| Cheap Flights: Austin to/from Nashville $135 r/t [August-December] â United United has round-trip flights from Austin (AUS) to Nashville (BNA) for $135 with a connection. Flights August to December. Very few weekends available. Origin/Destination reversible. Click for more details and booking links Cheap Flights: Austin to/from Nashville $135 r/t [August-December] â United . | 