When flying from Jakarta to Alcúdia, 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 Palma de Mallorca Son Sant Joan Airport flight would often be abbreviated as a CGK to PMI flight.