F9 689 then F9 2349 at Denver
Washington National → Denver → Las Vegas
Timetable, Denver time
20:10F9 689 from Washington National at the gate
09:28F9 2349 to Las Vegas leaves the gate
13 h 18 apart on the timetable, overnight
F9 2349 leaves 13 h 18 after F9 689 arrives on the timetable: more than half a day, so not a connection we count.