How long is the flight from Islip, New York to Lisbon?

Departing from Islip, New York to Lisbon will take you 17h 13m. The distance between Islip, New York and Lisbon is about 3319 mi.

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).

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.

Most accurate provider : When it comes to deals on Islip, New York-Lisbon flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Lisbon flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-Lisbon flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Islip, New York-Lisbon flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-Lisbon flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

$1,166+ Flights from Islip, NY to Lisbon

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Cheap flight deals from Islip to Lisbon

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 December 14, 2025.

Sat 2/2812:35 pmISP - LIS

2 stops26h 45mMultiple Airlines

Mon 3/911:40 amLIS - ISP

1 stop27h 25mMultiple Airlines

Deal found 12/13

$1,166

Sat 2/281:27 pmISP - LIS

2 stops17h 13mTAP AIR PORTUGAL

Mon 3/912:05 pmLIS - ISP

2 stops25h 57mTAP AIR PORTUGAL

Deal found 12/13

$1,185

Find flight deals from Islip to Lisbon

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$1,166 (Kiwi.com)
Popular in	June
Cheapest in	January
Average price	$765

Provider with most accurate pricing for Islip Long Island-Lisbon Humberto Delgado flight deals.

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Provider most trusted by Cheapflights users for Islip Long Island-Lisbon Humberto Delgado flights.

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From Islip Long Island to Lisbon Humberto Delgado

Search Deals

Highest demand for flights based on searches. 18% potential increase in price ($173 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).

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Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Sat 2/28

12:35 pm-8:20 pm

2 stops26h 45m

Lisbon Humberto Delgado

Mon 3/9

11:40 am-11:05 am

1 stop27h 25m

$1,166

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Sat 2/28

1:27 pm-11:40 am

2 stops17h 13m

Lisbon Humberto Delgado

Mon 3/9

12:05 pm-10:02 am

2 stops25h 57m

$1,185

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Compare providers for flights from Islip to Lisbon

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Lisbon in December.

Provider	Price Accuracy	Trust Score*
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
AranGrant	Price Accuracy2 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Islip, New York-Lisbon flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Lisbon flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-Lisbon flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Islip, New York-Lisbon flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-Lisbon flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, March is the cheapest month in which you can book a flight from Islip, New York to Lisbon (average of $401). Flying from Islip, New York to Lisbon in July is currently the most expensive (average of $485). 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, New York to Lisbon?
Departing from Islip, New York to Lisbon will take you 17h 13m. The distance between Islip, New York and Lisbon is about 3319 mi.
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, March is the cheapest month in which you can book a flight from Islip, New York to Lisbon (average of $401). Flying from Islip, New York to Lisbon in July is currently the most expensive (average of $485). 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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$1,166+ 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 2/28. 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

Best flights from Islip to LisbonDiscover 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 December 14, 2025.

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 December 14, 2025.

Find flight deals from Islip to Lisbon

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Compare providers for flights from Islip to Lisbon

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Lisbon in December.

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.

How long is the flight from Islip, New York to Lisbon?

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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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 December 14, 2025.