UA 5322 then DL 3876 at Denver
Durango → Denver → Austin
Timetable, Denver time
12:13UA 5322 from Durango at the gate
09:42DL 3876 to Austin leaves the gate
21 h 29 apart on the timetable, overnight
DL 3876 leaves 21 h 29 after UA 5322 arrives on the timetable: more than half a day, so not a connection we count.