WN 2175 then UA 785 at San Francisco
Dallas → San Francisco → Washington
Timetable, San Francisco time
10:05WN 2175 from Dallas at the gate
06:15UA 785 to Washington leaves the gatealso AZ 4408, NZ 9160
20 h 10 apart on the timetable, overnight
UA 785 leaves 20 h 10 after WN 2175 arrives on the timetable: more than half a day, so not a connection we count.