This probably isn't going to help you this time, but if you plan to go to WDW often over the years, start studying the rates by all the carriers that fly out of all the airports you might use. We've been flying from NorthEast PA since 1999, yearly if not more often, from PHL, ERW and AVP and I watch carriers out of these airports and others starting 330 days before our trip dates, that's the earliest any carrier releases their fares.
Over time, I've come to know what a 'good' rate out of Philly, for instance, and one year I did book 330 days out when I saw that their first offering, USAir it was, was a 'good' rate. Usually, we find the best rates for our many March trips in the Sept - Oct time frame. I'd be looking to lock something up now if I were you. Post a note here asking the best rate folks have gotten for March trips out of the airport(s) you plan to use then book based on these answers.
Bill From PA