@mycroft_holmes, meron direct flight ang PAL to Brisbane. Meron din Malaysian Air, connecting flight. Pwede ka rin mag Cebupac (Manila-Sydney), yun pinakamura. Tapos domestic flight Sydney-Brisbane. I suggest that you check your travel dates on those airlines' webpage para mas magandang reference.
In our case, Adelaide ang destination namin. Pinakamura nakita namin is CebuPac for MNL-Sydney, then JetStar for Sydney-Adelaide. For 3 persons, nasa 25k yung CebuPac, tapos around 500Aud yung JetStar. Parehong merong 20kg baggage allowance na yun.