The calculated distance (air line) between Néa Erythraía and Keratsíni is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Keratsíni is certainly longer, as only the direct route (as the crow flies) between Néa Erythraía and Keratsíni has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles