| Nonstop Flights: Austin to San Diego $138 r/t [January-March] â Alaska Airlines Alaska Airlines has round-trip flights from Austin (AUS) to San Diego (SAN) for $138, NONSTOP. Flights January to March. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Click for more details and booking links Nonstop Flights: Austin to San Diego $138 r/t [January-March] â Alaska Airlines . | 