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$1,114+ Cheap flights from Islip (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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LIS
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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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 septiembre 11, 2025.

Round-trip from

$1,114
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$775
From Islip Long Island to Portugal
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($156 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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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 septiembre 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
sáb. 10/2511:53 amISP - OPO
1 stop17h 47mMultiple Airlines
sáb. 11/18:55 amOPO - ISP
2 stops15h 06mMultiple Airlines
Deal found 9/10$1,114
This oojo deal was found by Cheapflights users on 9/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/2511:35 amISP - OPO
2 stops21h 35mTAP AIR PORTUGAL
sáb. 11/16:35 pmOPO - ISP
2 stops47h 27mTAP AIR PORTUGAL
Deal found 9/10$1,348

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 septiembre 11, 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

sáb. 10/25

11:53 am-10:40 am

1 stop17h 47m

Porto

sáb. 11/1

8:55 am-8:01 pm

2 stops15h 06m

$1,114

IslipPorto

ISP - OPO

ISPOPO

Islip Long Island

sáb. 10/25

11:35 am-2:10 pm

2 stops21h 35m

Porto

sáb. 11/1

6:35 pm-2:02 pm

2 stops47h 27m

$1,348

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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 to Portugal?

Currently, January is the cheapest month in which you can book a flight from Islip to Portugal (average of $612). Flying from Islip to Portugal in June is currently the most expensive (average of $1,127). 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.

  • How long is the flight from Islip to Portugal?

    Airlines like TAP AIR PORTUGAL fly from Islip to Portugal in about 21h 35m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 3275 mi.

  • 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 to Portugal?

    Currently, January is the cheapest month in which you can book a flight from Islip to Portugal (average of $612). Flying from Islip to Portugal in June is currently the most expensive (average of $1,127). 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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