OZ521 SeoulICN · 07:50 LondonLHR · 14:20
OZ521 by Asiana Airlines flies from Seoul (ICN) to London (LHR) for the Mon, Sep 14 departure.
estimated arrival at LHR · local time · ~10h 43m from now
board checked 27m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 09:15 · typical taxi-out at ICN ≈ 6.5 min. No receiver coverage over open ocean.
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 +12 min · 0 cancelled · 14 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Early read, sample still buildingConditions at ICN and LHR 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.
How OZ521 actually runs
Pro Flight Search has tracked every published board update for OZ521 across the ICN and LHR boards: schedule changes, gate pushes and actual clocks. Usually lands ~9 min late. Based on 13 confirmed landings · 8/13 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 OZ521 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 LHR published them.
Planning around OZ521? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — OZ521 Seoul to London on-time performance, measured from the ICN and LHR airport boards.
https://proflightsearch.com/flight/OZ521
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