Metro connection between Guangzhou South Railway station to Baiyun intl airport.

Yes, there are metro lines connecting the two spots, but I’m afraid you cannot use it. Your flight is at 08:05, and you need to reach the airport at least 2 hours in advance, and the subway ride needs 70 mins at least. In such case, the metro hasn’t begun operating.

So you are suggested to take a taxi to the Aoyuan Golf Hotel, about 3.8 miles from the train station. In front of the hotel, you can take airport shuttle bus Line 7B to the airport. The first bus departs at 05:45, hope you can catch that.