WN 3525 then BA 218 at Denver
Chicago Midway → Denver → London
Timetable, Denver time
20:20WN 3525 from Chicago Midway at the gate
17:01BA 218 to London leaves the gate
20 h 41 apart on the timetable, overnight
BA 218 leaves 20 h 41 after WN 3525 arrives on the timetable: more than half a day, so not a connection we count.