I'm lucky to live in the region with several budget airlines connecting my home airport with the main hubs. I honestly can and usually do wait until the absolute last minute to book anyway, so hopefully if anything changes I'll be informed. And even if I have to lose any money, it won't be a heartbreak.
We do the same thing when in SEA. After landing and getting oriented, we head to the ticket counters and see what's cheap. That and not booking hotels before-hand has been the best way to travel for us.