WN 2952 then UA 1639 at Denver
Los Angeles → Denver → St Louis
Timetable, Denver time
22:10WN 2952 from Los Angeles at the gate
13:55UA 1639 to St Louis leaves the gate
15 h 45 apart on the timetable, overnight
UA 1639 leaves 15 h 45 after WN 2952 arrives on the timetable: more than half a day, so not a connection we count.