CK 227 then UA 3395 at O'Hare
Seattle (SEA) → Chicago → St Louis
Timetable, Chicago time
13:44CK 227 from Seattle (SEA) at the gate
13:00UA 3395 to St Louis leaves the gate
23 h 16 apart on the timetable, overnight
UA 3395 leaves 23 h 16 after CK 227 arrives on the timetable: more than half a day, so not a connection we count.