I check SWA flight prices every single day and they randomly drop. Their sales usually run Tue-Thu but I will see a drop on other days too. Wish I knew the pattern but I just double check all my booked flights every day to be safe. Have saved a ton of points by doing this.FYI for Southwest points users, they're having a big sale right now, so check your flights to see if they've dropped in points! I just got about 20,000 points back in my RR account for my summer flights.