United Airlines has a low fare at $417 round trip for nonstop flights from San Francisco SFO to Hong Kong. There are also one-stop itineraries via Tokyo using Star Alliance partner ANA flights for a few dollars more.
San Jose SJC prices at $447 round trip with ANA via Tokyo.
Departure dates: late August to early December 2018.
United Airlines San Francisco SFO – Hong Kong HKG – SFO nonstop flights