The calculated distance (air line) between Sri Jayewardenepura Kotte and Kalmunai is approximately 137 miles respectively 221 kilometers.
By car or train, the actual journey to Kalmunai is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Kalmunai has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles