DL 3913 then AS 592 at Seattle
Portland (Oregon) → Seattle → Ontario
Timetable, Seattle time
20:50DL 3913 from Portland (Oregon) at the gate
15:28AS 592 to Ontario leaves the gate
18 h 38 apart on the timetable, overnight
AS 592 leaves 18 h 38 after DL 3913 arrives on the timetable: more than half a day, so not a connection we count.