The U.S. Embassy is aware of commercial flight options on Aerolineas Argentinas to São Paulo on March 28, scheduled to depart at 2:00 pm and 3:00 pm from Ezeiza International Airport. Delta has a direct flight from São Paulo to Atlanta scheduled to depart March 28 at 9:50 pm
U.S. citizens are responsible for booking their own travel. You may need to book separate tickets on each carrier and use the Spanish site for Aerolineas Argentinas. Many scheduled flights have been cancelled, often with little advance notice.
Please visit https://ar.usembassy.gov/covid-19/ for information for travelers seeking to depart Argentina.