Jiuzhaigou, huanglong, then xi'an

My plan is on 16 oct' 15 go to jiuzhaigou from chengdu by bus...then next day 17'oct spend whole in jiuzhaigou..18' from jiuzhaigou to Huang long.. After huanglong want to go airport want to fly to xi'an... Is it possible if I take evening flight?how to go jiuhuang airport from huanglong? How long does it take and the fare if by taxi..thanks