The calculated distance (air line) between Sri Jayewardenepura Kotte and Devinuwara is approximately 81 miles respectively 130 kilometers.
By car or train, the actual journey to Devinuwara is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Devinuwara has been calculated here.
Air line (approximately)
130 kilometers
70 nautical miles