The calculated distance (air line) between Palma and Castelló de la Plana is approximately 146 miles respectively 235 kilometers.
By car or train, the actual journey to Castelló de la Plana is certainly longer, as only the direct route (as the crow flies) between Palma and Castelló de la Plana has been calculated here.
Air line (approximately)
235 kilometers
127 nautical miles