$151 Cheap Flights from Rosario (ROS) to Posadas (PSS)

View $151 flight on Sat, Aug 9, 2025Opens in a new window

Popular airlines from Rosario (ROS-Rosario - Islas Malvinas Intl.) to Posadas (PSS-Libertador General Jose de San Martin)

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Cheap Flights from Rosario to Posadas (ROS-PSS)

Prices were available within the past 7 days and start at $151 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Flights from Rosario (ROS) to Posadas (PSS)
Origin airport
Rosario - Islas Malvinas Intl.
Destination airport
Libertador General Jose de San Martin
Distance
477 mi

Rosario to Posadas Flights

The cheapest times to fly from Rosario 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 Rosario to Posadas are during the month of . You can find some of the cheapest flights from Rosario to Posadas with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Rosario to Posadas

Sunday is one of the best days to book for cheap flights from Rosario 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 Rosario 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 Rosario to Posadas in 2025. You can also book with separate airlines for your outbound and return journeys, from $151 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 Rosario 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 Rosario 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.

 

Frequently asked questions

How much does a flight from Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS) cost?
Snag a cheap one-way flight from $151 or cheap return flight from Rosario - Islas Malvinas Intl. Airport (ROS) 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 offers on this route.
What is the cheapest month to fly from Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS)?
Traveling in can help you save, as it's the cheapest month for flights between ROS and PSS. You'll often find the lowest fares during the off-season.
What is the cheapest airline that flies from Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest ROS to PSS flight.
How many flights per day from Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS)?
There aren't any daily direct flights departing from Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS). But you can choose flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from ROS to PSS?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS)?
To avoid possible delays on the Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS) route, aim to fly before 3 PM. Flights after this time 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 Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS) last-minute?
Last-minute fares from ROS to PSS are typically more expensive. To secure the lowest rates, start looking for flights as early as possible. That said, if your travel plans are flexible, it's possible to land a cheap fare right before your journey.
Is it cheaper to book a ROS to PSS flight and hotel package?
Compared with arranging hotels and flights separately, booking a ROS to PSS flight and hotel package with Expedia could result in significant savings. What's more, having it all in one place will take the stress out of planning your trip. Simply secure your flights and select from our wide range of stays, then customize your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Rosario - Islas Malvinas Intl. Airport (ROS) to Libertador General Jose de San Martin Airport (PSS)?
If you booked your ROS 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 ticket you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for further details.

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