Search a Day Plus or Minus
Unless your travel dates are absolutely set in stone, use flexible date searches for flights. Just about every airlines website offers the feature in which you can retrieve prices for a few days before and after your selected dates as do major sites like Travelocity and Kayak. It tends to be cheaper to fly on days other than Friday and Sunday, but dont assume anything. Flying just one day earlier or later than your ideal date could mean saving an easy $100.