The calculated distance (air line) between Néa Kallikráteia and Kalamariá is approximately 20 miles respectively 31 kilometers.
By car or train, the actual journey to Kalamariá is certainly longer, as only the direct route (as the crow flies) between Néa Kallikráteia and Kalamariá has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles