When flying from Phuket City to Bozeman, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
HKT stands for Phuket City Airport, while BZN stands for Bozeman Gallatin Field Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.