COPA and Avianca have round-trip flights from New York (JFK) to Sao Paulo (GRU) for $521-$569 with a connection. Flights February to June. Very few weekends available. Origin/Destination reversible.
Some small OTAs on Skyscanner and Google have this for cheaper than the airline. If you plan on booking there, beware of any site that charges a fee to cancel a ticket within the 24-hour “free” period. Use unknown booking sites at your own risk.
This is cheaper than the previous Sao Paulo fare that we mentioned, but that one was NONSTOP and this one has a connection.
Click for more details and booking links Cheap Flights: New York to/from Sao Paulo $521-$569 r/t [February-June] – COPA / Avianca