Very interesting prices can be found for flight from Singapore to Australia (Sydney, Melbourne and Brisbane). You can fly from 550 AUD return with one of the premium airlines (Etihad, Emirates or British Airways). Flying to Sydney with BA will cost you 550 AUD. Flights with Emirates and Ethiad can be found for ~600 AUD. The best prices are up to the end of May. For booking go to Bravofly , mytrip or British Airways website. All flights include meals and check in luggage.
Example of bookings: