The calculated distance (air line) between Romorantin-Lanthenay and Château-Renault is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to Château-Renault is certainly longer, as only the direct route (as the crow flies) between Romorantin-Lanthenay and Château-Renault has been calculated here.
Air line (approximately)
68 kilometers
37 nautical miles