UA852 TaipeiTPE · 14:30 San FranciscoSFO · 11:15
UA852 by United Airlines flies from Taipei (TPE) to San Francisco (SFO) for the Wed, Sep 23 departure.
estimated arrival at SFO · local time · ~3h 46m from now
board checked 58m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 14:20 · typical taxi-out at TPE ≈ 13 min. No receiver coverage over open ocean.
Where the minutes go
last 5 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 +17 min · 0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at TPE 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.
Other Taipei to San Francisco flights today
same route · United AirlinesIf UA852 is cancelled, this is the other United Airlines nonstop flight from Taipei to San Francisco on the same day, with scheduled departure times in TPE local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA852 actually runs
Pro Flight Search has tracked every published board update for UA852 across the TPE and SFO boards: schedule changes, gate pushes and actual clocks. Usually lands ~26 min late. Based on 4 confirmed landings · 0/4 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA852 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N785UA, N78013.
Board clocks recorded as TPE and SFO published them.
Planning around UA852? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — UA852 Taipei to San Francisco on-time performance, measured from the TPE and SFO airport boards.
https://proflightsearch.com/flight/UA852
.