Star Alliance airline Air China has a low fare from San Francisco SFO to Hong Kong at $511 round trip. This fare is $531 round trip for September departures, then drops to $511 on October 14.
Most dates in November are $511. From mid-January to mid-March the fare is $511 most dates, then rises to upper $500s for April and into the $700s for May departures. $511 is the lowest fare I have seen for this route this year. Asiana Airlines has a $531 fare via Korea still around.
Air China San Francisco SFO – Beijing PEK – Hong Kong HKG
$510.70 Tuesday, November 10 – Tuesday, November 17
Flight Miles: 14,970 miles.
Ticket price on Air China site was $503.62 all-in for economy U class. Air China U fare class earns 50% flight miles with United Mileage Plus for 7,485 redeemable miles.