The calculated distance (air line) between Áyios Konstandínos and Acharnés is approximately 132 miles respectively 212 kilometers.
By car or train, the actual journey to Acharnés is certainly longer, as only the direct route (as the crow flies) between Áyios Konstandínos and Acharnés has been calculated here.
Air line (approximately)
212 kilometers
115 nautical miles