WN 209 then AS 493 at Denver
St Louis → Denver → Seattle
Timetable, Denver time
18:50WN 209 from St Louis at the gate
15:25AS 493 to Seattle leaves the gate
20 h 35 apart on the timetable, overnight
AS 493 leaves 20 h 35 after WN 209 arrives on the timetable: more than half a day, so not a connection we count.