Airlines with all three major alliances have Los Angeles LAX to Hong Kong HKG at ticket prices under $500 round trip for travel November to May 2018.
American Airlines $472.26 round trip
Los Angeles LAX – Hong Kong HKG – LAX nonstop
United Airlines $481.56 round trip
Los Angeles LAX – San Francisco SFO – Hong Kong HKG – San Francisco SFO– LAX