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Cheap flights from Islip, New York to Lisbon from $1,206

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 2/4. 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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0 bags

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Find the cheapest flights from Islip, New York to Lisbon

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:30 pm - 5:35 am
ISP
-
LIS
12h 05m1 stop
Multiple Airlines Logo
6:30 am - 2:39 pm
LIS
-
ISP
37h 09m2 stops
$1,206Multiple Airlines
Wed, Feb 4 - Wed, Feb 11
Multiple Airlines Logo
12:45 pm - 9:05 am
ISP
-
LIS
39h 20m2 stops
Multiple Airlines Logo
11:50 am - 7:45 pm
LIS
-
ISP
12h 55m1 stop
$1,257Multiple Airlines
Tue, Feb 3 - Tue, Feb 10
Multiple Airlines Logo
12:25 pm - 9:05 am
ISP
-
LIS
39h 40m2 stops
Multiple Airlines Logo
11:05 am - 10:02 am
LIS
-
ISP
51h 57m2 stops
$7,853Multiple Airlines
Wed, Feb 4 - Wed, Feb 11

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 December 23, 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

Wed 2/4

12:30 pm-5:35 am

1 stop12h 05m

Lisbon Humberto Delgado

Wed 2/11

6:30 am-2:39 pm

2 stops37h 09m

$1,206

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Tue 2/3

12:45 pm-9:05 am

2 stops39h 20m

Lisbon Humberto Delgado

Tue 2/10

11:50 am-7:45 pm

1 stop12h 55m

$1,257

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Wed 2/4

12:25 pm-9:05 am

2 stops39h 40m

Lisbon Humberto Delgado

Wed 2/11

11:05 am-10:02 am

2 stops51h 57m

$7,853

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 Wednesday is the least expensive day to fly to Lisbon. Tickets to fly out on this day can be as low as $701. 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 $851.

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 $754 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

Fastest flight time

26h 29m

Direct flights

None
The fastest flight from Islip, New York to Lisbon takes 26h 29m
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. 26h 29m 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
Ericeira
Fátima
Nazaré
Setúbal
Peniche
Estoril
Leiria
Oeiras
Sesimbra
Tomar
Evora
Figueira da Foz
Zambujeira do Mar
Batalha
Comporta
Torres Vedras
Óbidos
Sines
Almada

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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