UA 471 then LN 744 at Dulles
San Antonio → Washington → Buffalo
Timetable, Washington time
11:13UA 471 from San Antonio at the gate
04:00LN 744 to Buffalo leaves the gate
16 h 47 apart on the timetable, overnight
LN 744 leaves 16 h 47 after UA 471 arrives on the timetable: more than half a day, so not a connection we count.