UA 3911 then AS 583 at O'Hare
Portland (Oregon) → Chicago → Seattle (SEA)
Timetable, Chicago time
17:09UA 3911 from Portland (Oregon) at the gate
09:30AS 583 to Seattle (SEA) leaves the gate
16 h 21 apart on the timetable, overnight
AS 583 leaves 16 h 21 after UA 3911 arrives on the timetable: more than half a day, so not a connection we count.