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Cheap flights from Islip, New York to London from £541

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
9 Aug — 16 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Islip to London

Enter your travel dates to find the best prices.

Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 July 2026.

Wed 19/810:57
ISP
-
LGW
1 stop18h 03m
Multiple Airlines
Wed 26/814:00
LGW
-
ISP
1 stop33h 14m
Multiple Airlines
Deal found 7/7£541
Wed 26/810:57
ISP
-
LGW
1 stop18h 03m
Multiple Airlines
Mon 31/814:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 6/7£553
Wed 26/816:45
ISP
-
LGW
2 stops35h 50m
JetBlue
Mon 31/812:20
LGW
-
ISP
2 stops51h 23m
JetBlue
Deal found 6/7£830
Wed 26/816:45
ISP
-
LHR
2 stops23h 00m
JetBlue
Mon 31/808:40
LHR
-
ISP
2 stops42h 09m
JetBlue
Deal found 6/7£858
Fri 10/714:28
ISP
-
LGW
2 stops38h 32m
Multiple Airlines
Fri 17/714:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 9/7£964
Wed 19/814:16
ISP
-
LHR
2 stops14h 44m
Multiple Airlines
Wed 26/809:50
LHR
-
ISP
2 stops15h 25m
Multiple Airlines
Deal found 6/7£1,020
Fri 10/706:00
ISP
-
LGW
2 stops46h 35m
JetBlue
Fri 17/712:20
LGW
-
ISP
2 stops25h 56m
JetBlue
Deal found 9/7£1,080
Thu 3/916:50
ISP
-
LHR
1 stop10h 10m
Multiple Airlines
Sun 6/909:50
LHR
-
ISP
2 stops16h 09m
Multiple Airlines
Deal found 7/7£1,114
Fri 18/917:34
ISP
-
LHR
1 stop11h 01m
Multiple Airlines
Mon 28/909:50
LHR
-
ISP
2 stops15h 25m
Multiple Airlines
Deal found 8/7£1,118
Wed 26/814:16
ISP
-
LHR
1 stop11h 54m
Multiple Airlines
Mon 31/820:10
LHR
-
ISP
1 stop19h 46m
Multiple Airlines
Deal found 6/7£1,140

Find flight deals from Islip to London

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to London (LON). 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 10 July 2026.

Round-trip from

£541

Popular in

June

Cheapest in

September

Average price

£547
19/8-26/8
  • 19/8-26/8
  • 2 total stops
  • 51h 17m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£93 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£15 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Islip to London 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 10 July 2026.
Use the filters below to find and compare flights from Islip to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 19/8

10:57-10:00

1 stop18h 03m

London Gatwick

Wed 26/8

14:00-18:14

1 stop33h 14m

£541

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 26/8

10:57-10:00

1 stop18h 03m

London Gatwick

Mon 31/8

14:00-09:53

1 stop24h 53m

£553

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 20/8

19:09-10:00

1 stop33h 51m

London Gatwick

Wed 26/8

14:00-18:14

1 stop33h 14m

£565

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 19/8

14:16-06:45

1 stop11h 29m

London Heathrow

Wed 26/8

20:50-12:30

2 stops44h 40m

£982

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 20/8

11:35-13:55

2 stops21h 20m

London Heathrow

Wed 26/8

09:50-23:28

2 stops18h 38m

£1,036
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 18/9

17:34-09:35

1 stop11h 01m

London Heathrow

Mon 28/9

09:50-20:15

2 stops15h 25m

£1,118
Cheapest one-way
Fastest single journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 15/8

15:10-15:35

2 stops19h 25m

£1,487

Flights are sorted by cheapest return flights first.

Deals found on 7/7

Sorted by cheapest first

Best time to book a flight from Islip to London

Have a flexible travel schedule? Discover the best time to fly to London 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.

Cheapflights Insights

Everything you need to know about your flight from Islip to London
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Islip to London. 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?

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to London 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?

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Deals for Islip to London flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Islip to London for you. Better yet — we are completely free to use.

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

Certainly. Search results for flights to London from Islip shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on Islip to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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