UA 12 then 1I 487 at O'Hare
Zurich → Chicago → Washington
Timetable, Chicago time
12:40UA 12 from Zurich at the gate
15:301I 487 to Washington leaves the gate
2 h 50 apart on the timetable
Today
From the airport’s board at 15:07 Chicago time
12:07UA 12 reached the gate33 min early
15:301I 487 due to leave, no estimate yet
3 h 23 between the gates, on these times
The last days
UA 12 and 1I 487 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.