American Airlines has round-trip flights from Austin (AUS) to Puerto Vallarta (PVR) for $258, NONSTOP. Flights June to August. Departures on Tuesday and Saturday. Most trips are 7-days or longer. There are also 2-day trips, but those were midweek, Tuesdays to Thursdays; too short for our tastes, but they may be what you’re wanting for a short trip.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Click for more details and booking links Nonstop Flights: Austin to Puerto Vallarta $258 r/t [June-August] – American Airlines