The calculated distance (air line) between Sri Jayewardenepura Kotte and Kandy is approximately 57 miles respectively 92 kilometers.
By car or train, the actual journey to Kandy is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Kandy has been calculated here.
Air line (approximately)
92 kilometers
50 nautical miles