The calculated distance (air line) between Áyios Konstandínos and Thessaloníki is approximately 161 miles respectively 259 kilometers.
By car or train, the actual journey to Thessaloníki is certainly longer, as only the direct route (as the crow flies) between Áyios Konstandínos and Thessaloníki has been calculated here.
Air line (approximately)
259 kilometers
140 nautical miles