| Nonstop Flights: Austin to/from San Francisco $137-$147 r/t [November-February] (No Holidays) â United / Alaska Airlines United and Alaska Airlines have as round-trip flights from Austin (AUS) to San Francisco (SFO) for $137-$147, NONSTOP. Flights November to February. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. Carry-on is allowed for free on Alaska, but not United (unless youâre using their credit card perk or have frequent flyer status). Click for more details and booking links Nonstop Flights: Austin to/from San Francisco $137-$147 r/t [November-February] (No Holidays) â United / Alaska Airlines . | 