Alaska Airlines has round-trip flights from Austin (AUS) to San Francisco (SFO) for $157, NONSTOP. $79 each-way. Flights Tuesdays, Wednesdays, Saturdays, March to May. Origin/Destination reversible. Holiday Blackouts apply.
Note: American has flights with stops for about $144.
Note: Carry-on bag is allowed for free, but seat selection has a fee. Upgrades into “Regular Economy” are available for +$30 each-way.