The calculated distance (air line) between Guardamar del Segura and Callosa de Segura is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Callosa de Segura is certainly longer, as only the direct route (as the crow flies) between Guardamar del Segura and Callosa de Segura has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles