The calculated distance (air line) between Perugia and Castiglione del Lago is approximately 18 miles respectively 28 kilometers.
By car or train, the actual journey to Castiglione del Lago is certainly longer, as only the direct route (as the crow flies) between Perugia and Castiglione del Lago has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles