DL 810 then UA 4500 at Detroit
Seattle → Detroit → Washington
Timetable, Detroit time
06:28DL 810 from Seattle at the gate
19:45UA 4500 to Washington leaves the gate
13 h 17 apart on the timetable
UA 4500 leaves 13 h 17 after DL 810 arrives on the timetable: more than half a day, so not a connection we count.