We're also flying in on Nov. 19 and flying back on Nov. 25th. I had started watching fares about 2 months ago and the best I was seeing was about $300 for a nonstop RT fare. And I usually check everyday.
Then a few weeks ago, I brought up Northwest's site and plugged in my dates and lo and behold....up popped $210 pp, rt, nonstop! I jumped on those and we booked for 12 family members! Since that time...the price has now climbed again up above the $300 mark.
My advice is to check every single day if you can. It'll pay off! As soon as the price hits what you feel is a good price....buy your tickets!
Good luck,
Deb