If you are planning you trip to Australia to escape the Canadian winter Qantas is offering cheap airfares to Cairns, Australia from both Toronto and Vancouver. These speicals are for outbound departures between 14 November and 29 November 2009 or between 17 February and 8 June 2010 and the sale ends on November 6th, 2009.
Vancouver to Cairns from C$1298
Toronto to Cairns from C$1598
For more details and conditions please refer to the Qantas website. Make sure you book your great personal experience on the Great Barrier Reef.