The calculated distance (air line) between Perpignan and Castelló d'Empúries is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Castelló d'Empúries is certainly longer, as only the direct route (as the crow flies) between Perpignan and Castelló d'Empúries has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles