$2,153+ Cheap flights from Islip, NY (ISP) to Portugal
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LIS
Dec 14 — Dec 211
1 adult, Economy
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Cheapest flights from Islip to PortugalExplore the most affordable flight options available from Islip to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 14, 2025.
Explore the most affordable flight options available from Islip to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 14, 2025.
This Kiwi.com deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2712:30 pmISP - LIS
1 stop16h 25mMultiple Airlines
Sat 1/36:55 amLIS - ISP
2 stops33h 10mMultiple Airlines
Deal found 11/12![Multiple Airlines logo]()
$2,153
Cheap flight deals from Islip to Portugal
Keep the following information in mind while searching for Islip to Portugal flight deals. Data was last updated November 14, 2025.
Most accurate provider | Gotogate 3 stars |
|---|---|
Most trusted provider | Gotogate 3 stars |
Round-trip from | $2,153 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $625 |
Cheapflights Fare Finder
Customize your flight search to find flights from Islip to Portugal 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 2,558,603 searches. Data last updated November 14, 2025.
Use the filters below to find and compare flights from Islip to Portugal that are best for you.
Fly from
Islip
Fly to
Portugal
Route
Depart
Return
Price
IslipLisbon
ISP - LIS
ISPLIS
Islip Long Island
Sat 12/27
12:30 pm-9:55 am
1 stop16h 25m
Lisbon Humberto Delgado
Sat 1/3
6:55 am-11:05 am
2 stops33h 10m
$2,153
Best time to book a flight from Islip to Portugal
Have a flexible travel schedule? Discover the best time to fly to Portugal from Islip with our price prediction graph.
Estimated round-trip 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 Portugal
What is the cheapest month to book a flight from Islip, New York to Portugal?
Currently, January is the cheapest month in which you can book a flight from Islip, New York to Portugal (average of $286). Flying from Islip, New York to Portugal in June is currently the most expensive (average of $453). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.