From De'an, take the K790 train to Xinyang, take the train from Xinyang to Zhengzhou (Xinyang to Zhengzhou train is a lot, any one on the line), Xinyang to Zhengzhou hard seat fare 24, 41, 47 yuan.
K790 Nanchang - Xi'an De'an 20:35 Xinyang 03:21 running 6 hours 46 minutes hard seat fare 73 yuan