The calculated distance (air line) between Le Mans and Château-du-Loir is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Château-du-Loir is certainly longer, as only the direct route (as the crow flies) between Le Mans and Château-du-Loir has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles