My advice would be to have a thought in mind of what you would like to pay. If you see something close, book it. I have had both situations...got some very good deals when they open, but also saw prices I wasn't comfortable with. I waited a few months and got a much better price. It really depends on when you are traveling (season and day of the week). At BWI, we now have the option of Jet Blue. So, if pricing is high on Tuesday we can wait until early July and check Jet blue. We lost the competition when we lost Air Tran. And, yes they will change prices as the day goes on, but they often come back within a few days or weeks. Good luck. If it looks good for your family, grab it!