| Cheap Flights: Austin to Barcelona $496 r/t â Delta Delta has round-trip flights from Austin (AUS) to Barcelona (BCN) for $496 with a connection. Flights January to February. No Friday departures. Extended Weekends available. Note: Previous deals were about -$50 cheaper than this. We think there is a good chance that this price will go lower than it is now. Note: Carry-on bag is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate. We donât charge a subscription fee. All of our deal notifications are available for FREE via Instagram, Facebook, Twitter, our Webpage, and our E-mail list. If you are paying someone a subscription fee for our content, you are being ripped off. Read More Cheap Flights: Austin to Barcelona $496 r/t â Delta . | 