There really is no rhyme or reason to when what cities go on sale, but you should check out a farewatcher type thing like Orbitz's 'deal detector' -- you enter your departure and arrival airports and set a fare -- and when the fare for that trip dips that low it'll alert you. i tried this for a flight to the beach I was hoping to be able to afford and sure enough -- i found one!

Good luck, and oh...go titans!