The calculated distance (air line) between Ratnapura and Sri Jayewardenepura Kotte is approximately 37 miles respectively 59 kilometers.
By car or train, the actual journey to Sri Jayewardenepura Kotte is certainly longer, as only the direct route (as the crow flies) between Ratnapura and Sri Jayewardenepura Kotte has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles