Two airlines offering nonstop flights from Oakland to Barcelona means some great competitive fare deals for spring 2018 travel at $312 round trip with Level Airlines (Iberia) or $328 round trip with Norwegian Airlines or mix and match.
These low fares on Level Airlines are available April to early June, then September-October 2018.
My preference is Norwegian Airlines for its comfortable 787 Dreamliner amenities and inflight entertainment system for the long haul flight. But these low fare deals are available on more dates with Level Airlines flights.
Level Airlines Oakland OAK – Barcelona BCN
Level Airlines Barcelona BCN – Oakland OAK
Level Airlines $312.49 round trip OAK-BCN-OAK.