The calculated distance (air line) between Ágios Stéfanos and Keratsíni is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Keratsíni is certainly longer, as only the direct route (as the crow flies) between Ágios Stéfanos and Keratsíni has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles