My flt frm kul to Xianyang Aiport will arr 11.00 pm.

Well, according to your arrival time, you need to take Xishaomen Line, and get off at Xishaomen Airport Business Hotel first. It takes around an hour on the way. And the ticket fare is CNY 25 per person. After arriving, take a taxi to the hotel directly. The cab fare is about CNY 20 at night.