The calculated distance (air line) between Dehiwala-Mount Lavinia and Trincomalee is approximately 152 miles respectively 244 kilometers.
By car or train, the actual journey to Trincomalee is certainly longer, as only the direct route (as the crow flies) between Dehiwala-Mount Lavinia and Trincomalee has been calculated here.
Air line (approximately)
244 kilometers
132 nautical miles