The calculated distance (air line) between Mashtūl as Sūq and Hihyā is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Hihyā is certainly longer, as only the direct route (as the crow flies) between Mashtūl as Sūq and Hihyā has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles