I know it's not November, but when I booked 3 tickets CNX-BKK a few weeks ago, over a period of 4 days, the cheapest two fares bookable had disappeared, and only the flex fares remained (which were still fairly cheap anyway).

I flew back from CNX yesterday afternoon, I'd called in the morning and all flights were full for that day, so couldn't re-book. And indeed, not a single spare seat.

So if you think prices are good now, book to avoid disappointment. Air Asia aren't bad if you don't carry much luggage.