The calculated distance (air line) between Staryya Darohi and Navapolatsk is approximately 173 miles respectively 278 kilometers.
By car or train, the actual journey to Navapolatsk is certainly longer, as only the direct route (as the crow flies) between Staryya Darohi and Navapolatsk has been calculated here.
Air line (approximately)
278 kilometers
150 nautical miles