The calculated distance (air line) between Árta and Néa Smýrni is approximately 170 miles respectively 273 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Árta and Néa Smýrni has been calculated here.
Air line (approximately)
273 kilometers
147 nautical miles