The calculated distance (air line) between Sri Jayewardenepura Kotte and Dambulla is approximately 85 miles respectively 136 kilometers.
By car or train, the actual journey to Dambulla is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Dambulla has been calculated here.
Air line (approximately)
136 kilometers
73 nautical miles