Air BusanBX50% on time
live
Direct flights from Jeju City (CJU) to Ulsan (USN): 14 nonstop departures observed each week across 2 airlines. 46% of the last 24 operated flights arrived within 15 minutes of schedule. The median arrival is 17 minutes late. No cancellations were recorded across the 24 tracked flights. The nonstop covers 349 km, an estimated 57 minutes in the air. Measured by Pro Flight Search from live flight boards at Jeju City and Ulsan. Updated 13 September 2026 at 18:24 UTC.
CJU
Jeju City
smooth · +8
USN
Ulsan
tracking
349 km · ~0h 57m est.
Runs rough · 2 airlines · 14x weekly · nonstop
46% on time
of the last 24 operated CJU → USN flights arrived within 15 minutes
Median arrival delay is +17 min. 0 of 24 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+17 minacross the last 24 operated legs
Flight time~0h 57mestimated from route distance
Weekly departures14x2 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 24
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Air Busan대한항공
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 days대한항공KE38% on time
Flights KE1596 13:10 daily
History
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsnext sweep in 120s
How the Jeju City to Ulsan route actually runs
Pro Flight Search records official board updates for nonstop CJU to USN flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Jeju City (CJU) to Ulsan (USN) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/CJU-USN
CJU to USN questions
Is CJU–USN running on time right now?
Smooth skies ahead. The departure side at CJU is the weaker end, route health score 88/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on CJU–USN?
Operators schedule morning departures around 09:20 from CJU. Earlier flights typically land before destination-airport delays accumulate later in the day; check the USN delay card to confirm conditions when you'd arrive.
How long is the flight from CJU to USN?
Great-circle distance is 349 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 55–60 min gate-to-gate on this route.
How often does CJU–USN fly?
2 carriers operate this route, around 21 flights a week between them. Compare carrier days and times in the airline list above.
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