Clear your cookies before you re-check fares too.
That used to help, then they got more devious. Now they have programs that identify you with a high degree of accuracy by the browser, extensions, isp, etc. you use. Best bet is to shop on a site like Sidestep.com, which offers options to check several other searching sites, protecting your identity while you shop, then link you to the airlines site with the itinerary and price already established..
You want to originate in Houston, not Austin, right? If you have dates selected, fare alerts are great; even if not, there are not that many choices to set up alerts for all possible pairs. Sidestep will send an email every morning with the list.
Checking week by week in Sept, with Saturday flights
+ 3 days gives a look at the hole month in 4 tabs. Looks like the cheapest is Continental Fri Sep 3 to Sat Sep 11 for $608 inclusive. Curacao seems to be $100 more for that weekend on American. Wow! If you insisted on going to CUR on any day other that Saturdays, it'd be $7-8,000 on KLM! :shocked2: Surely that is a glitch.
Check originating Austin too, as sometimes it's cheaper to fly from a connection city than from the hub; sometimes it's not. Cont offers $750 for Fri Sep 3 to Sat Sep 11 from Austin or San Antonio.
Expanding the search to look at nearby cities on both ends, here is $491 on American on Sat Sep 4 to Sat Sep 11, AUS CUR - much cheaper than out of IAH. Is it easy to get from CUR to BON?
Good shopping...!!! 
