When flying from Kota Kinabalu to Solomon Islands, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Kota Kinabalu (BKI), located 5.8 km from the city centre, is the airport you fly out of when you book flights from Kota Kinabalu to Solomon Islands.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Kota Kinabalu Airport to Honiara Henderson Intl Airport flight would often be abbreviated as a BKI to HIR flight. Gizo Island Airport (GZO), Nakumwe Kirakira Airport (IRA), Munda Airport (MUA), Ione Marau Sound Airport (RUS), Balalae Island Airport (BAS) are other airports near this flight route and their unique identifiers/IATA codes.