The calculated distance (air line) between Chilaw and Sri Jayewardenepura Kotte is approximately 48 miles respectively 78 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 Chilaw and Sri Jayewardenepura Kotte has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles