UO631 SeoulICN · 15:45 Hong KongHKG · 18:50
UO631 by HK Express flies from Seoul (ICN) to Hong Kong (HKG) for the Thu, Oct 29 departure.
departs ICN · on schedule
board checked 22m ago · checking again in 45s
⚖ UO631 typically leaves +10 and lands −15. 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 −15 min · 0 cancelled · 14 operations tracked
The route today
live boardsTomorrow at Hong Kong
ForecastFri 30 Oct, local date
- Chance a departure is cancelled
- 0.4%usually 0.6%
- Chance a departure leaves 60+ min late
- 4.2%usually 4.0%
Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · Based on about 440 departures a day. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Seoul to Hong Kong flights today
same route · HK ExpressIf UO631 is cancelled, this is the other HK Express nonstop flight from Seoul to Hong Kong on the same day, with scheduled departure times in ICN local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UO631 actually runs
Pro Flight Search has tracked every published board update for UO631 across the ICN and HKG boards: schedule changes, gate pushes and actual clocks. Usually lands ~15 min early. Based on 13 confirmed landings · 12/13 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 UO631 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 ICN and HKG published them.
Planning around UO631? 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 — UO631 Seoul to Hong Kong on-time performance, measured from the ICN and HKG airport boards.
https://proflightsearch.com/flight/UO631
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