Take Kunming bus to Luxi Bus Station, get off at Xindong Station, take bus No.60 to Kunming Railway Station, and then take the train to Shanghai Railway Station. It takes more than 40 hours to sit. Generally speaking, it costs a little more than 500 to make a hard berth. I suggest you fly. It will cost more than 500 yuan after the 20th. I will also go to Shanghai on the 24th. The air tickets are all booked, and even the construction cost on the plane is tens of dollars more expensive than the train. You have to eat on the train for more than 40 hours. Might as well fly.