Xian South Railway Station

You can take bus 605, 616, 36, 704, 12 or 323 to Weier Street, then change to 920Jiaodai or 920 Tangyu to that station. It takes about 1.5 hours or even more if the road condition is not good. If by taxi, it takes about 60 minutes and CNY 70.

BTW, why don't you go to the main railway station, it is much closer and the schedule is denser. From your hotel, you can walk to Nanshaomen to take bus 40, 258, 603 or 14 to get there. It is only six-stop away.