Can you tell us which other fares with similar amounts are available?
Well, there are only 5 international (Trans-pacific) gateways on the west coast of the 2 big North American countries, so not much imagination is needed.
Gateway furthest south is lowest, actually can be had just a bit lower than the SQ fare... but its not *A... good for OW. Another good one to the same place will be OW in the future.
Also a ST fare that is about equal to the SQ fare to the same northern city.