The calculated distance (air line) between Agios Dimitrios and Néa Ionía is approximately 7 miles respectively 12 kilometers.
By car or train, the actual journey to Néa Ionía is certainly longer, as only the direct route (as the crow flies) between Agios Dimitrios and Néa Ionía has been calculated here.
Air line (approximately)
12 kilometers
6 nautical miles