How long is the flight from Islip to Porto?

Departing from Islip to Porto will take you 21h 35m. Islip and Porto are separated by a distance of 3275 mi.

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).

How far in advance should I book a flight from Islip to Porto?

Find a great deal and save up to 72% by booking at least 52 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Islip to Porto within the next two weeks, with the cheapest ticket starting at $732.

What is the cheapest month to fly from Islip to Porto?

February can be a great time to fly to Porto from Islip with a flight ticket averaging about $786. Cheapflights users have found deals in the month of February for as cheap as $443. The most expensive prices can be found in the month of July.

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

When flying from Islip 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.

$1,114+ Flights from Islip to Porto

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Cheap flight deals from Islip to Porto

Round-trip from	$1,114 (Kiwi.com)
Popular in	July
Cheapest in	February
Average price	$787

From Islip Long Island to Porto

Search Deals

Highest demand for flights based on searches. 22% potential increase in price ($224 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($24 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 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 September 11, 2025.

Sat 10/2511:53 amISP - OPO

1 stop17h 47mMultiple Airlines

Sat 11/18:55 amOPO - ISP

2 stops15h 06mMultiple Airlines

Deal found 9/10

$1,114

Sat 10/2511:35 amISP - OPO

2 stops21h 35mTAP AIR PORTUGAL

Sat 11/16:35 pmOPO - ISP

2 stops47h 27mTAP AIR PORTUGAL

Deal found 9/10

$1,348

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 September 11, 2025.

Sat 10/2511:53 amISP - OPO

1 stop17h 47mMultiple Airlines

Sat 11/18:55 amOPO - ISP

2 stops15h 06mMultiple Airlines

Deal found 9/10

$1,114

Sat 10/2511:35 amISP - OPO

2 stops21h 35mTAP AIR PORTUGAL

Sat 11/16:35 pmOPO - ISP

2 stops47h 27mTAP AIR PORTUGAL

Deal found 9/10

$1,348

Last-minute flights from Islip to Porto
Discover last-minute flight deals from Islip to Porto. Data last updated September 11, 2025 and is based on user searches.

Sat 10/2511:53 amISP - OPO

1 stop17h 47mMultiple Airlines

Sat 11/18:55 amOPO - ISP

2 stops15h 06mMultiple Airlines

Deal found 9/10

$1,114

Sat 10/2511:35 amISP - OPO

2 stops21h 35mTAP AIR PORTUGAL

Sat 11/16:35 pmOPO - ISP

2 stops47h 27mTAP AIR PORTUGAL

Deal found 9/10

$1,348

Fly from

Fly to

Route

Depart

Return

Price

IslipPorto

ISP - OPO

ISPOPO

Islip Long Island

Sat 10/25

11:53 am-10:40 am

1 stop17h 47m

Porto

Sat 11/1

8:55 am-8:01 pm

2 stops15h 06m

$1,114

IslipPorto

ISP - OPO

ISPOPO

Islip Long Island

Sat 10/25

11:35 am-2:10 pm

2 stops21h 35m

Porto

Sat 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 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 to Porto?

Currently, January is the cheapest month in which you can book a flight from Islip to Porto (average of $523). Flying from Islip to Porto in June is currently the most expensive (average of $1,027). 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

How long is the flight from Islip to Porto?
Departing from Islip to Porto will take you 21h 35m. Islip and Porto are separated by a distance of 3275 mi.
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 to Porto?
Currently, January is the cheapest month in which you can book a flight from Islip to Porto (average of $523). Flying from Islip to Porto in June is currently the most expensive (average of $1,027). 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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$1,114+ Cheap flights from Islip (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 10/25. 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

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Cheap flight deals from Islip to Porto

Round-trip from

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Cheapest in

Average price

Find 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 September 11, 2025.

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 September 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Islip to Porto that are best for you.

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 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.

How long is the flight from Islip to Porto?

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 to Porto?

Traveling to a place near 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 September 11, 2025.