Cheyenne County Municipal Airport (ICAO: KSYF, FAA LID: SYF) is a public airport located one mile (2 km) south of the central business district of St. Francis, a city in Cheyenne County, Kansas, United States. This airport is publicly owned by City of St. Francis.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Cheyenne County Municipal Airport is assigned SYF by the FAA but has no designation from the IATA (which assigned SYF to Silva Bay on Gabriola Island in British Columbia, Canada). The airport's ICAO identifier is KSYF.