YYZ-YUL-YQB-YUL-YYZ

On my first try, I found a round trip for $427 on Dec 27. You might be able to do better. Too bad ... yesterday there were lots of 15% off codes that were being offered (now expired). That will give you 2000 status miles, plus there is currently a triple miles bonus on the YYZ-YUL route, so that will give you an additional 2000 miles.

AC400 Toronto, Pearson Int'l (YYZ)
Terminal 1 Montreal, Trudeau (YUL) Sun Dec-27 07:00 08:13

AC8708 Montreal, Trudeau (YUL) Quebec (YQB) Sun Dec-27 10:00 10:48

AC8727 Quebec (YQB) Montreal, Trudeau (YUL) Sun Dec-27 18:50 19:44

AC429 Montreal, Trudeau (YUL) Toronto, Pearson Int'l (YYZ)
Terminal 1 Sun Dec-27 21:00 22:20

Total charge for 1 adult
Departing Flight (Tango Plus) 150.00
Returning Flight (Tango Plus) 165.00
Options 0.00
Taxes, fees, charges and surcharges 112.18
Grand Total - Canadian dollars $427.18 CAD

And WELCOME to FT Canadiana!