It's pretty crazy how quickly fares can change once your travel date gets closer. We're heading to WDW in a few weeks, and we started looking for airfare out of ORD at the beginning of December and prices were approx $287 on United, which was a decent price but I still felt it was expensive. Once we were able to confirm our resort a few weeks later I decided to bite the bullet and was pleasantly surprised to find a $157 non-stop, round trip fare from ORD on United. We leave at 6:30am which is REALLY early (I'm not a morning person!) but $157 round trip is too good to pass up. Plus, we'll get to MCO at 10:15am and we can get a good part of the day in at the parks.
Good luck!! Hopefully you can get cheaper flights the closer your vacation approaches. I'm guessing with our economy as lousy as it is that airlines will need to offer cheap flights to keep people buying.