Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sioux Falls to Branson as you normally would.
FSD stands for Sioux Falls Joe Foss Field Airport, while BKG stands for Branson 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.