We fly out of TO since we want a direct flight. We can save a few extra $$ by driving to the States but having connecting flights, chances of flight changes or cancellations and the extra chances of missing luggage due to connections etc keeps us flying with A/C or WJ. Round trip on either one or down on one and back on the other...doesn't matter as long as the prices are good and the flight times were what we want. Sometimes WJ is slow in the spring/early summer putting their prices out for the following year.
We would consider driving to Hamilton, Kitchener or London if they had competitive regular direct flights to MBJ in the future.