CK 225 then UA 5201 at O'Hare
Seattle (SEA) → Chicago → Milwaukee
Timetable, Chicago time
07:18CK 225 from Seattle (SEA) at the gate
20:00UA 5201 to Milwaukee leaves the gate
12 h 42 apart on the timetable
UA 5201 leaves 12 h 42 after CK 225 arrives on the timetable: more than half a day, so not a connection we count.