The calculated distance (air line) between Néa Kallikráteia and Agios Dimitrios is approximately 168 miles respectively 271 kilometers.
By car or train, the actual journey to Agios Dimitrios is certainly longer, as only the direct route (as the crow flies) between Néa Kallikráteia and Agios Dimitrios has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles