TK 6037 then UA 4166 at O'Hare
Istanbul → Chicago → Madison
Timetable, Chicago time
06:05TK 6037 from Istanbul at the gate
10:42UA 4166 to Madison leaves the gate
4 h 37 apart on the timetable
The last days
TK 6037 and UA 4166 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.