Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Indonesia to Cape Verde as you normally would.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Denpasar Bali Ngurah Rai Airport to Praia Nelson Mandela Airport flight would often be abbreviated as a DPS to RAI flight. Espargos Amilcar Cabral Intl Airport (SID), Rabil Airport (BVC), San Pedro Airport (VXE), Sao Nicolau Preguiça Airport (SNE), São Filipe Airport (SFL) are some additional IATA codes for airports related to your trip.