The calculated distance (air line) between Elassóna and Néa Smýrni is approximately 158 miles respectively 254 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Elassóna and Néa Smýrni has been calculated here.
Air line (approximately)
254 kilometers
137 nautical miles