The calculated distance (air line) between Chernihiv and Kastsyukowka is approximately 73 miles respectively 118 kilometers.
By car or train, the actual journey to Kastsyukowka is certainly longer, as only the direct route (as the crow flies) between Chernihiv and Kastsyukowka has been calculated here.
Air line (approximately)
118 kilometers
63 nautical miles