The calculated distance (air line) between Elefthério - Kordelió and Chalkída is approximately 157 miles respectively 252 kilometers.
By car or train, the actual journey to Chalkída is certainly longer, as only the direct route (as the crow flies) between Elefthério - Kordelió and Chalkída has been calculated here.
Air line (approximately)
252 kilometers
136 nautical miles