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