Due to multiple factors, expect to potentially pay more when booking in December. For low rates, August can be a great choice for travel to Ponce. Flights to Ponce from Pensacola in August are about $403 on average during August, but can be found for as low as $273.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pensacola to Ponce as you normally would.