When flying from Palawan to Byron Bay, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
This is defined as Puerto Princesa Airport (PPS) and Brisbane Airport (BNE). Codes like Brisbane Airport are often used to just call airports uniquely. Coolangatta Gold Coast Airport (OOL), Ballina Byron Airport (BNK), Lismore Airport (LSY), Grafton Airport (GFN) are other airports near this flight route and their unique identifiers/IATA codes.