AS 236 then UA 3900 at San Francisco
Portland (Oregon) → San Francisco → Rio De Janeiro
Timetable, San Francisco time
16:44AS 236 from Portland (Oregon) at the gatealso QR 2136, QR 2154, BA 2953, QF 3788, AA 7532
16:00UA 3900 to Rio De Janeiro leaves the gate
23 h 16 apart on the timetable, overnight
UA 3900 leaves 23 h 16 after AS 236 arrives on the timetable: more than half a day, so not a connection we count.