Oneworld Alliance launched their own low fares from San Francisco and San Jose to Madrid and several other cities across Spain. United Airlines had Barcelona and Madrid on sale earlier today.
SJC appears to have more low fare dates through May and part of June, as with the sale earlier on United.
Best prices to Barcelona still look to be United/Star Alliance.
British Airways AARP discount fares take up to $65 off these Oneworld alliance prices.
SFO – Vigo VGO $525 (Delta/Air Europa) – this is a real fare war. American is $555 to Vigo.
San Francisco-Madrid British Airways AARP ticket discount