The calculated distance (air line) between Puyang Chengguanzhen and Tianchang is approximately 168 miles respectively 270 kilometers.
By car or train, the actual journey to Tianchang is certainly longer, as only the direct route (as the crow flies) between Puyang Chengguanzhen and Tianchang has been calculated here.
Air line (approximately)
270 kilometers
146 nautical miles