| Nonstop Flights: Austin to/from San Francisco $137 r/t [October-February] â United United has round-trip flights from Austin (AUS) to San Francisco (SFO) for $137, NONSTOP. Flights October to February. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. United charges a fee for carry-on bags. Click for more details and booking links Nonstop Flights: Austin to/from San Francisco $137 r/t [October-February] â United . | 
