United has round-trip flights from Dallas (DFW) to Sao Paulo (GRU) for $535 with a connection. Flights November to August. No Holidays.
Note: Some small OTAs on SkyScanner have this for a bit cheaper on flights with inferior routing and long stopovers. Not really worth it in our opinion. 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.
Note: Fare is “Regular Economy” and allows for free checked/carry-on bags and seat selection.