The calculated distance (air line) between Néa Erythraía and Kalamariá is approximately 178 miles respectively 287 kilometers.
By car or train, the actual journey to Kalamariá is certainly longer, as only the direct route (as the crow flies) between Néa Erythraía and Kalamariá has been calculated here.
Air line (approximately)
287 kilometers
155 nautical miles