The calculated distance (air line) between Yuen Long Kau Hui and Huicheng is approximately 149 miles respectively 240 kilometers.
By car or train, the actual journey to Huicheng is certainly longer, as only the direct route (as the crow flies) between Yuen Long Kau Hui and Huicheng has been calculated here.
Air line (approximately)
240 kilometers
130 nautical miles