Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Garden City, Kansas to Phoenix as you normally would.
For a flight from Garden City to Phoenix, you will be flying from Garden City Mnpl. Garden City Mnpl (GCK) is just 8.8 mi from the center of the city. Garden City Mnpl is the only Garden City airport and it handles 0 outbound flights to Phoenix per day. 1 airline has flights to Phoenix from Garden City Mnpl on a regular basis.
GCK stands for Garden City Mnpl Airport, while PHX stands for Phoenix Sky Harbor Intl 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. Phoenix-Mesa Gateway Airport (AZA), Prescott Airport (PRC) are some additional IATA codes for airports related to your trip.