The calculated distance (air line) between Bentota and Dehiwala-Mount Lavinia is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Dehiwala-Mount Lavinia is certainly longer, as only the direct route (as the crow flies) between Bentota and Dehiwala-Mount Lavinia has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles