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$1,406+ 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 12/13. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LIS
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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Cheap flight deals from Islip to Lisbon

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Lisbon (LIS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,406
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$647
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
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Highest demand for flights based on searches. 18% potential increase in price ($169 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 October 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 October 29, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1312:40 pmISP - LIS
1 stop16h 15mMultiple Airlines
Sat 12/206:45 pmLIS - ISP
2 stops47h 24mMultiple Airlines
Deal found 10/28$1,406

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Lisbon that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 29, 2025.
Use the filters below to find and compare flights from Islip to Lisbon that are best for you.

Fly from

Islip

Fly to

Lisbon

Route

Depart

Return

Price

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Sat 12/13

12:40 pm-9:55 am

1 stop16h 15m

Lisbon Humberto Delgado

Sat 12/20

6:45 pm-1:09 pm

2 stops47h 24m

$1,406

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

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 October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust 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, January is the cheapest month in which you can book a flight from Islip, New York to Lisbon (average of $410). Flying from Islip, New York to Lisbon in July is currently the most expensive (average of $483). 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

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?

    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 $410). Flying from Islip, New York to Lisbon in July is currently the most expensive (average of $483). 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.

See more FAQs

Traveling to a place near Lisbon?

Book flights to Lisbon if you plan to visit one of these locations
Sintra
Fátima
Oeiras
Nazaré
Ericeira
Costa da Caparica
Torres Vedras
Beja
Sesimbra
Colares

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