The calculated distance (air line) between Nāḩiyat al Fuhūd and Ḩawallī is approximately 137 miles respectively 221 kilometers.
By car or train, the actual journey to Ḩawallī is certainly longer, as only the direct route (as the crow flies) between Nāḩiyat al Fuhūd and Ḩawallī has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles