UA 611 then UA 2278 at San Francisco
Portland (Oregon) → San Francisco → Chicago O'Hare
Timetable, San Francisco time
07:22UA 611 from Portland (Oregon) at the gatealso AC 3343, VA 8458, NZ 9351
22:45UA 2278 to Chicago O'Hare leaves the gatealso VA 8105
15 h 23 apart on the timetable
UA 2278 leaves 15 h 23 after UA 611 arrives on the timetable: more than half a day, so not a connection we count.