St. Catharines is located in Ontario city, Canada at the 43.1713, -79.2427 coordinates. Distance from St. Catharines to other cities. are listed below, click on the city name to find distance between. Distance from St. Catharines to Toronto 60 km, to Ottawa 376 km, to Mississauga 56 km. The green marker indicates the location of St. Catharines.