Southwest is having a sale right now. Make sure to clear your cookies or use another browser.
Edited to add: Wow! I just checked and it appears the sale isn't going to help you. What I find interesting is that I can fly from SLC to SNA through PHX for $23 more. Something doesn't seem right.
What I have found with Southwest is to keep watching to establish what the usual rate is. Then you know what to expect and when the price goes down you can jump on it. Tuesday is usually a good day to check and surprisingly Sunday morning. I like Southwest because you can change to the lower fare and get a voucher with no change fees. To help with other airlines, I check the available seats as well. If the plane appears to be filling up, the price will not come down. With Southwest, if there gets to be several "unavailable" flights, then the price will not go down if you are close to your travel times. Sometimes with Southwest, they will lower one flight (usually early morning or late night) if the flight isn't filling up. It is a game that I've been playing for over 5 years now. I had a DD who went to school in MA and either I was back there or she was here every 6 weeks during the school year. That was 9 round trip airfares a school year and then we added Summer Camp on top of it. Good luck.