The calculated distance (air line) between Mourniés and Néa Smýrni is approximately 171 miles respectively 275 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Mourniés and Néa Smýrni has been calculated here.
Air line (approximately)
275 kilometers
148 nautical miles