CK 225 then UA 329 at O'Hare
Seattle (SEA) → Chicago → Denver
Timetable, Chicago time
07:42CK 225 from Seattle (SEA) at the gate
19:57UA 329 to Denver leaves the gate
12 h 15 apart on the timetable
UA 329 leaves 12 h 15 after CK 225 arrives on the timetable: more than half a day, so not a connection we count.