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$1,051+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LIS
Nov 19 — Nov 261
Wed 11/19
Wed 11/26
1 adult, Economy
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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 October 20, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/20. 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.
Thu 12/410:19 amISP - LIS
2 stops18h 56mMultiple Airlines
Thu 12/1111:30 amLIS - ISP
1 stop13h 15mMultiple Airlines
Deal found 10/20$1,051
This Kiwi.com deal was found by Cheapflights users on 10/18. 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.
Tue 12/212:40 pmISP - LIS
1 stop11h 55mMultiple Airlines
Tue 12/911:50 amLIS - ISP
1 stop12h 55mMultiple Airlines
Deal found 10/18$1,110
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Wed 12/312:40 pmISP - LIS
1 stop11h 55mMultiple Airlines
Wed 12/1011:40 amLIS - ISP
1 stop13h 05mMultiple Airlines
Deal found 10/19$1,158

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 October 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,110
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$647
Provider with most accurate pricing for New York (NYC)-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Lisbon Humberto Delgado flights.
Search Deals
From Islip Long Island to Portugal
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($168 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 20, 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

Thu 12/4

10:19 am-10:15 am

2 stops18h 56m

Lisbon Humberto Delgado

Thu 12/11

11:30 am-7:45 pm

1 stop13h 15m

$1,051

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Tue 12/2

12:40 pm-5:35 am

1 stop11h 55m

Lisbon Humberto Delgado

Tue 12/9

11:50 am-7:45 pm

1 stop12h 55m

$1,110

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Wed 12/3

12:40 pm-5:35 am

1 stop11h 55m

Lisbon Humberto Delgado

Wed 12/10

11:40 am-7:45 pm

1 stop13h 05m

$1,158

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

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 $302). 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.

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 $302). 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.

See more FAQs

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