What is the correct city code for San Antonio?

The correct city code for San Antonio is SAT. This code is used consistently across various platforms, including ticketing systems, airport signage, and flight schedules, to uniquely identify San Antonio International Airport.

City codes typically consist of three-letter designations and are assigned in a way that often reflects the city or the airport's name. In the case of SAT, the code is derived from the first letters of 'San Antonio,' making it intuitive for travelers and industry professionals alike.

Other city codes listed in the options correspond to different airports: SDF is the code for Louisville, Kentucky; SLC represents Salt Lake City, Utah; and SAN refers to San Diego, California. Each of these codes serves to eliminate confusion among airports, especially in areas where multiple airports are located in close proximity. Thus, when referencing San Antonio, SAT is the universally recognized code to use.