The calculated distance (air line) between Ottawa and Saint-Jean-sur-Richelieu is approximately 118 miles respectively 191 kilometers.
By car or train, the actual journey to Saint-Jean-sur-Richelieu is certainly longer, as only the direct route (as the crow flies) between Ottawa and Saint-Jean-sur-Richelieu has been calculated here.
Air line (approximately)
191 kilometers
103 nautical miles