CX421 TaipeiTPE · 16:30 Hong KongHKG · 18:30
CX421 by Cathay Pacific flies from Taipei (TPE) to Hong Kong (HKG) for the Mon, Sep 7 departure.
arrived at HKG · 18 min early
⚖ CX421 typically leaves +30 and lands +7. The air wins minutes back.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 +7 min · 0 cancelled · 14 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at TPE and HKG 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 Hong Kong flights today
same route · Cathay PacificIf CX421 is cancelled, these are the other Cathay Pacific nonstop flights from Taipei to Hong Kong 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 CX421 actually runs
Pro Flight Search has tracked every published board update for CX421 across the TPE and HKG boards: schedule changes, gate pushes and actual clocks. Usually lands ~7 min late. Based on 13 confirmed landings · 9/13 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how CX421 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-LBB, B-LAR, B-KPF, B-HYJ.
Board clocks recorded as TPE and HKG published them.
Planning around CX421? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — CX421 Taipei to Hong Kong on-time performance, measured from the TPE and HKG airport boards.
https://proflightsearch.com/flight/CX421
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