The calculated distance (air line) between Sainte-Marthe-sur-le-Lac and Québec is approximately 157 miles respectively 253 kilometers.
By car or train, the actual journey to Québec is certainly longer, as only the direct route (as the crow flies) between Sainte-Marthe-sur-le-Lac and Québec has been calculated here.
Air line (approximately)
253 kilometers
137 nautical miles