UA 1972 then WN 3531 at Salt Lake City
Chicago O'Hare → Salt Lake City → San Diego
Timetable, Salt Lake City time
11:37UA 1972 from Chicago O'Hare at the gate
16:10WN 3531 to San Diego leaves the gate
4 h 33 apart on the timetable
The last days
UA 1972 and WN 3531 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.