DL 541 then UA 367 at Dulles
Seattle (SEA) → Washington → San Francisco
Timetable, Washington time
22:49DL 541 from Seattle (SEA) at the gate
22:20UA 367 to San Francisco leaves the gate
23 h 31 apart on the timetable, overnight
UA 367 leaves 23 h 31 after DL 541 arrives on the timetable: more than half a day, so not a connection we count.