UA 1352 then WN 1749 at Denver
St Louis → Denver → Dallas
Timetable, Denver time
10:21UA 1352 from St Louis at the gate
05:35WN 1749 to Dallas leaves the gate
19 h 14 apart on the timetable, overnight
WN 1749 leaves 19 h 14 after UA 1352 arrives on the timetable: more than half a day, so not a connection we count.