The calculated distance (air line) between Psachná and Néa Smýrni is approximately 44 miles respectively 71 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Psachná and Néa Smýrni has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles