| Nonstop Flights: Austin to/from San Diego $147 r/t â Alaska Airlines Alaska Airlines has round-trip flights from Austin (AUS) to San Diego (SAN) for $147, NONSTOP. Flights February to March. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended Weekends available. Note: Carry-on bag is allowed for free on Alaska Airlines. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate. We donât charge a subscription fee. All of our deal notifications are available for FREE via Instagram, Facebook, Twitter, our Webpage, and our E-mail list. If you are paying someone a subscription fee for our content, you are being ripped off. Read More Nonstop Flights: Austin to/from San Diego $147 r/t â Alaska Airlines . | 