How do you get from Hong Kong to Guangzhou? You can take a plane, a train, a bus, or a ship.
1. By Bus
You can take a bus from Hong Kong Airport to the city center every 20 minutes from 8:00 a.m. to 8:00 p.m.
Duration: about 4 hours, Price: HK$110
https://www.hongkongairport.com/en/transport/mainland-connection/mainland-coaches/index.page
2. By Train
a.
Taxi or Metro to Hong Kong Hung Hom Station, then by train to Guangzhou East Station.
Duration: 1 hour and 50 minutes, Price: HK$190
https://www.it3.mtr.com.hk/b2c/frmIndex.asp?strLang=Eng
b.
Metro to Kowloon then Express Railway
Duration: 1 hour, Price: HK$250
https://www.highspeed.mtr.com.hk/en/main/index.html
3, By Air.
Guangzhou Baiyun International Airport(CAN) is located at the junction of Renhe Town in Baiyun District, XinhuaStreet, Huashan Town and Huadong Town in Huadu District, approximately 45 kilometers away from Canton Fair Complex. Every day thousands of flights bound for places all over the world. The airport is convenient with shuttle buses running back and forth in urban areas. Metro and expressways are easily connected with Canton Fair Complex.
http://www.baiyunairport.com/en/web/guest/byhome
Airport to the Canton Fair Complex
4. By Ferry
From Hong Kong Airport every 10:30 15:20 18:40
Not suggest, not sure when open after covid.
After get to Guangzhou, you can taxi or Metro to Canton Fair Complex: Take Metro Line 3 (in the direction of Panyu Square Station) to Kecun Station, change to Line 8 (in the direction of Wansheng Wei Station) , and exit at Xingang Dong Station (for Area A) or Pazhou Station (for Area B or C).