Cheap flights from Islip to Lisbon from $1,182

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 to Lisbon departing on 11/3. 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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Find the cheapest flights from Islip to Lisbon (ISP-LIS)

Cheap round-trip flights

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4:33 pm - 5:35 amISP-LIS
32h 02m1 stop
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6:45 pm - 10:37 amLIS-ISP
44h 52m2 stops
$1,182
Find Deal
Mon, Nov 3 - Mon, Nov 10
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5:05 pm - 10:50 amISP-LIS
36h 45m2 stops
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11:45 am - 10:58 amLIS-ISP
28h 13m1 stop
$1,236
Find Deal
Fri, Oct 3 - Fri, Oct 10
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7:30 am - 5:00 pmISP-LIS
28h 30m3 stops
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11:40 am - 8:01 pmLIS-ISP
13h 21m1 stop
$1,390
Find Deal
Mon, Nov 3 - Mon, Nov 10
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2:19 pm - 5:35 amISP-LIS
10h 16m1 stop
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11:40 am - 8:01 pmLIS-ISP
13h 21m1 stop
$1,454
Find Deal
Mon, Nov 3 - Mon, Nov 10
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11:53 am - 9:00 pmISP-LIS
28h 07m3 stops
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7:25 am - 8:01 pmLIS-ISP
17h 36m2 stops
$1,550
Find Deal
Mon, Nov 3 - Mon, Nov 10
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2:19 pm - 9:50 pmISP-LIS
26h 31m2 stops
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6:35 am - 10:58 amLIS-ISP
33h 23m3 stops
$1,638
Find Deal
Fri, Oct 3 - Fri, Oct 10
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11:53 am - 4:45 pmISP-LIS
23h 52m3 stops
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6:35 am - 10:58 amLIS-ISP
33h 23m3 stops
$1,677
Find Deal
Fri, Oct 3 - Fri, Oct 10
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4:33 pm - 5:40 amISP-LIS
32h 07m1 stop
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11:45 am - 10:58 amLIS-ISP
28h 13m1 stop
$1,692
Find Deal
Fri, Oct 3 - Fri, Oct 10
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11:53 am - 5:40 amISP-LIS
12h 47m1 stop
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6:35 am - 10:58 amLIS-ISP
33h 23m3 stops
$1,839
Find Deal
Fri, Oct 3 - Fri, Oct 10

momondo 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, momondo users made 832,500 searches. Data last updated August 20, 2025.
Use the filters below to find and compare flights from Islip to Lisbon that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Mon 11/3

4:33 pm-5:35 am

1 stop32h 02m

Lisbon Humberto Delgado

Mon 11/10

6:45 pm-10:37 am

2 stops44h 52m

$1,182

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Fri 10/3

5:05 pm-10:50 am

2 stops36h 45m

Lisbon Humberto Delgado

Fri 10/10

11:45 am-10:58 am

1 stop28h 13m

$1,236

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Mon 11/3

7:30 am-5:00 pm

3 stops28h 30m

Lisbon Humberto Delgado

Mon 11/10

11:40 am-8:01 pm

1 stop13h 21m

$1,390

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Mon 11/3

2:19 pm-5:35 am

1 stop10h 16m

Lisbon Humberto Delgado

Mon 11/10

11:40 am-8:01 pm

1 stop13h 21m

$1,454

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Mon 11/3

11:53 am-9:00 pm

3 stops28h 07m

Lisbon Humberto Delgado

Mon 11/10

7:25 am-8:01 pm

2 stops17h 36m

$1,550

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Fri 10/3

2:19 pm-9:50 pm

2 stops26h 31m

Lisbon Humberto Delgado

Fri 10/10

6:35 am-10:58 am

3 stops33h 23m

$1,638

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Fri 10/3

11:53 am-4:45 pm

3 stops23h 52m

Lisbon Humberto Delgado

Fri 10/10

6:35 am-10:58 am

3 stops33h 23m

$1,677

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Fri 10/3

4:33 pm-5:40 am

1 stop32h 07m

Lisbon Humberto Delgado

Fri 10/10

11:45 am-10:58 am

1 stop28h 13m

$1,692

IslipLisbon

ISP - LIS

ISPLIS

Islip Long Island

Fri 10/3

11:53 am-5:40 am

1 stop12h 47m

Lisbon Humberto Delgado

Fri 10/10

6:35 am-10:58 am

3 stops33h 23m

$1,839

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Lisbon from

How to get the cheapest flight ticket from Islip 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 $721. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Islip to Lisbon for around $872.

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 $782 on average. Flights to Lisbon from Islip in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from Islip to Lisbon

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

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

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

Direct flights

None
There are no direct flights from Islip to Lisbon. There are no popular flight routes from Islip to Lisbon.
  • 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. 10h 16m 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
Nazaré
Ericeira
Setúbal
Oeiras
Almada
Peniche
Evora
Sesimbra
Estoril
Leiria
Figueira da Foz
Tomar
Zambujeira do Mar
Torres Vedras
Batalha
Óbidos
Comporta
Costa da Caparica

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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1 adult
Mon 8/25
Mon 9/1

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