Southwest has not issued any discount codes in a few years. I can only remember them issuing codes 2 or 3 times total in the past 5 years. The price you see online is the price you get, it will fluctuate up and down depending on demand, what day of the week you're looking, etc. If you have time your best bet to save money is to open a few Southwest credit cards with Chase: i.e. you and your spouse (
if you have one) could each open the PLUS and PREMIERE card, spend $2,000 in the first 3 months and you earn 52,000 points per card which is worth roughly $800 in airfare based on how I value Southwest Points. If you opened 4 cards and did this you'd earn over $3,000 in free airfare and would be close to earning 2 companion passes which would get you 2 free tickets for companions anytime you both fly. See this post on million mile secrets for more details:
http://millionmilesecrets.com/2014/02/20/a-step-by-step-guide-to-the-southwest-companion-pass/ Keep in mind that to do this with that many cards you would also have to spend $8,000 total on the credit cards within 3 months of opening then.
I know it sounds crazy but I've earned the CP this way...twice now! If you need a link to get the 50,000 bonus points respond back and I'll get you one.