The calculated distance (air line) between Dehiwala-Mount Lavinia and Anuradhapura is approximately 108 miles respectively 174 kilometers.
By car or train, the actual journey to Anuradhapura is certainly longer, as only the direct route (as the crow flies) between Dehiwala-Mount Lavinia and Anuradhapura has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles