The calculated distance (air line) between Agios Ioannis Rentis and Acharnés is approximately 9 miles respectively 14 kilometers.
By car or train, the actual journey to Acharnés is certainly longer, as only the direct route (as the crow flies) between Agios Ioannis Rentis and Acharnés has been calculated here.
Air line (approximately)
14 kilometers
8 nautical miles