The calculated distance (air line) between Chartres-de-Bretagne and Saint-Berthevin is approximately 41 miles respectively 65 kilometers.
By car or train, the actual journey to Saint-Berthevin is certainly longer, as only the direct route (as the crow flies) between Chartres-de-Bretagne and Saint-Berthevin has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles