TR 671 then SQ 217 at Changi
Chiang Rai → Singapore → Melbourne
Timetable, Singapore time
19:40TR 671 from Chiang Rai at the gate
11:00SQ 217 to Melbourne leaves the gate
15 h 20 apart on the timetable, overnight
SQ 217 leaves 15 h 20 after TR 671 arrives on the timetable: more than half a day, so not a connection we count.