| Cheap Flights: Austin to Barcelona $446-$466 r/t [January-March] â Delta / Virgin Atlantic / KLM Delta, Virgin Atlantic, and KLM have round-trip flights from Austin (AUS) to Barcelona (BCN) for $446-$466 with a connection. Flights January to March. Extended weekends available. Click for more details and booking links Cheap Flights: Austin to Barcelona $446-$466 r/t [January-March] â Delta / Virgin Atlantic / KLM . | 