In terms of precipitation, rainfall in Lisbon ranges from 0.2 - 4.8 inches per month. December is typically the wettest month, when rainfall can reach 4.8 in. July is typically the driest time to visit Lisbon when rainfall is around 0.2 in.

If weather is an important factor for your trip to Lisbon, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

How far in advance should I book a flight from Islip, New York to Lisbon?

To save on the cost of your flight from Islip, New York to Lisbon, book at least 52 days before your planned departure. Booking around this time can save you about 8% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $737 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $993.

What is the cheapest month to fly from Islip, New York to Lisbon?

Our data shows that January tends to be the cheapest month to fly to Lisbon from Islip, New York. Users have commonly found prices around $779 for the month, but tickets can be as low as $429. Due to multiple factors, prepare for potentially higher prices in June.

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip, New York to Lisbon as you normally would.

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

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

How can I find direct flights from Islip to Lisbon?

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

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

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

$1,132+ Flights from Islip, NY to Lisbon

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Cheap flight deals from Islip to Lisbon

Round-trip from	$1,132 (Kiwi.com)
Popular in	June
Cheapest in	January
Average price	$917

From Islip Long Island to Lisbon Humberto Delgado

Search Deals

Highest demand for flights based on searches. 16% potential increase in price ($154 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Find flight deals from Islip to Lisbon

Cheapest flights from Islip to Lisbon
Explore the most affordable flight options available from Islip to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Wed 9/104:33 pmISP - LIS

1 stop12h 37mMultiple Airlines

Wed 9/176:20 amLIS - ISP

2 stops33h 35mMultiple Airlines

Deal found 7/27

$1,132

Best flights from Islip to Lisbon
Discover carefully curated flight deals from Islip to Lisbon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Wed 9/104:33 pmISP - LIS

1 stop12h 37mMultiple Airlines

Wed 9/176:20 amLIS - ISP

2 stops33h 35mMultiple Airlines

Deal found 7/27

$1,132

Fly from

Fly to

Route

Depart

Return

Price

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Wed 9/10

4:33 pm-10:10 am

1 stop12h 37m

Lisbon Humberto Delgado

Wed 9/17

6:20 am-10:55 am

2 stops33h 35m

$1,132

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Best time to book a flight from Islip to Lisbon

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

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

Currently, January is the cheapest month in which you can book a flight from Islip, New York to Lisbon (average of $612). Flying from Islip, New York to Lisbon in June is currently the most expensive (average of $1,129). 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 Lisbon that include hotel bookings?
Yes. In addition to deals on Islip to Lisbon flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Lisbon?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Lisbon.
Can I find deals for business class flights from Islip to Lisbon?
Yes. Cheapflights offers flight deals from Islip to Lisbon 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 Lisbon?
Currently, January is the cheapest month in which you can book a flight from Islip, New York to Lisbon (average of $612). Flying from Islip, New York to Lisbon in June is currently the most expensive (average of $1,129). 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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$1,132+ Cheap flights from Islip, NY (ISP) to Lisbon (LIS)

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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Lisbon 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 Lisbon

Round-trip from

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Cheapest in

Average price

Find flight deals from Islip to Lisbon

Cheapest flights from Islip to LisbonExplore the most affordable flight options available from Islip to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Explore the most affordable flight options available from Islip to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Islip to Lisbon

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

Cheapflights Insights

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

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

Related info for your journey

Find useful and relevant information for your journey from Islip to Lisbon. 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 Lisbon that include hotel bookings?

How can I find direct flights from Islip to Lisbon?

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

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

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Cheapest flights from Islip to Lisbon
Explore the most affordable flight options available from Islip to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.