F9 45 then UA 5191 at O'Hare
Cancún → Chicago → Lancaster
Timetable, Chicago time
14:45F9 45 from Cancún at the gate
08:50UA 5191 to Lancaster leaves the gate
18 h 05 apart on the timetable, overnight
UA 5191 leaves 18 h 05 after F9 45 arrives on the timetable: more than half a day, so not a connection we count.