3S 446 then UA 4419 at O'Hare
Frankfurt am Main → Chicago → St Louis
Timetable, Chicago time
23:493S 446 from Frankfurt am Main at the gate
12:55UA 4419 to St Louis leaves the gate
13 h 06 apart on the timetable, overnight
UA 4419 leaves 13 h 06 after 3S 446 arrives on the timetable: more than half a day, so not a connection we count.