WN 2115 then DL 2455 at Salt Lake City
Denver → Salt Lake City → St Louis
Timetable, Salt Lake City time
10:30WN 2115 from Denver at the gate
09:38DL 2455 to St Louis leaves the gate
23 h 08 apart on the timetable, overnight
DL 2455 leaves 23 h 08 after WN 2115 arrives on the timetable: more than half a day, so not a connection we count.