The calculated distance (air line) between Guardamar del Segura and Los Alcázares is approximately 26 miles respectively 42 kilometers.
By car or train, the actual journey to Los Alcázares is certainly longer, as only the direct route (as the crow flies) between Guardamar del Segura and Los Alcázares has been calculated here.
Air line (approximately)
42 kilometers
23 nautical miles