DL 812 then DL 1371 at Detroit
Seattle → Detroit → St Louis
Timetable, Detroit time
13:19DL 812 from Seattle at the gate
12:40DL 1371 to St Louis leaves the gate
23 h 21 apart on the timetable, overnight
DL 1371 leaves 23 h 21 after DL 812 arrives on the timetable: more than half a day, so not a connection we count.