We go to the VNEA or BCA every year. The tourney is in May. I usually start check prices the first of Feb, and just keep checking every 3 or 4 days til I get a good deal. Right now, they are arond $300, but I think they will go down about $30 to $50 sometime in the next month. It's a bit of a gamble.
One important thing to remember when booking flights. Does the airline have a PER BAG fee for luggage. Don't think you have found a great price, and get stuck for bag fee of $25 per bag at the airport. Southwest and Jetblue currently allow the first 2 bags free, plus a carryon. I figure that into my pricing, and they're always cheaper. Don't forget, if you're taking a cue with you, YOU CAN NOT CARRY IT ON. I have a large soft case, made for golf clubs to put clothes and my pool case in. I have had friends put their pool case on the belt as checked luggage and they came up missing.
Hope this helps you out some.