The calculated distance (air line) between Áyios Konstandínos and Kalamariá is approximately 158 miles respectively 254 kilometers.
By car or train, the actual journey to Kalamariá is certainly longer, as only the direct route (as the crow flies) between Áyios Konstandínos and Kalamariá has been calculated here.
Air line (approximately)
254 kilometers
137 nautical miles