UA 3851 then UA 1114 at San Francisco
Rio De Janeiro → San Francisco → Chicago O'Hare
Timetable, San Francisco time
17:41UA 3851 from Rio De Janeiro at the gate
14:00UA 1114 to Chicago O'Hare leaves the gatealso AC 5196, CA 7327, VA 8100, NZ 9302
20 h 19 apart on the timetable, overnight
UA 1114 leaves 20 h 19 after UA 3851 arrives on the timetable: more than half a day, so not a connection we count.