The calculated distance (air line) between Sanaa and Al Ḩudaydah is approximately 92 miles respectively 148 kilometers.
By car or train, the actual journey to Al Ḩudaydah is certainly longer, as only the direct route (as the crow flies) between Sanaa and Al Ḩudaydah has been calculated here.
Air line (approximately)
148 kilometers
80 nautical miles