The calculated distance (air line) between Néon Karlovásion and Néa Ionía is approximately 162 miles respectively 260 kilometers.
By car or train, the actual journey to Néa Ionía is certainly longer, as only the direct route (as the crow flies) between Néon Karlovásion and Néa Ionía has been calculated here.
Air line (approximately)
260 kilometers
140 nautical miles