LJ6421 SeoulGMP · 14:35 Jeju CityCJU · 15:50
LJ6421 by Jin Air flies from Seoul (GMP) to Jeju City (CJU) for the Sun, Nov 8 departure.
departs GMP · on schedule
board checked 6m ago · checking again in 45s
⚖ LJ6421 typically leaves +30 and lands +17. 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 +17 min · 0 cancelled · 14 operations tracked
The route today
live boardsWhen it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Seoul to Jeju City flights today
same route · Jin AirIf LJ6421 is cancelled, these are the other Jin Air nonstop flights from Seoul to Jeju City on the same day, with scheduled departure times in GMP local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →
How LJ6421 actually runs
Pro Flight Search has tracked every published board update for LJ6421 across the GMP and CJU boards: schedule changes, gate pushes and actual clocks. Usually lands ~17 min late. Based on 13 confirmed landings · 4/13 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 LJ6421 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 GMP and CJU published them.
Planning around LJ6421? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search: LJ6421 Seoul to Jeju City on-time performance, measured from the GMP and CJU airport boards.
https://proflightsearch.com/flight/LJ6421
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