When flying from Bali to Bolivia, 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 Denpasar Bali Ngurah Rai Airport to Santa Cruz de la Sierra Viru Viru Intl Airport flight would often be abbreviated as a DPS to VVI flight. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: La Paz El Alto Intl Airport (LPB), Cochabamba J Wilsterman Airport (CBB), Sucre Airport (SRE), Uyuni Joya Andina Airport (UYU), Tarija Airport (TJA).