The calculated distance (air line) between Alicante and Castelló de la Plana is approximately 116 miles respectively 186 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 Alicante and Castelló de la Plana has been calculated here.
Air line (approximately)
186 kilometers
100 nautical miles