The calculated distance (air line) between Áyios Konstandínos and Keratsíni is approximately 129 miles respectively 208 kilometers.
By car or train, the actual journey to Keratsíni is certainly longer, as only the direct route (as the crow flies) between Áyios Konstandínos and Keratsíni has been calculated here.
Air line (approximately)
208 kilometers
112 nautical miles