I'm somewhat stumped, but unless you can actually buy a ticket at the lower price, I am not sure I would trust the Google/ITA quote. ITA will price the lower fare with BJS as a sales city, and the higher with SFO. Both show a fare code of
GLE0ZEC7.
But the only valid fare info I can find is
GLE0ZEC7 (BJS to LAX, origin restricted to BJS):
Code:
V FARE BASIS BK FARE TRAVEL-TICKET AP MINMAX RTG
1 GLE0ZEC7 G‡R 270.00 T30JN -/‡ -/ 3M PA01
PASSENGER TYPE-ADT AUTO PRICE-YES
FROM-BJS TO-LAX CXR-UA TVL-21NOV16 RULE-PE2S IPRP/3
FARE BASIS-GLE0ZEC7 SPECIAL FARE DIS-E VENDOR-ATP
FARE TYPE-XPN RT-INSTANT PURCHASE NONREFUNDABLE-TYPE FARES
CNY 1780 0501 E31MAY16 D-INFINITY FC-GLE0ZEC7 FN-6U
SYSTEM DATES - CREATED 30MAY16/0832 EXPIRES INFINITY
The base fare is CNY 1780.00; and the YQ for BJS/LAX is CNY 2050.00 round trip. This total price matches with United.com China site, as well as ITA with a sales city of SFO (after an discrepancy in AY and possibly other fees). I'm skeptical the lower price is bookable, but I really don't know where ITA is getting its numbers.