NH 7284 then LX 39 at San Francisco
Seattle → San Francisco → Zurich
Timetable, San Francisco time
23:00NH 7284 from Seattle at the gate
19:25LX 39 to Zurich leaves the gatealso UA 9725
20 h 25 apart on the timetable, overnight
LX 39 leaves 20 h 25 after NH 7284 arrives on the timetable: more than half a day, so not a connection we count.