Y4 2770 then UA 1114 at San Francisco
Las Vegas → San Francisco → Chicago O'Hare
Timetable, San Francisco time
14:20Y4 2770 from Las Vegas at the gatealso F9 4401
14:00UA 1114 to Chicago O'Hare leaves the gatealso AC 5196, CA 7327, VA 8100, NZ 9302
23 h 40 apart on the timetable, overnight
UA 1114 leaves 23 h 40 after Y4 2770 arrives on the timetable: more than half a day, so not a connection we count.