WN 893 then UA 2853 at Denver
Oklahoma City → Denver → Washington
Timetable, Denver time
18:35WN 893 from Oklahoma City at the gate
12:35UA 2853 to Washington leaves the gate
18 h apart on the timetable, overnight
UA 2853 leaves 18 h after WN 893 arrives on the timetable: more than half a day, so not a connection we count.