The calculated distance (air line) between Orihuela and Guardamar del Segura is approximately 16 miles respectively 25 kilometers.
By car or train, the actual journey to Guardamar del Segura is certainly longer, as only the direct route (as the crow flies) between Orihuela and Guardamar del Segura has been calculated here.
Air line (approximately)
25 kilometers
14 nautical miles