Avianca Airlines have round trip airfares travelling from Orlando (MCO) to Rio de Janeiro Brazil (GIG) for $592-$626, including taxes and fees. This makes 1 stop.
Departs MIA: Aug 8-9, 11-31; Sept 1-19, 25-27, 30; Oct 1-6, 8-11, 17-31; Nov 1-16
Returns: wide and good availability thru Nov 29
Use the dates and plug it in Skyscanner [skyscanner.com]
to get your choices of the lowest fares with your favorite OTA. For hotels, check Hotwire's Hot Rates [hotwire.com]