M0 601 then BX 9029 at Incheon
Ulaanbaatar → Seoul → Chiang Mai
Timetable, Seoul time
19:30M0 601 from Ulaanbaatar at the gate
19:00BX 9029 to Chiang Mai leaves the gate
23 h 30 apart on the timetable, overnight
BX 9029 leaves 23 h 30 after M0 601 arrives on the timetable: more than half a day, so not a connection we count.