The calculated distance (air line) between Néa Kallikráteia and Kallithéa is approximately 167 miles respectively 268 kilometers.
By car or train, the actual journey to Kallithéa is certainly longer, as only the direct route (as the crow flies) between Néa Kallikráteia and Kallithéa has been calculated here.
Air line (approximately)
268 kilometers
145 nautical miles