The calculated distance (air line) between Néa Michanióna and Korydallós is approximately 176 miles respectively 284 kilometers.
By car or train, the actual journey to Korydallós is certainly longer, as only the direct route (as the crow flies) between Néa Michanióna and Korydallós has been calculated here.
Air line (approximately)
284 kilometers
153 nautical miles