The calculated distance (air line) between Sri Jayewardenepura Kotte and Welisara is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Welisara is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Welisara has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles