The calculated distance (air line) between Ḩalwān and Mashtūl as Sūq is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Mashtūl as Sūq is certainly longer, as only the direct route (as the crow flies) between Ḩalwān and Mashtūl as Sūq has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles