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Cheap flights from Islip, New York to London from £398

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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
12 Jul — 19 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 12 June 2026.

Sat 4/711:57
ISP
-
LGW
2 stops41h 03m
Multiple Airlines
Fri 10/714:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 11/6£665
Sat 22/811:55
ISP
-
LGW
2 stops18h 50m
Multiple Airlines
Sun 30/815:40
LGW
-
ISP
2 stops35h 25m
Multiple Airlines
Deal found 10/6£826
Sat 22/815:15
ISP
-
LHR
2 stops15h 40m
Multiple Airlines
Sun 30/821:25
LHR
-
ISP
2 stops29h 40m
Multiple Airlines
Deal found 10/6£866
Mon 2/1113:55
ISP
-
LHR
2 stops49h 50m
JetBlue
Fri 6/1107:25
LHR
-
ISP
2 stops43h 12m
JetBlue
Deal found 7/6£943
Thu 25/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Mon 29/614:00
LGW
-
ISP
1 stop30h 56m
Multiple Airlines
Deal found 8/6£982
Sat 4/714:22
ISP
-
LHR
2 stops36h 43m
Multiple Airlines
Fri 10/707:40
LHR
-
ISP
2 stops21h 06m
Multiple Airlines
Deal found 11/6£1,097
Mon 2/1109:59
ISP
-
LHR
1 stop15h 31m
Multiple Airlines
Fri 6/1108:50
LHR
-
ISP
2 stops16h 11m
Multiple Airlines
Deal found 7/6£1,117
Thu 10/1214:19
ISP
-
LHR
2 stops12h 46m
Multiple Airlines
Thu 17/1208:50
LHR
-
ISP
2 stops16h 11m
Multiple Airlines
Deal found 8/6£1,118
Thu 25/611:30
ISP
-
LHR
2 stops52h 15m
JetBlue
Mon 29/611:55
LHR
-
ISP
2 stops28h 35m
JetBlue
Deal found 8/6£1,250
Thu 25/611:30
ISP
-
LGW
2 stops17h 05m
JetBlue
Mon 29/612:20
LGW
-
ISP
2 stops39h 37m
JetBlue
Deal found 8/6£1,284

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 12 June 2026.

Round-trip from

£665

One-way from

£398

Popular in

June

Cheapest in

September

Average price

£628
4/7-10/7
  • 4/7-10/7
  • 3 total stops
  • 65h 56m total
  • Islip to London
Search Deals
3/8
  • 3/8
  • 2 total stops
  • 29h 20m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£76 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£12 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 12 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

Sat 4/7

11:57-10:00

2 stops41h 03m

London Gatwick

Fri 10/7

14:00-09:53

1 stop24h 53m

£665

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 22/8

11:55-11:45

2 stops18h 50m

London Gatwick

Sun 30/8

15:40-22:05

2 stops35h 25m

£826

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 22/8

15:15-11:55

2 stops15h 40m

London Heathrow

Sun 30/8

21:25-22:05

2 stops29h 40m

£866

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 25/6

21:52-10:00

1 stop31h 08m

London Gatwick

Mon 29/6

14:00-15:56

1 stop30h 56m

£982

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 4/7

14:22-08:05

2 stops36h 43m

London Heathrow

Fri 10/7

07:40-23:46

2 stops21h 06m

£1,097
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 2/11

07:25-07:00

1 stop18h 35m

London Heathrow

Fri 6/11

13:10-20:01

1 stop11h 51m

£1,145

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 25/6

11:30-20:45

2 stops52h 15m

London Heathrow

Mon 29/6

11:55-11:30

2 stops28h 35m

£1,250

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 25/6

11:30-09:35

2 stops17h 05m

London Gatwick

Mon 29/6

12:20-22:57

2 stops39h 37m

£1,284

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 25/6

16:45-08:00

1 stop10h 15m

London Heathrow

Mon 29/6

14:10-10:56

2 stops25h 46m

£1,612
Cheapest one-way
Fastest single journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 3/8

10:00-20:20

2 stops29h 20m

£398

Flights are sorted by cheapest return flights first.

Deals found on 9/6

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.

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

    A quick flight from Islip, New York to London can take about 52h 15m. JetBlue provides one of the quickest options available for as low as £1,250. 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
Slough
Ilford
Croydon
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Watford
Ipswich
Guildford
Romford
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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