Cheap Flights: Austin to Barcelona $539-$569 r/t [June-September] â United United has round-trip flights from Austin (AUS) to Barcelona (BCN) for $539-$569 with a connection. Flights June to September. COVID restrictions are still in place, but this may be worthwhile for the dates later this year. Click for more details and booking links Cheap Flights: Austin to Barcelona $539-$569 r/t [June-September] â United . |