Hi Koliany

Greeting from Peggy, Top China Travel.

From my experience, the best way from Guilin to Zhangjiajie is private transfer + train. The operation likes the following:
Firstly - A private transferring from Guilin city to Liuzhou train station
Secondly - Take the overnight train from Liuzhou to Zhangjiajie
It will be the comparative comfortable and cheap way between these two cities.

And there is no direct flight from Guilin to Zhangjiajie. If you want to take flight, you need to have a route: Guilin - Guangzhou - Zhangjiajie. But this route is expensive because you need t pay two parts flight tickets.

And there is no direct train also. Only Liuzho - Zhangjiajie direct train can be arranged. From Guilin to Liuzhou, there is also bullet train. But not as convinint as a private transferring service.

Thanks for you reading! If you would like to book the transferring service, you can let me know:
!) When do you need to book?
2) How many people will travel together?

Peggy