ZE 892 then UA 3900 at Incheon
Xiamen → Seoul → San Francisco
Timetable, Seoul time
17:10ZE 892 from Xiamen at the gate
19:30UA 3900 to San Francisco leaves the gate
2 h 20 apart on the timetable
The last days
ZE 892 and UA 3900 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.