WN 347 then UA 1521 at Denver
Birmingham (Alabama) → Denver → San Antonio
Timetable, Denver time
18:45WN 347 from Birmingham (Alabama) at the gate
09:35UA 1521 to San Antonio leaves the gate
14 h 50 apart on the timetable, overnight
UA 1521 leaves 14 h 50 after WN 347 arrives on the timetable: more than half a day, so not a connection we count.