Watertown International Airport 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. The airport does not provide any scheduled international passenger flights, but is available as an international port of entry for private aircraft on two hours advance notice to customs from pilots.