The calculated distance (air line) between Salamína and Néa Smýrni is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Salamína and Néa Smýrni has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles