UO646 Hong KongHKG · 13:00 TokyoNRT · 18:25
UO646 by HK Express flies from Hong Kong (HKG) to Tokyo (NRT) for the Tue, Sep 8 departure.
departs HKG · on schedule
board checked 44m ago · checking again in 45s
⚖ UO646 typically leaves −7 and lands −18. 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 −18 min · 0 cancelled · 12 operations tracked
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by HKG (Hong Kong), currently flying VFR (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 Hong Kong to Tokyo flights today
same route · HK ExpressIf UO646 is cancelled, these are the other HK Express nonstop flights from Hong Kong to Tokyo 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 UO646 actually runs
Pro Flight Search has tracked every published board update for UO646 across the HKG and NRT boards: schedule changes, gate pushes and actual clocks. Usually lands ~17 min early. Based on 11 confirmed landings · 11/11 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 UO646 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-KKH, B-KKC, B-KKP, B-KKE.
Board clocks recorded as HKG and NRT published them.
Planning around UO646? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UO646 Hong Kong to Tokyo on-time performance, measured from the HKG and NRT airport boards.
https://proflightsearch.com/flight/UO646
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