The calculated distance (air line) between Néa Chalkidóna and Kalamariá is approximately 181 miles respectively 292 kilometers.
By car or train, the actual journey to Kalamariá is certainly longer, as only the direct route (as the crow flies) between Néa Chalkidóna and Kalamariá has been calculated here.
Air line (approximately)
292 kilometers
158 nautical miles