Delta has started round two of discount airfares to Europe today. Two of the big discount routes from Los Angeles are to Spain. Los Angeles LAX to Barcelona is as low as $592 round trip and Madrid is $606.
Low fares from LAX are available from mid September into March 2016, mostly Monday, Tuesday and Wednesday, except around holiday weeks.
San Jose SJC also has Delta at $606 to Madrid. San Jose has far fewer dates with low fares and only in October and November with this sale.
You can also fly KLM or Air France directly between LAX and Amsterdam or Paris for about $640 round trip. That would be my preference.
Delta Airlines Los Angeles LAX – New York JFK – Barcelona BCN
$592.00 Tuesday Sep 15 – Tuesday Sep 22
Delta Airlines Los Angeles LAX – Atlanta ATL – Barcelona BCN
$606.00 Tuesday Oct 27 – Tuesday Nov 3