DL 3607 then WN 3519 at Salt Lake City
Boise → Salt Lake City → Denver
Timetable, Salt Lake City time
10:15DL 3607 from Boise at the gate
16:35WN 3519 to Denver leaves the gate
6 h 20 apart on the timetable
The last days
DL 3607 and WN 3519 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.