UA858 ShanghaiPVG · 12:10 San FranciscoSFO · 08:55
UA858 by United Airlines flies from Shanghai (PVG) to San Francisco (SFO) for the Wed, Aug 19 departure.
arrived at SFO · 18 min late
Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival +18 min · 0 cancelled · 7 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at PVG and SFO are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
How UA858 actually runs
Pro Flight Search has tracked every published board update for UA858 across the PVG and SFO boards: schedule changes, gate pushes and actual clocks. Usually lands ~18 min late. Based on 7 confirmed landings · 2/7 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how UA858 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 PVG and SFO published them.
Planning around UA858? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA858 Shanghai to San Francisco on-time performance, measured from the PVG and SFO airport boards.
https://proflightsearch.com/flight/UA858
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