30m
Deal found 22/8£735
Sat 19/911:55 -
2 stops19h 00m
Thu 24/921:25 -
2 stops29h 45m
Deal found 24/8£778
Tue 15/912:55 -
2 stops20h 45m
Sun 4/1015:40 -
2 stops36h 55m
Deal found 25/8£784
Tue 1/1216:05 -
2 stops13h 45m
Sun 21/220:35 -
2 stops31h 10m
Deal found 23/8£786
Wed 4/1112:30 -
2 stops17h 20m
Sun 8/1120:35 -
2 stops31h 55m
Deal found 26/8£787
Wed 21/1012:50 -
2 stops18h 05m
Tue 27/1020:35 -
2 stops30h 00m
Deal found 24/8£793
Wed 14/1009:40 -
2 stops24h 00m
Wed 21/1015:40 -
2 stops36h 55m
Deal found 26/8£793

Find flight deals from Islip to London

Round-trip from

£601

One-way from

£560

Popular in

June

Cheapest in

January

Average price

£549
10/10-17/10
  • 10/10-17/10
  • 3 total stops
  • 68h 25m total
  • Islip to London
Search Deals
30/9
  • 30/9
  • 2 total stops
  • 18h 00m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£92 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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

Thu 8/10

18:25-10:00

1 stop34h 35m

London Gatwick

Thu 15/10

14:00-18:00

1 stop33h 00m

£676

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Tue 6/10

16:20-14:40

2 stops17h 20m

London Gatwick

Tue 13/10

15:40-22:35

2 stops35h 55m

£730

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 6/10

09:40-11:55

2 stops21h 15m

London Heathrow

Tue 13/10

21:25-22:35

2 stops30h 10m

£731
Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 28/9

16:05-11:55

2 stops14h 50m

London Heathrow

Fri 2/10

13:05-23:35

2 stops15h 30m

£735

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sat 19/9

15:15-11:55

2 stops15h 40m

London Heathrow

Thu 24/9

21:25-22:10

2 stops29h 45m

£778

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 1/12

16:05-10:50

2 stops13h 45m

London Heathrow

Sun 21/2

20:35-22:45

2 stops31h 10m

£786

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 4/11

12:30-10:50

2 stops17h 20m

London Heathrow

Sun 8/11

20:35-23:30

2 stops31h 55m

£787

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Wed 14/10

09:40-14:40

2 stops24h 00m

London Gatwick

Wed 21/10

15:40-23:35

2 stops36h 55m

£793

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Sat 10/10

18:25-10:00

1 stop34h 35m

London Gatwick

Sat 17/10

14:00-17:30

1 stop32h 30m

£825

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 21/9

16:05-11:55

2 stops14h 50m

London Heathrow

Mon 19/10

21:25-22:35

2 stops30h 10m

£827

Flights are sorted by cheapest return flights first.

Deals found on 25/8

Showing 1-10 of 41 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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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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