American Airlines has round-trip flights from Austin (AUS) to Albuquerque, Columbus, Indianapolis, Kansas City, Miami, Pittsburgh, Sacramento, San Jose, St. Louis, Baltimore, or Tampa (ABQ, CMH, IND, MCI, MIA, PIT, SMF, SJC, STL, BWI, TPA) for $158 with a connection. Flights January to March. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available.
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.