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Cheap flights from Islip, New York to London from £231

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 18/7. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
28 Jun — 5 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 29 May 2026.

Fri 3/714:28
ISP
-
LGW
2 stops38h 32m
Multiple Airlines
Fri 10/714:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 24/5£721
Thu 11/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Sun 14/614:00
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 25/5£824
Thu 9/719:49
ISP
-
LGW
2 stops33h 11m
Multiple Airlines
Thu 16/714:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 24/5£856
Thu 11/611:30
ISP
-
LGW
2 stops41h 05m
JetBlue
Sun 14/612:20
LGW
-
ISP
2 stops30h 52m
JetBlue
Deal found 25/5£969
Thu 11/611:30
ISP
-
LHR
2 stops38h 00m
JetBlue
Sun 14/608:40
LHR
-
ISP
2 stops34h 32m
JetBlue
Deal found 25/5£1,046
Mon 8/610:00
ISP
-
LHR
2 stops29h 20m
Multiple Airlines
Mon 15/613:05
LHR
-
ISP
2 stops26h 51m
Multiple Airlines
Deal found 26/5£1,107
Sat 11/710:43
ISP
-
LGW
1 stop18h 17m
Multiple Airlines
Sat 18/721:15
LGW
-
ISP
2 stops42h 41m
Multiple Airlines
Deal found 29/5£1,122
Tue 2/609:59
ISP
-
LHR
2 stops29h 21m
Multiple Airlines
Tue 9/613:05
LHR
-
ISP
2 stops26h 51m
Multiple Airlines
Deal found 26/5£1,131
Mon 15/611:30
ISP
-
LHR
2 stops22h 30m
Multiple Airlines
Fri 10/707:40
LHR
-
ISP
2 stops30h 36m
Multiple Airlines
Deal found 25/5£1,144
Fri 3/711:30
ISP
-
LHR
2 stops23h 30m
Multiple Airlines
Fri 10/707:40
LHR
-
ISP
2 stops30h 36m
Multiple Airlines
Deal found 24/5£1,148
Sat 11/713:45
ISP
-
LHR
2 stops25h 35m
Multiple Airlines
Sat 18/708:50
LHR
-
ISP
2 stops30h 51m
Multiple Airlines
Deal found 29/5£1,166
Thu 9/711:31
ISP
-
LHR
2 stops21h 24m
Multiple Airlines
Thu 16/721:10
LHR
-
ISP
2 stops41h 06m
Multiple Airlines
Deal found 24/5£1,184

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 29 May 2026.

Round-trip from

£721

One-way from

£231

Popular in

June

Cheapest in

September

Average price

£543
3/7-10/7
  • 3/7-10/7
  • 3 total stops
  • 63h 25m total
  • Islip to London
Search Deals
18/7
  • 18/7
  • 2 total stops
  • 41h 03m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£54 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 29 May 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

Fri 3/7

14:28-10:00

2 stops38h 32m

London Gatwick

Fri 10/7

14:00-09:53

1 stop24h 53m

£736

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 11/6

21:52-10:00

1 stop31h 08m

London Gatwick

Sun 14/6

14:00-20:57

1 stop35h 57m

£824

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 9/7

19:49-10:00

2 stops33h 11m

London Gatwick

Thu 16/7

14:00-09:53

1 stop24h 53m

£856

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 11/6

11:30-09:35

2 stops41h 05m

London Gatwick

Sun 14/6

12:20-14:12

2 stops30h 52m

£969

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 3/7

11:30-16:00

2 stops23h 30m

London Heathrow

Fri 10/7

07:40-09:16

2 stops30h 36m

£1,148

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 11/7

13:45-20:20

2 stops25h 35m

London Heathrow

Sat 18/7

08:50-10:41

2 stops30h 51m

£1,166
Fastest return journey

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 11/7

15:05-14:35

2 stops18h 30m

London Gatwick

Sat 18/7

09:45-12:30

3 stops31h 45m

£1,385
Cheapest one-way

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 25/7

11:57-10:00

2 stops41h 03m

£250
Fastest single journey

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 18/7

10:43-10:00

1 stop18h 17m

£274

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 20/7

20:43-10:00

2 stops32h 17m

£296

Flights are sorted by cheapest return flights first.

Deals found on 26/5

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

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?

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

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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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