The calculated distance (air line) between Al Ḩudaydah and Saḩar is approximately 97 miles respectively 156 kilometers.
By car or train, the actual journey to Saḩar is certainly longer, as only the direct route (as the crow flies) between Al Ḩudaydah and Saḩar has been calculated here.
Air line (approximately)
156 kilometers
84 nautical miles