From what i remember when i booked my Oct/Nov WDW trip...
I booked both the WDW package and airfare in late August. At that time WestJet was having a seat sale for about $400 roundtrip per person... that is if you left on a monday or tuesday. Any of the other weekdays, they were a bit more expensive, with Saturaday and Sunday depatures/arrivals being the most expensice. A few weeks later, Air Canada was having their seat sale for approximately the same price. So it's really all about timing.
Hope this helps