Canberra to Sydney from $139 Return on Virgin Australia (dates in Feb-Mar) @ FlightScout
Virgin has a sale on this route and as a comparison, when I used to travel between the two regularly, these flights would cost $120 each way at best. So for $139 return it's a steal!
From: Canberra to Sydney Return
FF program: Velocity
Example: 11 Feb 2019 - 21 Feb 2019