The calculated distance (air line) between Sievierodonetsk and Chasiv Yar is approximately 38 miles respectively 61 kilometers.
By car or train, the actual journey to Chasiv Yar is certainly longer, as only the direct route (as the crow flies) between Sievierodonetsk and Chasiv Yar has been calculated here.
Air line (approximately)
61 kilometers
33 nautical miles