In general, when booking your flight to Sao Paulo, May is the cheapest month on average.
In general, most flyers find the cheapest time to book a flight to Sao Paulo is about 32 days prior.
On average, the cheapest flights to Sao Paulo are found when departing on a Tuesday. Try to avoid departing on a Saturday, as this is usually the most expensive day.
Typically, cheap prices to Sao Paulo are most often found for afternoon flights. Cheap prices are less likely for evening flights.