UA3871 XiamenXMN San FranciscoSFO · 14:07
UA3871 by United Airlines flies from Xiamen (XMN) to San Francisco (SFO) for the Thu, Sep 17 departure.
arrival expected at SFO · on schedule
board checked 30m ago · checking again in 45s
The route today
live boardsWhen it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
How UA3871 actually runs
Pro Flight Search has tracked every published board update for UA3871 across the XMN and SFO boards: schedule changes, gate pushes and actual clocks. Combined risk score: 50.0/100. Based on airport operations, weather, and cached board history at XMN and SFO.
The verdict above is that record speaking, so it reflects how UA3871 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as XMN and SFO published them.
Planning around UA3871? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA3871 Xiamen to San Francisco on-time performance, measured from the XMN and SFO airport boards.
https://proflightsearch.com/flight/UA3871
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