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Cheap flights from Islip, New York to London from £238

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 21/7. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
19 Jul — 26 Jul1
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 19 June 2026.

Wed 29/710:57
ISP
-
LGW
1 stop18h 03m
Multiple Airlines
Wed 5/820:40
LGW
-
ISP
2 stops44h 50m
Multiple Airlines
Deal found 14/6£796
Thu 30/719:49
ISP
-
LGW
2 stops33h 11m
Multiple Airlines
Thu 6/814:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 15/6£897
Thu 23/719:49
ISP
-
LGW
2 stops33h 11m
Multiple Airlines
Tue 28/714:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 17/6£914
Thu 1/1014:00
ISP
-
LHR
2 stops49h 45m
JetBlue
Thu 8/1008:15
LHR
-
ISP
2 stops42h 20m
JetBlue
Deal found 15/6£934
Wed 29/710:00
ISP
-
LHR
2 stops29h 20m
Multiple Airlines
Wed 5/809:50
LHR
-
ISP
2 stops15h 25m
Multiple Airlines
Deal found 14/6£981
Thu 30/716:45
ISP
-
LHR
2 stops14h 10m
Multiple Airlines
Thu 6/808:50
LHR
-
ISP
2 stops16h 25m
Multiple Airlines
Deal found 15/6£1,008
Thu 1/1014:11
ISP
-
LHR
1 stop11h 59m
Multiple Airlines
Thu 8/1009:50
LHR
-
ISP
2 stops15h 25m
Multiple Airlines
Deal found 15/6£1,130
Sat 4/714:22
ISP
-
LHR
2 stops36h 43m
Multiple Airlines
Fri 10/707:40
LHR
-
ISP
2 stops21h 06m
Multiple Airlines
Deal found 15/6£1,169
Thu 16/711:31
ISP
-
LHR
2 stops21h 24m
Multiple Airlines
Wed 22/707:40
LHR
-
ISP
2 stops21h 06m
Multiple Airlines
Deal found 18/6£1,182
Thu 2/710:48
ISP
-
LGW
1 stop18h 12m
Multiple Airlines
Wed 8/715:40
LGW
-
ISP
2 stops24h 16m
Multiple Airlines
Deal found 17/6£1,217
Thu 16/716:45
ISP
-
LGW
1 stop11h 50m
Multiple Airlines
Wed 22/716:25
LGW
-
ISP
2 stops32h 50m
Multiple Airlines
Deal found 18/6£1,882

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 19 June 2026.

Round-trip from

£796

One-way from

£238

Popular in

June

Cheapest in

September

Average price

£645
29/7-5/8
  • 29/7-5/8
  • 3 total stops
  • 62h 53m total
  • Islip to London
Search Deals
21/7
  • 21/7
  • 3 total stops
  • 41h 04m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£80 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 June 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 19 June 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

Thu 30/7

19:49-10:00

2 stops33h 11m

London Gatwick

Thu 6/8

14:00-09:53

1 stop24h 53m

£897

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 23/7

19:49-10:00

2 stops33h 11m

London Gatwick

Tue 28/7

14:00-09:53

1 stop24h 53m

£914

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 1/10

14:00-20:45

2 stops49h 45m

London Heathrow

Thu 8/10

08:15-21:35

2 stops42h 20m

£934

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 29/7

10:00-20:20

2 stops29h 20m

London Heathrow

Wed 5/8

09:50-20:15

2 stops15h 25m

£981

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 30/7

16:45-11:55

2 stops14h 10m

London Heathrow

Thu 6/8

08:50-20:15

2 stops16h 25m

£1,008

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 1/10

14:11-07:10

1 stop11h 59m

London Heathrow

Thu 8/10

09:50-20:15

2 stops15h 25m

£1,130

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 16/7

11:31-13:55

2 stops21h 24m

London Heathrow

Wed 22/7

07:40-23:46

2 stops21h 06m

£1,182

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 29/7

10:00-08:25

2 stops17h 25m

London Gatwick

Wed 5/8

09:25-20:15

2 stops15h 50m

£1,311

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 2/7

16:45-14:40

2 stops16h 55m

London Gatwick

Wed 8/7

15:40-10:56

2 stops24h 16m

£1,344

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 23/7

11:31-15:00

2 stops22h 29m

London Heathrow

Tue 28/7

21:10-23:46

2 stops31h 36m

£1,349

Flights are sorted by cheapest return flights first.

Deals found on 15/6

Showing 1-10 of 16 resultsSorted by cheapest first
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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.

  • How long is the flight from Islip, New York to London?

    A quick flight from Islip, New York to London can take about 49h 45m. JetBlue provides one of the quickest options available for as low as £934. The distance from Islip, New York to London is about 3406 mi.

  • 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?

Book flights to London if you plan to visit one of these locations
Hounslow
Milton Keynes
Wembley
Luton
Gatwick
Croydon
Slough
Ilford
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Watford
Guildford
Romford
Ipswich
Borehamwood
Folkestone
Southall

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

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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