WN 893 then UA 596 at Denver
Oklahoma City → Denver → Des Moines
Timetable, Denver time
18:35WN 893 from Oklahoma City at the gate
09:45UA 596 to Des Moines leaves the gate
15 h 10 apart on the timetable, overnight
UA 596 leaves 15 h 10 after WN 893 arrives on the timetable: more than half a day, so not a connection we count.