The calculated distance (air line) between Polatsk and Plyeshchanitsy is approximately 83 miles respectively 133 kilometers.
By car or train, the actual journey to Plyeshchanitsy is certainly longer, as only the direct route (as the crow flies) between Polatsk and Plyeshchanitsy has been calculated here.
Air line (approximately)
133 kilometers
72 nautical miles