UA 3852 then UA 2091 at San Francisco
Ontario → San Francisco → Chicago O'Hare
Timetable, San Francisco time
10:55UA 3852 from Ontario at the gate
06:35UA 2091 to Chicago O'Hare leaves the gatealso AC 5366, VA 8097, NZ 9309
19 h 40 apart on the timetable, overnight
UA 2091 leaves 19 h 40 after UA 3852 arrives on the timetable: more than half a day, so not a connection we count.