The calculated distance (air line) between Chartres-de-Bretagne and Montfort-sur-Meu is approximately 13 miles respectively 22 kilometers.
By car or train, the actual journey to Montfort-sur-Meu is certainly longer, as only the direct route (as the crow flies) between Chartres-de-Bretagne and Montfort-sur-Meu has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles