Good afternoon! Landlord!
Let&;s calculate the time first. You arrived in Guangzhou at 18: 45 by bullet train. In this case, I will give you 15 minutes to get out of the station and buy a ticket to enter the subway (hurry up). A rough estimate is the 7 o&;clock subway. From Guangzhou South to Airport South, you can buy the subway ticket for Airport South directly at Guangzhou South Subway Station, then take the subway directly to Jiahe Wanggang, and then transfer to Line 3 directly to Airport South. It&;s 26 stops for the whole journey. The fare is 10 yuan (prepare your own change). Then the time is one and a half hours. Then it is estimated that we will get to the airport before 8: 30 to 9: 00. If you can hurry up and move quickly after getting off the subway station, you can get on.
In addition to the subway, you can take a taxi or take a taxi from Guangzhou South Railway Station to the south of the airport. Time is also about an hour. But the risk is not knowing whether there will be traffic jams. The same is true for the airport bus. Although the price is cheaper, the time is similar, and you have to wait for the bus or something. Not very recommended.
To sum up, I think the subway is better at present.
All right! thank you I hope I can help you!