Fly from Dallas to San Diego for $180 round-trip, including all taxes, on United.
We found seats departing DFW on September 3, and returning from SAN on September 10. This fare is valid for travel is valid on Tuesdays, Wednesdays, and Saturdays, with a wide 330-day travel period. For booking info, see our Fare Details.
You'll find this route for even less ($158) if you're willing to fly on Spirit (which, judging by our inbox, isn't the most popular airline), available for travel from August through December.