The calculated distance (air line) between Palaió Fáliro and Korydallós is approximately 5 miles respectively 8 kilometers.
By car or train, the actual journey to Korydallós is certainly longer, as only the direct route (as the crow flies) between Palaió Fáliro and Korydallós has been calculated here.
Air line (approximately)
8 kilometers
4 nautical miles