CX139 Hong KongHKG · 09:10 SydneySYD · 20:10
CX139 by Cathay Pacific flies from Hong Kong (HKG) to Sydney (SYD) for the Wed, Sep 9 departure.
departs HKG · on schedule
board checked 3m ago · checking again in 45s
Where the minutes go
last 4 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
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at HKG and SYD 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 Hong Kong to Sydney flights today
same route · Cathay PacificIf CX139 is cancelled, these are the other Cathay Pacific nonstop flights from Hong Kong to Sydney on the same day, with scheduled departure times in HKG local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How CX139 actually runs
Pro Flight Search has tracked every published board update for CX139 across the HKG and SYD boards: schedule changes, gate pushes and actual clocks. Usually lands ~8 min late. Based on 4 confirmed landings · 3/4 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how CX139 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 HKG and SYD published them.
Planning around CX139? 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 — CX139 Hong Kong to Sydney on-time performance, measured from the HKG and SYD airport boards.
https://proflightsearch.com/flight/CX139
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