The calculated distance (air line) between Zhangjiakou and Yangliuqing is approximately 160 miles respectively 258 kilometers.
By car or train, the actual journey to Yangliuqing is certainly longer, as only the direct route (as the crow flies) between Zhangjiakou and Yangliuqing has been calculated here.
Air line (approximately)
258 kilometers
139 nautical miles