$824 Cheap Flights from Newark Liberty Intl. Airport (EWR) to Posadas (PSS)

View $824 flight on Mon, Nov 24, 2025Opens in a new window

Popular airlines from Newark Liberty Intl. Airport (EWR) to Posadas (PSS-Libertador General Jose de San Martin)

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Cheap Flights from Newark Liberty Intl. Airport to Posadas (EWR-PSS)

Prices were available within the past 7 days and start at $824 for one-way flights and $1,211 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Dec 2 - Thu, Dec 18
EWR
New York
PSS
Posadas
$1,211 Roundtrip, found 5 days ago
$1,211
Roundtrip
found 5 days ago
Select United flight, departing Tue, Dec 2 from New York to Posadas, returning Thu, Dec 18, priced at $1,211 found 5 days ago
United
Tue, Nov 11 - Wed, Dec 3
EWR
New York
PSS
Posadas
$1,219 Roundtrip, found 3 days ago
$1,219
Roundtrip
found 3 days ago
Select United flight, departing Tue, Nov 11 from New York to Posadas, returning Wed, Dec 3, priced at $1,219 found 3 days ago
United
Fri, Nov 14 - Wed, Dec 3
EWR
New York
PSS
Posadas
$1,262 Roundtrip, found 3 days ago
$1,262
Roundtrip
found 3 days ago
Select United flight, departing Fri, Nov 14 from New York to Posadas, returning Wed, Dec 3, priced at $1,262 found 3 days ago
United
Wed, Nov 12 - Wed, Dec 3
EWR
New York
PSS
Posadas
$1,268 Roundtrip, found 3 days ago
$1,268
Roundtrip
found 3 days ago
Select United flight, departing Wed, Nov 12 from New York to Posadas, returning Wed, Dec 3, priced at $1,268 found 3 days ago
United
Sat, Nov 15 - Wed, Dec 3
EWR
New York
PSS
Posadas
$1,311 Roundtrip, found 3 days ago
$1,311
Roundtrip
found 3 days ago
Select United flight, departing Sat, Nov 15 from New York to Posadas, returning Wed, Dec 3, priced at $1,311 found 3 days ago
United
Thu, Jan 22 - Wed, Feb 4
EWR
New York
PSS
Posadas
$1,319 Roundtrip, found 5 days ago
$1,319
Roundtrip
found 5 days ago
Select United flight, departing Thu, Jan 22 from New York to Posadas, returning Wed, Feb 4, priced at $1,319 found 5 days ago
United
Fri, Nov 21 - Mon, Dec 8
EWR
New York
PSS
Posadas
$1,354 Roundtrip, found 5 days ago
$1,354
Roundtrip
found 5 days ago
Select United flight, departing Fri, Nov 21 from New York to Posadas, returning Mon, Dec 8, priced at $1,354 found 5 days ago
United
Fri, Nov 14 - Sat, Nov 22
EWR
New York
PSS
Posadas
$1,358 Roundtrip, found 6 days ago
$1,358
Roundtrip
found 6 days ago
Select United flight, departing Fri, Nov 14 from New York to Posadas, returning Sat, Nov 22, priced at $1,358 found 6 days ago
United
Sat, Nov 15 - Sat, Nov 22
EWR
New York
PSS
Posadas
$1,382 Roundtrip, found 6 days ago
$1,382
Roundtrip
found 6 days ago
Select United flight, departing Sat, Nov 15 from New York to Posadas, returning Sat, Nov 22, priced at $1,382 found 6 days ago
United
Wed, Nov 12 - Sat, Nov 22
EWR
New York
PSS
Posadas
$1,398 Roundtrip, found 3 days ago
$1,398
Roundtrip
found 3 days ago
Select United flight, departing Wed, Nov 12 from New York to Posadas, returning Sat, Nov 22, priced at $1,398 found 3 days ago

Frequently asked questions

How much does a flight from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS) cost?
Lock in a cheap one-way flight from $824 or cheap return flight from $1,211 from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS)?
December is the most affordable month to fly from EWR to PSS. Traveling outside of peak seasons is often the key to scoring lower fares.
What is the cheapest airline that flies from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from EWR to PSS. Then, sort your results by "Price (lowest to highest)" to pick up a good deal.
How many flights per day from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS)?
You'll have to catch a flight with a layover when traveling from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from EWR to PSS?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change depending on various factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS)?
To avoid possible delays on the Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS) route, aim to travel before 3 PM. Later flights are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS) last-minute?
Last-minute fares from EWR to PSS are usually more expensive. To lock in the lowest prices, start looking for flights as early as possible. That said, if your travel plans are flexible, you may land a cheap fare just before your departure.
Is it cheaper to book an EWR to PSS flight and hotel package?
You'll typically save money by booking an EWR to PSS flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. Once you've chosen your preferred accommodations and flights, you can add extras like activities, car rentals and tours.
Can I cancel or change the date of my flight from Liberty Intl. Airport (EWR) to Libertador General Jose de San Martin Airport (PSS)?
If you booked your EWR to PSS flight in the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

Travel information

Origin airport
Newark Liberty Intl. Airport
Destination airport
Libertador General Jose de San Martin
Roundtrip price
$1,211
Distance
4846 mi

Book with confidence

Newark Liberty Intl. Airport to Posadas Flights

The cheapest times to fly from Newark Liberty Intl. Airport to Posadas

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Newark Liberty Intl. Airport to Posadas are during the month of December. You can find some of the cheapest flights from Newark Liberty Intl. Airport to Posadas with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Newark Liberty Intl. Airport to Posadas

Sunday is one of the best days to book for cheap flights from Newark Liberty Intl. Airport to Posadas: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Newark Liberty Intl. Airport to Posadas

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Newark Liberty Intl. Airport to Posadas in 2025. You can also book with separate airlines for your outbound and return journeys, from $824 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Newark Liberty Intl. Airport to Posadas flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Newark Liberty Intl. Airport to Posadas airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Newark Liberty Intl. Airport to Posadas Flights

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*Available to One Key members.