Air Canada $424 round trip for San Jose SJC to Beijing is the lowest fare among several airlines offering tickets under $500 for travel March-May, Sep-Dec 2018. Ticket prices are under $500 round trip from LAX and SFO too.
Air Canada San Jose SJC – Vancouver YVR – Beijing PEK – YVR – SJC
$423.52 round trip Mon April 9 – Mon April 16
