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Cheap flights from Islip, New York to London Heathrow Airport from £576

ISP — LHR
28 Oct — 4 Nov1
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

Mon 26/1017:40 -
2 stops13h 10m
Mon 2/1120:35 -
2 stops30h 05m
Deal found 26/9£747
Tue 27/1016:20 -
2 stops14h 30m
Mon 2/1120:35 -
2 stops30h 05m
Deal found 23/9£749
Wed 28/1016:20 -
2 stops14h 30m
Wed 4/1120:35 -
2 stops32h 00m
Deal found 23/9£768
Tue 20/1016:20 -
2 stops14h 35m
Sun 1/1112:15 -
2 stops16h 15m
Deal found 26/9£784
Fri 4/1216:05 -
2 stops13h 45m
Mon 7/1220:35 -
2 stops30h 05m
Deal found 26/9£785
Mon 26/1015:10 -
2 stops15h 40m
Sun 1/1120:35 -
2 stops31h 55m
Deal found 23/9£787
Fri 6/1112:25 -
2 stops26h 05m
Fri 13/1112:15 -
2 stops16h 20m
Deal found 23/9£805
Wed 28/1012:50 -
2 stops18h 00m
Sun 1/1120:35 -
2 stops31h 55m
Deal found 23/9£806
Fri 23/1011:00 -
2 stops19h 55m
Sun 1/1112:15 -
2 stops16h 15m
Deal found 26/9£822
Sat 24/1012:20 -
2 stops18h 30m
Sat 31/1020:35 -
2 stops31h 55m
Deal found 24/9£832

Find flight deals from Islip to Heathrow

Round-trip from

£747

One-way from

£576

Popular in

June

Cheapest in

January

Average price

£574
26/10-2/11
  • 26/10-2/11
  • 4 total stops
  • 43h 15m total
  • Islip to London
Search Deals
28/10-31/12
  • 28/10-31/12
  • 2 total stops
  • 18h 00m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£79 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 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 Heathrow Airport that are best for you.

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Route

Depart

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Price

Cheapest return flight

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 28/10

12:50-10:50

2 stops18h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£576

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 26/10

11:00-10:50

2 stops19h 50m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£576

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 19/10

15:10-20:20

2 stops24h 10m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£576

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Fri 1/1

12:30-10:50

2 stops17h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£614

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 5/11

12:25-10:50

2 stops17h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£614
Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sat 10/10

15:50-11:55

2 stops15h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£614

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Fri 23/10

15:10-11:55

2 stops15h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£614

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sun 25/10

17:45-19:30

2 stops21h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£699

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 26/10

11:00-10:50

2 stops19h 50m

London Heathrow

Mon 2/11

20:35-21:40

2 stops30h 05m

£748

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 3/2

11:20-10:50

2 stops18h 30m

London Heathrow

Mon 8/2

20:35-21:30

2 stops29h 55m

£750

Flights are sorted by cheapest return flights first.

Deals found on 27/9

Showing 1-10 of 22 resultsSorted by cheapest first
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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
Milton Keynes
Gatwick
Wembley
Slough
Ilford
Hayes
Croydon
Northampton
Colchester
Eastbourne
Enfield
Brentford
Southend-on-Sea
Barnet
Southall
Watford
Stratford-upon-Avon
Kingston upon Thames

Browse thousands of different options on Cheapflights for your next trip

Fly with Cheapflights

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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