The calculated distance (air line) between Néa Chalkidóna and Keratsíni is approximately 8 miles respectively 12 kilometers.
By car or train, the actual journey to Keratsíni is certainly longer, as only the direct route (as the crow flies) between Néa Chalkidóna and Keratsíni has been calculated here.
Air line (approximately)
12 kilometers
7 nautical miles