| Nonstop Flights: Austin to/from San Francisco $93 r/t [January-March] (Tue/Wed/Sat) â United / Alaska Airlines United has round-trip flights from Austin (AUS) to San Francisco (SFO) for $93, NONSTOP. Flights January to March. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. If youâre flying with two people, you can plug in most of these dates into Alaska Airlines and take advantage of the Buy-One-Get-One sale that is going on now. Use Coupon Code âSTARBUCKSâ at checkout. The Alaska Airlines fare allows for a free carry-on bag, which makes it a better deal. Click for more details and booking links Nonstop Flights: Austin to/from San Francisco $93 r/t [January-March] (Tue/Wed/Sat) â United / Alaska Airlines . | 