Saint-Jean Airport, (IATA: YJN, ICAO: CYJN), is located in the southwestern section of the city of Saint-Jean-sur-Richelieu, Quebec, Canada. The airport handles general aviation traffic and is also the main site of the annual International Balloon Festival of Saint-Jean-sur-Richelieu. Summer also sees a major increase in the number of movements due to the Royal Canadian Air Cadets glider school held at the airport.
The airfield was constructed in 1941 as part of the British Commonwealth Air Training Plan. No. 9 AOS (Air Observers School) operated here from 7 July 1941 to 30 April 1945.