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Cheap flights from Islip, New York to London Heathrow Airport from £563

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
13 Sep — 20 Sep1
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
Explore the most affordable flight options available from Islip to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 August 2026.

Sun 8/1112:25 -
2 stops26h 05m
Tue 17/1112:15 -
2 stops14h 25m
Deal found 11/8£735
Wed 4/1112:30 -
2 stops26h 00m
Mon 9/1120:35 -
2 stops30h 05m
Deal found 12/8£736
Tue 29/915:20 -
2 stops24h 00m
Fri 30/1012:15 -
2 stops15h 20m
Deal found 9/8£740
Mon 21/916:05 -
2 stops23h 15m
Wed 14/1021:25 -
2 stops31h 10m
Deal found 10/8£741
Wed 9/915:20 -
2 stops24h 00m
Thu 17/921:25 -
2 stops29h 45m
Deal found 12/8£747
Sat 3/1012:20 -
2 stops18h 35m
Wed 21/1013:05 -
2 stops14h 30m
Deal found 10/8£772
Mon 19/1017:40 -
2 stops21h 40m
Fri 6/1120:35 -
2 stops30h 10m
Deal found 9/8£773
Thu 10/916:05 -
2 stops14h 50m
Thu 17/921:25 -
2 stops29h 45m
Deal found 11/8£774
Tue 8/915:20 -
2 stops24h 00m
Wed 28/1012:15 -
2 stops14h 20m
Deal found 12/8£780
Wed 4/1116:05 -
2 stops13h 45m
Sun 8/1120:35 -
2 stops31h 55m
Deal found 12/8£792
Wed 7/1012:50 -
2 stops18h 05m
Mon 12/1021:25 -
2 stops30h 10m
Deal found 9/8£799

Find flight deals from Islip to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 14 August 2026.

Round-trip from

£735

One-way from

£563

Popular in

June

Cheapest in

September

Average price

£529
8/11-17/11
  • 8/11-17/11
  • 4 total stops
  • 40h 30m total
  • Islip to London
Search Deals
6/10
  • 6/10
  • 2 total stops
  • 14h 35m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£98 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Islip to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 14 August 2026.
Use the filters below to find and compare flights from Islip to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 21/9

16:05-20:20

2 stops23h 15m

London Heathrow

Wed 14/10

21:25-23:35

2 stops31h 10m

£741

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 9/9

15:20-20:20

2 stops24h 00m

London Heathrow

Thu 17/9

21:25-22:10

2 stops29h 45m

£747
Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 2/11

12:25-10:50

2 stops17h 25m

London Heathrow

Sat 7/11

12:15-21:45

2 stops14h 30m

£772

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 8/9

15:20-20:20

2 stops24h 00m

London Heathrow

Wed 28/10

12:15-22:35

2 stops14h 20m

£780

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 4/11

16:05-10:50

2 stops13h 45m

London Heathrow

Sun 8/11

20:35-23:30

2 stops31h 55m

£792

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sat 9/1

11:20-19:30

2 stops27h 10m

London Heathrow

Sun 17/1

12:15-21:30

2 stops14h 15m

£809

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 14/1

15:50-19:30

2 stops22h 40m

London Heathrow

Sun 24/1

12:15-21:30

2 stops14h 15m

£809

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Fri 30/10

11:00-10:50

2 stops19h 50m

London Heathrow

Sun 8/11

20:35-23:30

2 stops31h 55m

£810

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 8/10

17:40-20:20

2 stops21h 40m

London Heathrow

Mon 12/10

21:25-22:35

2 stops30h 10m

£895

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sun 6/9

12:20-11:55

2 stops18h 35m

London Heathrow

Sun 13/9

21:25-22:10

2 stops29h 45m

£900

Flights are sorted by cheapest return flights first.

Deals found on 12/8

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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Islip to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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
Milton Keynes
Luton
Gatwick
Wembley
Ilford
Slough
Hayes
Croydon
Colchester
Brentford
Eastbourne
Northampton
Watford
Southend-on-Sea
Swindon
Enfield
Kingston upon Thames
Southall
Poole

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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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