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Cheap flights from London Heathrow Airport to Islip, New York from £1,172

LHR — ISP
18 Sep — 25 Sep1
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

Mon 31/809:50 -
2 stops29h 03m
Thu 3/910:57 -
1 stop13h 23m
Deal found 17/8£1,172
Tue 8/919:50 -
2 stops26h 51m
Tue 15/910:05 -
1 stop15h 25m
Deal found 18/8£1,752

Find flight deals from Heathrow to Islip

Round-trip from

£1,172

Popular in

July

Cheapest in

February

Average price

£548
31/8-3/9
  • 31/8-3/9
  • 3 total stops
  • 42h 26m total
  • London to Islip
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Highest demand for flights based on searches. 18% potential increase in price (£80 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
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Average for round-trip flights in August 2026
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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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Cheapest return flight

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Mon 31/8

09:50-09:53

2 stops29h 03m

Islip Long Island

Thu 3/9

10:57-05:20

1 stop13h 23m

£1,172
Fastest return journey

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Tue 8/9

19:50-17:41

2 stops26h 51m

Islip Long Island

Tue 15/9

10:05-06:30

1 stop15h 25m

£1,752

Flights are sorted by cheapest return flights first.

Deals found on 17/8

Sorted by cheapest first

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.

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Can Cheapflights find flights from Heathrow to Islip with no change fees?

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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