The calculated distance (air line) between Qala i Naw and Sar-e Pul is approximately 179 miles respectively 288 kilometers.
By car or train, the actual journey to Sar-e Pul is certainly longer, as only the direct route (as the crow flies) between Qala i Naw and Sar-e Pul has been calculated here.
Air line (approximately)
288 kilometers
155 nautical miles