In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

What is the cheapest time of day to fly from ISP to OPO?

When flying from Islip, New York to Porto, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

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

How can I find direct flights from Islip to Porto?

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

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

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

$2,165+ Flights from Islip, NY to Porto

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Cheap flight deals from Islip to Porto

Cheapest flights from Islip to Porto
Explore the most affordable flight options available from Islip to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

Fri 3/139:59 am

ISP

OPO

2 stops21h 51m

Multiple Airlines

Fri 3/207:25 pm

OPO

ISP

3 stops27h 19m

Multiple Airlines

Deal found 1/27

$2,165

Best flights from Islip to Porto
Discover carefully curated flight deals from Islip to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 28, 2026.

Fri 3/139:59 am

ISP

OPO

2 stops21h 51m

Multiple Airlines

Fri 3/207:25 pm

OPO

ISP

3 stops27h 19m

Multiple Airlines

Deal found 1/27

$2,165

Find flight deals from Islip to Porto

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$2,165 (Mytrip)
Popular in	December
Cheapest in	February
Average price	$733

Provider with most accurate pricing for New York (NYC)-Porto flight deals.

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From Islip Long Island to Porto

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Highest demand for flights based on searches. 2% potential increase in price ($22 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).

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Average for round-trip flights in January 2026

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Fly from

Fly to

Route

Depart

Return

Price

IslipPorto

ISP - OPO

ISPOPO

Islip Long Island

Fri 3/13

9:59 am-11:50 am

2 stops21h 51m

Porto

Fri 3/20

7:25 pm-6:44 pm

3 stops27h 19m

$2,165

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Best time to book a flight from Islip to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto 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 Porto

What is the cheapest month to book a flight from Islip, New York to Porto?

Currently, April is the cheapest month in which you can book a flight from Islip, New York to Porto (average of $377). Flying from Islip, New York to Porto in June is currently the most expensive (average of $619). 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

Can I find deals for flights from Islip to Porto that include hotel bookings?
Yes. In addition to deals on Islip to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Porto?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Porto.
Can I find deals for business class flights from Islip to Porto?
Yes. Cheapflights offers flight deals from Islip to Porto 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 Porto?
Currently, April is the cheapest month in which you can book a flight from Islip, New York to Porto (average of $377). Flying from Islip, New York to Porto in June is currently the most expensive (average of $619). 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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$2,165+ Cheap flights from Islip, NY (ISP) to Porto (OPO)

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 3/13. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Porto with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to Porto

Cheapest flights from Islip to PortoExplore the most affordable flight options available from Islip to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

Explore the most affordable flight options available from Islip to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

Find flight deals from Islip to Porto

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Best time to book a flight from Islip to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Islip with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Islip to Porto

What is the cheapest month to book a flight from Islip, New York to Porto?

Related info for your journey

Find useful and relevant information for your journey from Islip to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

How can I find direct flights from Islip to Porto?

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

What is the cheapest month to book a flight from Islip, New York to Porto?

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Cheapest flights from Islip to Porto
Explore the most affordable flight options available from Islip to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.