The calculated distance (air line) between Gampaha and Sri Jayewardenepura Kotte is approximately 15 miles respectively 25 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 Gampaha and Sri Jayewardenepura Kotte has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles