WN 209 then UA 513 at Denver
St Louis → Denver → Bozeman
Timetable, Denver time
18:50WN 209 from St Louis at the gate
13:40UA 513 to Bozeman leaves the gate
18 h 50 apart on the timetable, overnight
UA 513 leaves 18 h 50 after WN 209 arrives on the timetable: more than half a day, so not a connection we count.