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Cheap flights from Islip, New York to London from £361

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 18/6. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
16 Jun — 23 Jun1
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 17 May 2026.

Thu 11/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Wed 17/614:00
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 15/5£684
Fri 19/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Sun 28/614:00
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 14/5£750
Mon 29/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Mon 6/714:00
LGW
-
ISP
2 stops31h 47m
Multiple Airlines
Deal found 15/5£882
Mon 13/720:43
ISP
-
LGW
2 stops32h 17m
Multiple Airlines
Tue 21/714:00
LGW
-
ISP
1 stop24h 58m
Multiple Airlines
Deal found 14/5£901
Mon 29/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Sun 5/714:00
LGW
-
ISP
1 stop24h 58m
Multiple Airlines
Deal found 15/5£920
Mon 13/706:00
ISP
-
LHR
2 stops33h 45m
JetBlue
Tue 21/708:15
LHR
-
ISP
2 stops44h 02m
JetBlue
Deal found 14/5£1,084
Sun 17/507:25
ISP
-
LHR
2 stops18h 05m
Multiple Airlines
Sun 24/509:30
LHR
-
ISP
2 stops15h 15m
Multiple Airlines
Deal found 12/5£1,114
Thu 11/611:30
ISP
-
LHR
2 stops21h 00m
Multiple Airlines
Wed 17/608:50
LHR
-
ISP
2 stops30h 50m
Multiple Airlines
Deal found 14/5£1,114
Fri 19/615:07
ISP
-
LHR
2 stops48h 38m
JetBlue
Sun 28/608:40
LHR
-
ISP
2 stops58h 32m
JetBlue
Deal found 14/5£1,162
Fri 19/617:29
ISP
-
LHR
3 stops34h 06m
Multiple Airlines
Sun 28/606:50
LHR
-
ISP
3 stops19h 09m
Multiple Airlines
Deal found 14/5£1,234
Mon 29/621:52
ISP
-
LHR
2 stops27h 43m
Multiple Airlines
Mon 6/706:30
LHR
-
ISP
2 stops38h 26m
Multiple Airlines
Deal found 15/5£1,239

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 17 May 2026.

Round-trip from

£684

One-way from

£361

Popular in

June

Cheapest in

September

Average price

£529
11/6-17/6
  • 11/6-17/6
  • 2 total stops
  • 67h 05m total
  • Islip to London
Search Deals
18/6
  • 18/6
  • 1 total stop
  • 31h 08m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£49 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£7 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 17 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

Thu 11/6

21:52-10:00

1 stop31h 08m

London Gatwick

Wed 17/6

14:00-20:57

1 stop35h 57m

£747

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 29/6

21:52-10:00

1 stop31h 08m

London Gatwick

Mon 6/7

14:00-16:47

2 stops31h 47m

£882

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 26/6

21:52-10:00

1 stop31h 08m

London Gatwick

Fri 3/7

14:00-10:03

1 stop25h 03m

£883

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 13/7

20:43-10:00

2 stops32h 17m

London Gatwick

Tue 21/7

14:00-09:58

1 stop24h 58m

£901

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 10/6

14:55-11:45

2 stops15h 50m

London Gatwick

Wed 17/6

15:40-23:35

2 stops36h 55m

£1,097

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 11/6

11:30-18:55

2 stops26h 25m

London Heathrow

Wed 17/6

08:50-10:40

2 stops30h 50m

£1,115

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 29/6

21:52-06:35

2 stops27h 43m

London Heathrow

Mon 6/7

06:30-15:56

2 stops38h 26m

£1,239

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 13/7

10:00-07:10

1 stop16h 10m

London Heathrow

Tue 21/7

17:35-10:56

1 stop22h 21m

£1,364
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 27/6

09:00-08:35

1 stop18h 35m

London Heathrow

Mon 6/7

20:10-10:56

1 stop19h 46m

£1,372

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 19/6

12:20-09:35

2 stops16h 15m

London Gatwick

Sun 28/6

12:20-10:40

2 stops27h 20m

£1,394

Flights are sorted by cheapest return flights first.

Deals found on 13/5

Showing 1-10 of 19 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
Milton Keynes
Hounslow
Croydon
Wembley
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Ipswich
Southend-on-Sea
Guildford
Southall
Chelmsford

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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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