Southwest has round-trip flights from Austin (AUS) to Kansas City, Jacksonville, Indianapolis, Atlanta, Minneapolis, Raleigh, or St. Louis (MCI, JAX, IND, ATL, MSP, RDU, STL) for $157-$188, NONSTOP. Flights September to February. Origin/Destination reversible.
Jacksonville is the most expensive fare in this list: $177-$188
All other fares are in the $157-$164 range.