DL 637 then DL 2949 at Seattle
Chicago O'Hare → Seattle → Las Vegas
Timetable, Seattle time
20:38DL 637 from Chicago O'Hare at the gate
20:07DL 2949 to Las Vegas leaves the gate
23 h 29 apart on the timetable, overnight
DL 2949 leaves 23 h 29 after DL 637 arrives on the timetable: more than half a day, so not a connection we count.