The calculated distance (air line) between Al Ḩudaydah and Laḩij is approximately 177 miles respectively 284 kilometers.
By car or train, the actual journey to Laḩij is certainly longer, as only the direct route (as the crow flies) between Al Ḩudaydah and Laḩij has been calculated here.
Air line (approximately)
284 kilometers
153 nautical miles