my advice: watch the pricing and book at a rate ou feel is reasonable, then never look at it again. I go by what I paid the year prior as a gauge of what is reasonable. In my particular case, the flights I bought in the fall have about tripled since I bought them. It was about 5-6 months prior to my flight, which seems to be uncommon, but I paid only about $30 dollars more than last year so I felt comfortable with the pricing (plus, my airline started charging for first bag ).