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Cheap flights from London Heathrow Airport to Islip, New York from £745

LHR — ISP
18 Nov — 25 Nov1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Islip

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Islip

Tue 1/1220:35 -
2 stops30h 10m
Tue 8/1212:30 -
2 stops17h 20m
Deal found 17/10£759
Fri 13/1112:15 -
2 stops16h 20m
Wed 18/1116:05 -
2 stops22h 25m
Deal found 14/10£797
Sat 7/1112:15 -
2 stops14h 35m
Sat 14/1112:45 -
2 stops17h 05m
Deal found 16/10£929
Sat 28/1112:15 -
2 stops16h 30m
Sat 5/1212:45 -
2 stops17h 05m
Deal found 14/10£1,326
Sat 21/1120:35 -
2 stops32h 00m
Tue 24/1116:55 -
2 stops21h 35m
Deal found 17/10£1,452
Wed 4/1112:15 -
2 stops14h 30m
Sat 7/1115:30 -
2 stops14h 20m
Deal found 17/10£1,522
Mon 23/1112:15 -
2 stops16h 20m
Sun 29/1113:35 -
2 stops16h 15m
Deal found 19/10£1,808
Fri 23/1013:05 -
2 stops15h 35m
Fri 13/1112:25 -
2 stops17h 25m
Deal found 19/10£2,135
Mon 19/1013:05 -
2 stops15h 35m
Thu 22/1015:10 -
2 stops15h 45m
Deal found 16/10£2,587
Sun 18/1021:25 -
2 stops31h 15m
Thu 22/1017:40 -
2 stops13h 15m
Deal found 17/10£2,600

Find flight deals from Heathrow to Islip

Round-trip from

£759

One-way from

£745

Popular in

July

Cheapest in

February

Average price

£488
1/12-8/12
  • 1/12-8/12
  • 4 total stops
  • 47h 30m total
  • London to Islip
Search Deals
17/11-31/12
  • 17/11-31/12
  • 2 total stops
  • 14h 30m total
  • London to Islip
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£71 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from London Heathrow Airport to Islip that are best for you.

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Depart

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Price

Cheapest return flight

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Tue 17/11

12:15-21:45

2 stops14h 30m

Islip Long Island

Wed 31/12

00:00-06:00

Nonstop0h 00m

£745

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Sat 20/2

20:35-23:50

2 stops32h 15m

Islip Long Island

Wed 31/12

00:00-06:00

Nonstop0h 00m

£754

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Mon 18/1

20:35-21:30

2 stops29h 55m

Islip Long Island

Fri 22/1

11:20-19:30

2 stops27h 10m

£761

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Thu 5/11

20:35-23:35

2 stops32h 00m

Islip Long Island

Wed 31/12

00:00-06:00

Nonstop0h 00m

£789

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Fri 12/3

12:15-23:50

2 stops16h 35m

Islip Long Island

Tue 16/3

17:20-10:50

2 stops13h 30m

£793

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Mon 11/1

20:35-21:30

2 stops29h 55m

Islip Long Island

Mon 18/1

16:30-19:30

2 stops22h 00m

£797

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Fri 13/11

12:15-23:35

2 stops16h 20m

Islip Long Island

Wed 18/11

16:05-19:30

2 stops22h 25m

£797

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Sun 8/11

12:15-23:35

2 stops16h 20m

Islip Long Island

Wed 31/12

00:00-06:00

Nonstop0h 00m

£811

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Fri 20/11

20:35-23:45

2 stops32h 10m

Islip Long Island

Wed 31/12

00:00-06:00

Nonstop0h 00m

£926

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Sat 7/11

12:15-21:50

2 stops14h 35m

Islip Long Island

Sat 14/11

12:45-10:50

2 stops17h 05m

£929

Flights are sorted by cheapest return flights first.

Deals found on 18/10

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Best time to book a flight from Heathrow to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Heathrow with our price prediction graph.
Estimated return price

Related info for your journey

  • What airport do you fly into for flights to Islip from London Heathrow?

    Most people fly into Islip Long Island (ISP) if they book a flight to Islip from London Heathrow. On average, Long Island has 0 inbound flights from London Heathrow 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 Heathrow to Islip that include hotel bookings?

    Yes. In addition to deals on Heathrow to Islip flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Islip?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Islip.

  • Can I find deals for business class flights from Heathrow to Islip?

    Yes. Cheapflights offers flight deals from Heathrow to Islip 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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Need flexible booking options for your flight to Islip from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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