The calculated distance (air line) between Sri Jayewardenepura Kotte and Puttalam is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Puttalam is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Puttalam has been calculated here.
Air line (approximately)
129 kilometers
69 nautical miles