Southwest is not always the cheapest

Well, all I can say is that airfare prices can be volatile, and go up & down like car rental prices.   We have SWA tickets to Vegas for September, that were $127 each way out of Midway ... and then again to Vegas in November for $148 each way.

But then again, I start checking prices on the first day that SWA opens up a new dateline, and follow that up by checking prices about 3 or 4 times every week after that.   The prices do change often, and sometimes you just need to get lucky.