Air Canada, Lufthansa, British Airways, Iberia and various other airlines have round-trip flights from Austin (AUS) to Barcelona (BCN) for $517-$532 with a connection. Flights September to February. Departures on Monday, Tuesday, Wednesday, and Sunday. 7-day minimum stay required.
This fare is a small part of the larger European Airfare sale that started several days ago. There are many other destinations on sale.