The calculated distance (air line) between Áyios Konstandínos and Ioánnina is approximately 77 miles respectively 124 kilometers.
By car or train, the actual journey to Ioánnina is certainly longer, as only the direct route (as the crow flies) between Áyios Konstandínos and Ioánnina has been calculated here.
Air line (approximately)
124 kilometers
67 nautical miles