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Cheap flights from Islip, New York to Lisbon from $1,168

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Lisbon departing on 12/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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Multiple Airlines Logo
8:29 pm - 5:25 amISP-LIS
51h 56m2 stops
Multiple Airlines Logo
5:15 pm - 11:04 amLIS-ISP
22h 49m1 stop
$1,168Multiple Airlines
Find Deal
Tue, Dec 9 - Sun, Dec 21
Multiple Airlines Logo
7:30 am - 5:35 amISP-LIS
17h 05m1 stop
Multiple Airlines Logo
5:15 pm - 11:04 amLIS-ISP
22h 49m1 stop
$1,467Multiple Airlines
Find Deal
Tue, Dec 9 - Sun, Dec 21
TAP AIR PORTUGAL Logo
11:50 am - 9:55 amISP-LIS
17h 05m2 stops
TAP AIR PORTUGAL Logo
5:15 pm - 1:19 pmLIS-ISP
25h 04m2 stops
$1,528TAP AIR PORTUGAL
Find Deal
Tue, Dec 9 - Sun, Dec 21

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York 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, momondo users made 832,500 searches. Data last updated November 3, 2025.
Use the filters below to find and compare flights from Islip, New York to Lisbon that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Tue 12/9

8:29 pm-5:25 am

2 stops51h 56m

Lisbon Humberto Delgado

Sun 12/21

5:15 pm-11:04 am

1 stop22h 49m

$1,168

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Tue 12/9

7:30 am-5:35 am

1 stop17h 05m

Lisbon Humberto Delgado

Sun 12/21

5:15 pm-11:04 am

1 stop22h 49m

$1,467

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Tue 12/9

11:50 am-9:55 am

2 stops17h 05m

Lisbon Humberto Delgado

Sun 12/21

5:15 pm-1:19 pm

2 stops25h 04m

$1,528

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from Islip, New York to Lisbon

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Lisbon?

Our data shows that Tuesday is the least expensive day to fly to Lisbon. Tickets to fly out on this day can be as low as $705. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Islip, New York to Lisbon for around $847.

What is the cheapest time of day to depart on your flight to Lisbon?

The cheapest time of day to fly to Lisbon is at noon when flights can be purchased for as low as $661. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $760 on average. Flights to Lisbon from Islip, New York in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from Islip, New York to Lisbon

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Lisbon according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip, New York to Lisbon (ISP to LIS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Lisbon

Direct flights

None
There are no direct flights from Islip, New York to Lisbon. There are no popular flight routes from Islip, New York to Lisbon.
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  • How far is Islip Long Island to Lisbon Humberto Delgado by plane?

    A flight from Islip Long Island to Lisbon Humberto Delgado will travel around 3327.5 mi. 17h 05m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Islip Long Island Airport to Lisbon Humberto Delgado Airport?

    Prices for flights from Islip Long Island Airport to Lisbon Humberto Delgado Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Islip Long Island Airport to Lisbon Humberto Delgado Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Lisbon Humberto Delgado Airport.

  • What documentation or ID do you need to fly to Lisbon Humberto Delgado Airport?

    The necessary travel and health documents for your Lisbon Humberto Delgado Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Lisbon?

Book flights to Lisbon if you plan to visit one of these locations
Sintra
Fátima
Ericeira
Nazaré
Oeiras
Setúbal
Peniche
Estoril
Leiria
Sesimbra
Tomar
Almada
Evora
Zambujeira do Mar
Batalha
Figueira da Foz
Óbidos
Torres Vedras
Comporta
Sines

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Lisbon?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Lisbon from Islip.

Can I find flights from Islip to Lisbon with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Lisbon from Islip with this policy.

How can momondo help me find flights from Islip to Lisbon?

Once all potential Islip to Lisbon flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Islip to Lisbon right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Lisbon, momondo offers a useful price alert feature which will track prices for flights to Lisbon from Islip and alert you when they change.

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