Sale fares must be purchased before Dec. 2 and they start as low as $59 for travel Dec. 8-Feb. 15. Note that there are blackout dates -- Dec. 22-Jan. 3 and all Sundays -- and a 10-day advance purchase is required. Here is the fine print for Southwest and for its AirTran unit. It may pay to shop around as I expect competitors will start matching fares and you might be able to get better flight days/times.
