Distance between hongkong international airport to Ferry terminal for Macau.

Hi, ferries for the journey can be taken at both China Ferry Terminal and HK-Macau Ferry Teminal at Sheung Wan. Which one do you refer to?

Anyway, shuttle bus may not be good choice to either of them.
To China Ferry Terminal, you can take Express train to Kowloon Station. Then walk to KOWLOON RAILWAY STATION BUS TERMINUS to take bus no. 215X to AUSTIN ROAD, which is within walking distance to your destination. The whole journwy takes 45min.

To HK-Macau Ferry Terminal, it is best to take Express Train to HK Station/Central Station, where transfer to Island MTR Line to Sheung Wan and walk there then. It takes around 40min for the whole journey.