We are hoping to go end of May/first of June. I have been watching airfare and so far it hasn't changed. (Dallas to Orlando, non-stop on American.)
We have pretty specific times and days we need to fly. If you are flexible OR if you are already planning to fly on Tuesday or Wednesday you might want to wait. Flights on Tuesday and Wednesday always seem to end up being discounted closer to the time of departure.
I got some e-mails from Travelocity with lower rates, but they were ALL for travel before March 1. I am not one to gamble on airfare. As soon as we have our dates nailed down I will book airfare and be done with it. The absolute lowest fares I have seen are about $50 per ticket less than what the airline currently has listed. For me, it isn't worth gambling on availability to save $150 on 3 tickets. I would rather KNOW we have seats on our preferred flights and not have to fly into Orlando at 2 AM or travel mid-week.
Good luck! Airfare prices drive me up the wall!