In general when looking for the cheapest flight to Florianopolis, try to book your flight during the month of July for the best deal.
In general, booking your departure to Florianopolis for a Thursday represents the best deal on airfare. Try to avoid a Saturday departure to stay away from the highest prices.
Typically, cheap prices to Florianopolis are most often found for morning flights. Cheap prices are less likely for afternoon flights.