I posted in another thread yesterday about an article in the Wall Street Journal this week about when to buy airline tickets (not specific to Orlando). They looked at a few studies and interviewed travel sites etc. The numbers show that the lowest prices were 57 days prior to departure, although one site, Hopper, said 80 days. They said airlines do not begin to actively manage a specific flight's fares until about three months before departure. They also looked at what days were best to book. Generally the weekends are better since there is no business travel booking, also Tuesdays are good, the worst day is Friday because of business booking. The general advice is to keep checking because they constantly adjust the prices. Orlando obviously is a special case because of school vacations and holidays affecting demand. Hope that helps.