The calculated distance (air line) between Áyios Konstandínos and Néa Ionía is approximately 134 miles respectively 216 kilometers.
By car or train, the actual journey to Néa Ionía is certainly longer, as only the direct route (as the crow flies) between Áyios Konstandínos and Néa Ionía has been calculated here.
Air line (approximately)
216 kilometers
117 nautical miles