The calculated distance (air line) between Néa Michanióna and Kallithéa is approximately 179 miles respectively 289 kilometers.
By car or train, the actual journey to Kallithéa is certainly longer, as only the direct route (as the crow flies) between Néa Michanióna and Kallithéa has been calculated here.
Air line (approximately)
289 kilometers
156 nautical miles