Take bus AP1 at ferry terminal to Macau Airport. You need to arrive at the ferry terminal of Hong Kong (China Ferry Terminal in Tsim Sha Tsui and HK-Macau Ferry Termianl in Sheung Wan both okay)at least 30 minutes. It is about one hour from Hong Kong to Macau and another 30 minutes by the airport bus to Macau Airport, and reach the airport 1-1.5 hours before flight departure. You can decide the ferry according to this, for there are many ferry ships a day and I have no idea of yout flight time. Get down at new Macau Ferry Terminal. There are also ferry to Taipa Temporary Ferry Terminal which is much near to Macau Hotel. You can just take a taxi to the airport after touching down.