The calculated distance (air line) between Sevastopol and Bakhchysarai is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Bakhchysarai is certainly longer, as only the direct route (as the crow flies) between Sevastopol and Bakhchysarai has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles