$1,589 Cheap Flights from Atlanta (ATL) to Posadas (PSS)

View $1,589 flight on Sat, Dec 20, 2025Opens in a new window

Popular airlines from Hartsfield-Jackson Atlanta International Airport (ATL) to Posadas (PSS-Libertador General Jose de San Martin)

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Cheap Flights from Atlanta to Posadas (ATL-PSS)

Prices were available within the past 7 days and start at $1,589 for one-way flights and $3,236 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Aerolineas Argentinas
Sat, Dec 20 - Tue, Jan 6
ATL
Atlanta
PSS
Posadas
$3,236 Roundtrip, found 3 days ago
$3,236
Roundtrip
found 3 days ago
Select Aerolineas Argentinas flight, departing Sat, Dec 20 from Atlanta to Posadas, returning Tue, Jan 6, priced at $3,236 found 3 days ago
Aerolineas Argentinas
Sat, Dec 20 - Tue, Jan 6
ATL
Atlanta
PSS
Posadas
$3,376 Roundtrip, found 2 days ago
$3,376
Roundtrip
found 2 days ago
Select Aerolineas Argentinas flight, departing Sat, Dec 20 from Atlanta to Posadas, returning Tue, Jan 6, priced at $3,376 found 2 days ago
Aerolineas Argentinas
Sat, Dec 20 - Tue, Jan 6
ATL
Atlanta
PSS
Posadas
$3,580 Roundtrip, found 10 hours ago
$3,580
Roundtrip
found 10 hours ago
Select Aerolineas Argentinas flight, departing Sat, Dec 20 from Atlanta to Posadas, returning Tue, Jan 6, priced at $3,580 found 10 hours ago
Aerolineas Argentinas
Sat, Dec 20 - Tue, Jan 6
ATL
Atlanta
PSS
Posadas
$3,658 Roundtrip, found 1 day ago
$3,658
Roundtrip
found 1 day ago
Select Aerolineas Argentinas flight, departing Sat, Dec 20 from Atlanta to Posadas, returning Tue, Jan 6, priced at $3,658 found 1 day ago
Aerolineas Argentinas
Sat, Dec 20 - Tue, Jan 6
ATL
Atlanta
PSS
Posadas
$3,798 Roundtrip, found 10 hours ago
$3,798
Roundtrip
found 10 hours ago
Select Aerolineas Argentinas flight, departing Sat, Dec 20 from Atlanta to Posadas, returning Tue, Jan 6, priced at $3,798 found 10 hours ago
Flights from Atlanta (ATL) to Posadas (PSS)
Origin airport
Hartsfield-Jackson Atlanta Intl.
Destination airport
Libertador General Jose de San Martin
Airlines serving
Aerolineas Argentinas
Roundtrip price
$3,236
Distance
4611 mi

Atlanta to Posadas Flights

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

 

The best time to book a flight from Atlanta to Posadas

Sunday is one of the best days to book for cheap flights from Atlanta 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 Atlanta 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 Atlanta to Posadas in 2026. You can also book with separate airlines for your outbound and return journeys, from $1,589 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 Atlanta 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 Atlanta 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 Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS) cost?
Grab a cheap one-way flight from $1,589 or cheap return flight from $3,236 from Hartsfield-Jackson Atlanta Intl. Airport (ATL) 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 Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS)?
Traveling in December may help you find better deals, as it's the cheapest month for flights between ATL and PSS. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS)?
To find the cheapest airline that'll fly you from ATL to PSS, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS)?
You'll have to take a flight with a layover when traveling from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from ATL to PSS?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary depending on a number of factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS)?
To land at Libertador General Jose de San Martin Airport (PSS) without delays, select a flight that leaves Hartsfield-Jackson Atlanta Intl. Airport (ATL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS) last-minute?
Waiting until just before your trip to book your flight from ATL to PSS often results in higher prices. While it's possible to find some last-minute deals, they're not always guaranteed. Be flexible with your travel plans to boost your chances of scoring a bargain.
Is it cheaper to book an ATL to PSS flight and hotel package?
Securing an ATL to PSS flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our wide range of hotels and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Libertador General Jose de San Martin Airport (PSS)?
If you booked your ATL to PSS flight within the last 24 hours, you may be able to cancel or modify it without 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 if you want more information.

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*Available to One Key members.