Any direct transport from Hongkong Kowloon station to Guangzhou Baiyun Airport?

Hi, Pandy. There is no direct transport from Kowloon to Baiyun Airport. You may take bus line 8 from Kowloon Railway Station Bus Terminus, and get off at Hung Hom Railway Station. Next, take a train to GZ East Railway Station for HKD 210. The train is available from 7:25 to 20:01, and the duration is about 2 hours. Upon arrival, take subway line 3, and get off at Airport South Station. Follow the clear guiding signs and you can walk to the airport :)