UA 543 then WN 1790 at San Francisco
Chicago O'Hare → San Francisco → Las Vegas
Timetable, San Francisco time
13:30UA 543 from Chicago O'Hare at the gatealso AC 4163, VA 8089, NZ 9321
12:50WN 1790 to Las Vegas leaves the gate
23 h 20 apart on the timetable, overnight
WN 1790 leaves 23 h 20 after UA 543 arrives on the timetable: more than half a day, so not a connection we count.