The calculated distance (air line) between Néa Michanióna and Keratsíni is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to Keratsíni is certainly longer, as only the direct route (as the crow flies) between Néa Michanióna and Keratsíni has been calculated here.
Air line (approximately)
286 kilometers
154 nautical miles