Portugal

$1,307+ 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 8/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LIS
Jul 8 — Jul 151
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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 July 3, 2025.

Round-trip from

$1,307
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$882
From Islip Long Island to Portugal
Highest demand for flights based on searches. 16% potential increase in price ($153 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
Average for round-trip flights in July 2025

Find flight deals from Islip to Portugal

Cheapest flights from Islip to Portugal
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 July 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/2. 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.
Sun 8/172:19 pmISP - OPO
1 stop15h 16mMultiple Airlines
Sun 8/246:30 amOPO - ISP
2 stops30h 38mMultiple Airlines
Deal found 7/2$1,307
This Kiwi.com deal was found by Cheapflights users on 7/3. 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.
Sun 8/172:19 pmISP - LIS
1 stop14h 31mMultiple Airlines
Sun 8/247:10 amLIS - ISP
2 stops29h 58mMultiple Airlines
Deal found 7/3$1,361

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 July 3, 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

IslipPorto

ISP - OPO

ISPOPO

Islip Long Island

Sun 8/17

2:19 pm-10:35 am

1 stop15h 16m

Porto

Sun 8/24

6:30 am-8:08 am

2 stops30h 38m

$1,307

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Sun 8/17

2:19 pm-9:50 am

1 stop14h 31m

Lisbon Humberto Delgado

Sun 8/24

7:10 am-8:08 am

2 stops29h 58m

$1,361

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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 $612). Flying from Islip, New York to Portugal in June is currently the most expensive (average of $1,130). 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.

Related info for your journey

Find useful and relevant information for your journey from Islip to Portugal. 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 Portugal?

    Located just 7.2 mi from the city center, Islip Long Island (ISP) is the airport most travelers will use when flying to Portugal from Islip.

  • Can I find deals for flights from Islip to Portugal that include hotel bookings?

    Yes. In addition to deals on Islip to Portugal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Portugal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Portugal.

  • Can I find deals for business class flights from Islip to Portugal?

    Yes. Cheapflights offers flight deals from Islip to Portugal by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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 $612). Flying from Islip, New York to Portugal in June is currently the most expensive (average of $1,130). 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.

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