The calculated distance (air line) between Mahilyow and Kastsyukowka is approximately 98 miles respectively 158 kilometers.
By car or train, the actual journey to Kastsyukowka is certainly longer, as only the direct route (as the crow flies) between Mahilyow and Kastsyukowka has been calculated here.
Air line (approximately)
158 kilometers
85 nautical miles