The calculated distance (air line) between Áyios Konstandínos and Glyfáda is approximately 139 miles respectively 223 kilometers.
By car or train, the actual journey to Glyfáda is certainly longer, as only the direct route (as the crow flies) between Áyios Konstandínos and Glyfáda has been calculated here.
Air line (approximately)
223 kilometers
120 nautical miles