The calculated distance (air line) between Ágios Stéfanos and Kallithéa is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Kallithéa is certainly longer, as only the direct route (as the crow flies) between Ágios Stéfanos and Kallithéa has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles