If you can get a flight from Rio to Guarulhos (GRU) that would be your easiest solution. There are shuttle flights between RIO & GRU roughly every 30-45 minutes; and they're inexpensive (about $45 USD one way). The other airport is mid-town (Literally!!). There is a shuttle bus between both airports, but depending on the time of day, you're looking at about 1.25-1.5 hours minimum. I've done this trip...it was fine...you get picked up and dropped off at the main entrance to each airport; you just need to budget your time appropriately...if you're in rush hour; which in Sao Paolo is probably 0500-0930 and 1630-1930 I would allow approximately 2 hours for the trip.

Cheers,

John Wiernikowski Hamilton, ON CANADA