FI 853 then UA 3376 at O'Hare
Reykjavík → Chicago → St Louis
Timetable, Chicago time
17:20FI 853 from Reykjavík at the gate
11:00UA 3376 to St Louis leaves the gate
17 h 40 apart on the timetable, overnight
UA 3376 leaves 17 h 40 after FI 853 arrives on the timetable: more than half a day, so not a connection we count.