The calculated distance (air line) between Sri Jayewardenepura Kotte and Wattala is approximately 7 miles respectively 12 kilometers.
By car or train, the actual journey to Wattala is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Wattala has been calculated here.
Air line (approximately)
12 kilometers
6 nautical miles