The calculated distance (air line) between Catral and Sant Joan d'Alacant is approximately 26 miles respectively 42 kilometers.
By car or train, the actual journey to Sant Joan d'Alacant is certainly longer, as only the direct route (as the crow flies) between Catral and Sant Joan d'Alacant has been calculated here.
Air line (approximately)
42 kilometers
22 nautical miles