What is the best way to go Zhangjiajie from Xi'an?

Well, you are suggested to take the direct plane. The duration is only about 1.5 hours. There are two schedules every day. Upon getting to Zhangjiajie, take a taxi to reach or go to city center and transfer to a coach.

Or you can take high-speed train from North Railway Station, and go to Changsha South Railway Station. It takes nearly 6 hours. Then walk south to arrive at Lituo Bus Station. There are several buses that can take you to Zhangjiajie Bus Station. After that, hire a private car or take direct coach to arrive at the scenic area.