The calculated distance (air line) between Néa Moudhaniá and Korydallós is approximately 157 miles respectively 253 kilometers.
By car or train, the actual journey to Korydallós is certainly longer, as only the direct route (as the crow flies) between Néa Moudhaniá and Korydallós has been calculated here.
Air line (approximately)
253 kilometers
137 nautical miles