Question : Should you take that vacation to Sao Paulo in the next 30 days?
Answer : Since low prices are preferred, look at December 14th. As of December 5th, the cheapest ticket sales are coming in 16% below the average price for this route, so you can spend that extra money on an adventure in Sao Paulo.
Question : How long do most people stay in Sao Paulo when they fly in from Raleigh?
Answer : Of course you're not most people, but if you were, you'd stay roughly 17 days.
Question : Is price more important than specific travel days for you?
Answer : Friday is your lowest-cost day to fly in December. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : How often are prices changing for this route?
Answer : Flight prices for RDU to GRU fluctuate a lot more than most. Remember, you can save by booking further in advance.