The calculated distance (air line) between Chartres-de-Bretagne and Orléans is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Orléans is certainly longer, as only the direct route (as the crow flies) between Chartres-de-Bretagne and Orléans has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles