VZ 205 then TG 409 at Bangkok
Udon Thani → Bangkok → Singapore
Timetable, Bangkok time
16:40VZ 205 from Udon Thani at the gate
16:35TG 409 to Singapore leaves the gate
23 h 55 apart on the timetable, overnight
TG 409 leaves 23 h 55 after VZ 205 arrives on the timetable: more than half a day, so not a connection we count.