The calculated distance (air line) between Aspe and Sant Joan d'Alacant is approximately 18 miles respectively 30 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 Aspe and Sant Joan d'Alacant has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles