20.7 kilometers.

According to Baidu Map, it is 20.7 kilometers from Fushun South Station to Zhangdang, and the whole journey takes 1 hour and 40 minutes. The specific route: 1. First walk 390 meters to reach Zhangdang.

2. Next, take bus No. 20, go through 30 stops, and arrive at South Station (East Second Street).

3. Finally walk 700 meters to Fushun South Station.