According to Expedia, the cheapest time to buy airline tickets is between October 9th and November 13th for traveling during the holidays. AAA says November 11-17. Johnny says that everyone should price out and use flight notifications and alerts by Google, or Kayak and Yapta. They will send you fare alerts when the price drops. They will also let you know if you can get a refund by changing your tickets.
Travel Tip of the month - Don't buy your Thanksgiving travel tickets too early. According to HipMonk, October 1st is the best day to buy your tickets to travel for the holidays. Get flight alerts from FareCompare.com, SkipLagged.com and Google Flights. Johnny says you won't get the best fares on the Wednesday before or the Sunday after the holiday, so it's better not to wait to book those.
Johnny says if you're planning to travel over Thanksgiving, the key is flexibility. Try a day or two before and after Thanksgiving, or if you have to fly on Thanksgiving day, fly in the afternoon. You'll get better deals than in the morning. When you search, don't put in the time of day. You'll get far more choices and better prices that way. Fly from alternate airports, which could be cheaper to fly into. Check out Google Flights first. Then go to the airline directly. Johnny Jet also has his own search tool.