The calculated distance (air line) between Kalampáka and Néa Smýrni is approximately 166 miles respectively 266 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Kalampáka and Néa Smýrni has been calculated here.
Air line (approximately)
266 kilometers
144 nautical miles