The calculated distance (air line) between Mashtūl as Sūq and Aş Şaff is approximately 55 miles respectively 89 kilometers.
By car or train, the actual journey to Aş Şaff is certainly longer, as only the direct route (as the crow flies) between Mashtūl as Sūq and Aş Şaff has been calculated here.
Air line (approximately)
89 kilometers
48 nautical miles