The calculated distance (air line) between Ágios Athanásios and Chalkída is approximately 162 miles respectively 261 kilometers.
By car or train, the actual journey to Chalkída is certainly longer, as only the direct route (as the crow flies) between Ágios Athanásios and Chalkída has been calculated here.
Air line (approximately)
261 kilometers
141 nautical miles