Louisville International Airport (IATA: SDF, ICAO: KSDF, FAA LID: SDF) is a public and military use public airport centrally located in the city of Louisville in Jefferson County, Kentucky, US. The airport covers 1,200 acres (4.9 km²) and has three runways. Its IATA airport code, SDF, is based on the airport's former name, Standiford Field.