Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Savannah to Curaçao as you normally would.
Savannah/Hilton Head (SAV) is the airport you will fly out of if you book a flight from Savannah to Curaçao. It is only a 7.4 mi journey to Savannah/Hilton Head (SAV) from Savannah’s city center.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Savannah/Hilton Head Airport to Willemstad Hato Int. Airport flight would often be abbreviated as a SAV to CUR flight.