What are the options (¥, time) for us to go from Kunming Airport to the South Railway Station?

Well, there is no direct airport shuttle bus can take you to the South Railway Station. Thus upon landing, you are advised to take shuttle bus line 4 to the New Area of Chenggong first. The duration is around 1.5 hours. The ticket fare is CNY 25 per person. Then walk to Chunrongjie Station and take subway line 1 (branch line) to the South Railway Station. In addition, the return way is the same.
For accommodation, you are advised to stay at the Airport Hotel. The location is the intersection of South Airport Road and East Airport Road. The price is CNY 300 per night in usual time.