The calculated distance (air line) between Tangalle and Sri Jayewardenepura Kotte is approximately 85 miles respectively 137 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 Tangalle and Sri Jayewardenepura Kotte has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles