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