Judging by this year, I was looking and the date they started to come down was around the 16th, although did just find this
Best Practices in finding Lower Airfare
When planning your international travel, there are many guidelines to follow which will lead to the lowest fare possible. Airlines have studied passenger behavior and know when they can get away with charging the highest fare. Avoid these situations and pay less airfares, also look out for airline specials in combination with these tips.
Low Fare Tips
Plan and purchase your tickets at least 2-5 months in advance or as soon as you know your travel plans
Avoid flying on weekends
Travel during low season periods
Minimum and Maximum days traveled
Try to have a connecting flight verse a direct flight
Compare airfare prices by shopping the Internet
Plan and Purchase your tickets 2-5 months in advance
The best way to guarantee you will get the best airfare is by purchasing your tickets at least 21 days or more in advance. Airlines offer lower fares when you buy early and typically the airfare increases every day your travel date approaches. Lower fares sell out fast so buying 2-3 months in advance will ensure your discounted seat is available. An example would be if you would like to travel during the Christmas period - purchase your tickets in August or September.
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Avoid flying on weekends
Best days of the week to travel are Monday through Thursday. Traveling on the weekends (Fri, Sat, Sun) will typical cost you an additional $25-$40 for departure or return flight. An example would be if traveling and returning on a weekend this charge will be double.
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Travel during low season periods
Over the course of the year there are periods where airfares are lower when compared to shoulder or peak seasons for travel. If you must travel during peak seasons try to leave before the season period begins.
Low Season
This period begins the second week of January until April 1st and begins again in September until the first week of December
Shoulder Season
This period begins April until June 1st
Peak season
This period begins Jun 1st until August 31st and begins again in December until the first week of January