Yes, it depends on where you are in Huadu. The north extension of Line 3 goes to Huadu Airport. As for how much money you said, you can&;t answer, without your starting point. Guangzhou is so wide. From downtown Guangzhou to Huadu, it takes about 40 minutes! Take the subway to Huadu. I suggest you get off at Renhe Station. Compared with the airport, there are more buses.