Watertown International Airport (IATA: ART, ICAO: KART, FAA LID: ART) is a county owned, public use airport located in Jefferson County, New York, United States. It is located five nautical miles (6 mi, 9 km) west of the central business district of Watertown. The airport is mostly used for general aviation, but has scheduled passenger service provided by one commercial airline and subsidized by the Essential Air Service program.