Couple of points for the OP to consider...
First, WestJet is only showing their discount fares from YOW to MCO at the moment for dates between January 9th and March 5th. I expect the sale fares for end of March to May will be released after their "boxing week" so-called sale is completed. Last year, I recall this being in mid to late January.
Second - it's HIGHLY unlikely you will find a "sale" fare with WestJet from YOW to MCO (return) on any day outside of Tuesday, Wednesday and Thursday. This is due to the fact those days offer the direct flights (which are what go on sale), are low traffic days, and WJ needs to boost seat occupancy.
So, I would continue to watch the WestJet and A/C websites if you really want to fly out of YOW. If you want to peek around at the Syracuse option, I might suggest running a seach on
http://www.kayak.com
I'm NOT a WestJet employee - just someone who watches their fares for excuses to visit WDW