DL 2455 then WN 1737 at Salt Lake City
St Louis → Salt Lake City → Denver
Timetable, Salt Lake City time
16:40DL 2455 from St Louis at the gate
16:15WN 1737 to Denver leaves the gate
23 h 35 apart on the timetable, overnight
WN 1737 leaves 23 h 35 after DL 2455 arrives on the timetable: more than half a day, so not a connection we count.