I've think I've mentioned this before, but I I've always had success with using Orbitz. They consistently have better prices and lately I have been using the Deal Detector. You just set it up to "watch" flights for you and if the price lowers, they send you an email. If you have some time before you fly, this might be a good tool for you to use. Of course there are many other travel sites you can use, I have always just preferred Orbitz.