WN 802 then UA 5991 at Denver
Boston → Denver → Salt Lake City
Timetable, Denver time
12:35WN 802 from Boston at the gate
15:45UA 5991 to Salt Lake City leaves the gate
3 h 10 apart on the timetable
The last days
WN 802 and UA 5991 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.