The calculated distance (air line) between Néon Karlovásion and Néa Smýrni is approximately 163 miles respectively 263 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Néon Karlovásion and Néa Smýrni has been calculated here.
Air line (approximately)
263 kilometers
142 nautical miles