The calculated distance (air line) between Néa Filadélfeia and Chalkída is approximately 31 miles respectively 49 kilometers.
By car or train, the actual journey to Chalkída is certainly longer, as only the direct route (as the crow flies) between Néa Filadélfeia and Chalkída has been calculated here.
Air line (approximately)
49 kilometers
27 nautical miles