Basic direct low-fare flight. Daily flights so a lot of dates to choose from in similar price range.
UPDATE1 - with the correct link.
Link to the £284.80 return flight to LA:LINK
Link to the £294.80 return flight to SF:LINK
UPDATE2 - OK, I cannot get the links in "Details" section to work. Please see comment #3 for the link to the SF flight. The main link is to an LA flight.