UO631 SeoulICN · 15:25 Hong KongHKG · 18:15
UO631 by HK Express flies from Seoul (ICN) to Hong Kong (HKG) for the Mon, Sep 7 departure.
arrived at HKG · 15 min early
⚖ UO631 typically leaves +19 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 · 15 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Early read, sample still buildingConditions at ICN 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. This route's tracked sample is still thin — treat these as an early read, not a precise forecast.
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 Seoul to Hong Kong flights today
same route · HK ExpressIf UO631 is cancelled, these are the other HK Express nonstop flights 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 14 confirmed landings · 14/14 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
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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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