The calculated distance (air line) between Sri Jayewardenepura Kotte and Ja Ela is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Ja Ela is certainly longer, as only the direct route (as the crow flies) between Sri Jayewardenepura Kotte and Ja Ela has been calculated here.
Air line (approximately)
21 kilometers
12 nautical miles