Watertown International Airport (IATA: ART[3], ICAO: KART, FAA LID: ART) is in the Town of Hounsfield in Jefferson County, New York, United States,[1] 6 mi (5.2 nmi; 9.7 km) west of Watertown.

[6] It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2023–2027, in which it is categorized as a non-hub primary commercial service facility.

[7] On July 12, 2024, a Boeing C-17 Globemaster III from the 732nd Airlift Squadron landed at Watertown International Airport and stayed for two days before leaving.

[1] In the 12-month period ending June 30, 2022, the airport had 49,786 aircraft operations, average 136 per day: 66% general aviation, 29% military, 3% airline, and 2% air taxi.

Additionally, renovation work of baggage systems and passenger waiting areas was necessary to accommodate the new service, which cost nearly one million dollars.