When flying from Jakarta to Marbella, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Jakarta Soekarno-Hatta Intl Airport to Malaga Airport flight would often be abbreviated as a CGK to AGP flight. Sevilla Airport (SVQ), Jerez de la Frontera La Parra Airport (XRY), Granada Federico Garcia Lorca Airport (GRX) are some additional IATA codes for airports related to your trip.