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Cheap flights from Islip, New York to London Heathrow Airport from £573

ISP — LHR
12 Dec — 19 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Islip to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Islip to Heathrow

Tue 17/1116:05 -
2 stops13h 45m
Sun 22/1120:35 -
2 stops32h 00m
Deal found 11/11£783
Wed 9/1216:05 -
2 stops22h 25m
Mon 14/1220:35 -
2 stops30h 10m
Deal found 10/11£785
Wed 9/1212:30 -
2 stops26h 00m
Sun 13/1220:35 -
2 stops30h 10m
Deal found 10/11£823
Thu 3/1212:30 -
2 stops26h 00m
Sun 6/1212:15 -
2 stops16h 20m
Deal found 10/11£859
Mon 7/1212:30 -
2 stops26h 00m
Sun 13/1220:35 -
2 stops30h 10m
Deal found 10/11£862
Thu 10/1216:05 -
2 stops22h 25m
Thu 17/1220:35 -
2 stops32h 15m
Deal found 10/11£926
Fri 4/1216:05 -
2 stops13h 45m
Fri 11/1220:35 -
2 stops30h 10m
Deal found 8/11£932
Fri 13/1112:25 -
2 stops26h 05m
Fri 20/1120:35 -
2 stops32h 10m
Deal found 8/11£1,009
Fri 20/1112:25 -
2 stops26h 05m
Mon 23/1112:15 -
2 stops16h 20m
Deal found 7/11£1,312

Find flight deals from Islip to Heathrow

Round-trip from

£748

One-way from

£573

Popular in

June

Cheapest in

January

Average price

£597
13/1-18/1
  • 13/1-18/1
  • 4 total stops
  • 44h 25m total
  • Islip to London
Search Deals
16/2-31/12
  • 16/2-31/12
  • 2 total stops
  • 14h 25m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£61 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2026
Search Deals

Cheapflights Fare Finder

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

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Depart

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Price

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Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 10/2

15:25-10:50

2 stops14h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£573

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 16/2

15:25-10:50

2 stops14h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£573

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 18/11

16:05-19:30

2 stops22h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£573

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 13/1

15:25-10:50

2 stops14h 25m

London Heathrow

Mon 18/1

20:35-21:35

2 stops30h 00m

£748

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 27/1

12:30-19:30

2 stops26h 00m

London Heathrow

Mon 1/2

20:35-21:35

2 stops30h 00m

£748

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 17/3

09:50-10:50

2 stops21h 00m

London Heathrow

Wed 24/3

12:15-22:55

2 stops14h 40m

£748

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 8/3

10:45-10:50

2 stops19h 05m

London Heathrow

Wed 17/3

20:35-23:50

2 stops31h 15m

£749

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 2/3

15:25-19:30

2 stops23h 05m

London Heathrow

Mon 15/3

20:35-23:50

2 stops31h 15m

£749

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 9/12

16:05-19:30

2 stops22h 25m

London Heathrow

Mon 14/12

20:35-21:45

2 stops30h 10m

£785

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 2/3

12:30-19:30

2 stops26h 00m

London Heathrow

Sat 13/3

12:15-23:35

2 stops16h 20m

£786

Flights are sorted by cheapest return flights first.

Deals found on 9/11

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Best time to book a flight from Islip to Heathrow

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

Related info for your journey

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

    For a flight from Islip to London Heathrow, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Islip Long Island on a regular basis.

  • Can I find deals for flights from Islip to Heathrow that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to Heathrow 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 Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Luton
Wembley
Milton Keynes
Gatwick
Slough
Ilford
Hayes
Folkestone
Eastbourne
Croydon
Barnet
Northampton
Southall
Southend-on-Sea
Enfield
Brentford
Dover
Harrow
Watford

Browse thousands of different options on Cheapflights for your next trip

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How does Cheapflights help users find flights from Islip to Heathrow?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Islip to Heathrow. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Islip to Heathrow?

Cheapflights helps you find that perfect flight to Heathrow from Islip by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Yes! Cheapflights helps users easily find flights from Islip to Heathrow with no change fees.

Can Cheapflights notify me if prices for flights from Islip to Heathrow become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Heathrow from Islip today and book when prices fit your budget.

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