ZE 628 then RS 379 at Incheon
Sapporo → Seoul → Osaka
Timetable, Seoul time
16:00ZE 628 from Sapporo at the gate
18:50RS 379 to Osaka leaves the gate
2 h 50 apart on the timetable
The last days
ZE 628 and RS 379 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.