How long is the flight from Islip to Lisbon?

Departing from Islip to Lisbon will take you 15h 58m. The distance between Islip 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).

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

To save on the cost of your flight from Islip to Lisbon, book at least 52 days before your planned departure. Booking around this time can save you about 3% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $681 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,050.

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

Our data shows that January tends to be the cheapest month to fly to Lisbon from Islip. Users have commonly found prices around $771 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 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.

$952+ Cheap Flights from Islip to Lisbon

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Cheap flight deals from Islip to Lisbon

Round-trip from	$952 (oojo)
Popular in	June
Cheapest in	January
Average price	$775

From Islip Long Island to Lisbon Humberto Delgado

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).

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Average for round-trip flights in September 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 September 13, 2025.

Tue 10/281:57 pmISP - LIS

2 stops15h 58mTAP AIR PORTUGAL

Tue 11/44:40 pmLIS - ISP

2 stops27h 50mTAP AIR PORTUGAL

Deal found 9/13

$952

Tue 10/286:27 pmISP - LIS

2 stops30h 58mMultiple Airlines

Tue 11/411:50 amLIS - ISP

1 stop12h 55mMultiple Airlines

Deal found 9/13

$1,105

Sat 10/112:19 pmISP - LIS

2 stops26h 01mMultiple Airlines

Sat 10/189:55 pmLIS - ISP

2 stops26h 50mMultiple Airlines

Deal found 9/13

$1,513

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 September 13, 2025.

Tue 10/281:57 pmISP - LIS

2 stops15h 58mTAP AIR PORTUGAL

Tue 11/44:40 pmLIS - ISP

2 stops27h 50mTAP AIR PORTUGAL

Deal found 9/13

$952

Tue 10/286:27 pmISP - LIS

2 stops30h 58mMultiple Airlines

Tue 11/411:50 amLIS - ISP

1 stop12h 55mMultiple Airlines

Deal found 9/13

$1,105

Sat 10/112:19 pmISP - LIS

2 stops26h 01mMultiple Airlines

Sat 10/189:55 pmLIS - ISP

2 stops26h 50mMultiple Airlines

Deal found 9/13

$1,513

Last-minute flights from Islip to Lisbon
Discover last-minute flight deals from Islip to Lisbon. Data last updated September 13, 2025 and is based on user searches.

Sat 10/112:19 pmISP - LIS

2 stops26h 01mMultiple Airlines

Sat 10/189:55 pmLIS - ISP

2 stops26h 50mMultiple Airlines

Deal found 9/13

$1,513

Tue 10/281:57 pmISP - LIS

2 stops15h 58mTAP AIR PORTUGAL

Tue 11/44:40 pmLIS - ISP

2 stops27h 50mTAP AIR PORTUGAL

Deal found 9/13

$952

Tue 10/286:27 pmISP - LIS

2 stops30h 58mMultiple Airlines

Tue 11/411:50 amLIS - ISP

1 stop12h 55mMultiple Airlines

Deal found 9/13

$1,105

Fly from

Fly to

Route

Depart

Return

Price

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Tue 10/28

1:57 pm-9:55 am

2 stops15h 58m

Lisbon Humberto Delgado

Tue 11/4

4:40 pm-3:30 pm

2 stops27h 50m

$952

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Tue 10/28

6:27 pm-5:25 am

2 stops30h 58m

Lisbon Humberto Delgado

Tue 11/4

11:50 am-7:45 pm

1 stop12h 55m

$1,105

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Sat 10/11

2:19 pm-9:20 pm

2 stops26h 01m

Lisbon Humberto Delgado

Sat 10/18

9:55 pm-7:45 pm

2 stops26h 50m

$1,513

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

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 to Lisbon?

Currently, January is the cheapest month in which you can book a flight from Islip to Lisbon (average of $612). Flying from Islip to Lisbon 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

How long is the flight from Islip to Lisbon?
Departing from Islip to Lisbon will take you 15h 58m. The distance between Islip 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 to Lisbon?
Currently, January is the cheapest month in which you can book a flight from Islip to Lisbon (average of $612). Flying from Islip to Lisbon 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.

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$952+ Cheap flights from Islip (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 10/28. 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

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2. Select your favorite providers

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Cheap flight deals from Islip to Lisbon

Round-trip from

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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 September 13, 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 September 13, 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 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 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 to Lisbon?

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Alternative routes for Islip 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 September 13, 2025.