CI4 TaipeiTPE · 23:30 San FranciscoSFO · 19:55
CI4 by China Airlines flies from Taipei (TPE) to San Francisco (SFO) for the Mon, Sep 21 departure.
departs TPE · on schedule
board checked 54m ago · checking again in 45s
Where the minutes go
last 3 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by SFO (San Francisco), currently flying MVFR (marginal visual). 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 · China AirlinesIf CI4 is cancelled, these are the other China Airlines nonstop flights 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 CI4 actually runs
Pro Flight Search has tracked every published board update for CI4 across the TPE and SFO boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 3 completed legs so far: landed +22 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how CI4 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: B-18918, B-18905.
Board clocks recorded as TPE and SFO published them.
Planning around CI4? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — CI4 Taipei to San Francisco on-time performance, measured from the TPE and SFO airport boards.
https://proflightsearch.com/flight/CI4
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