AF 2209 then UA 1145 at San Francisco
Seattle → San Francisco → Cancún
Timetable, San Francisco time
23:56AF 2209 from Seattle at the gatealso AM 4541
23:00UA 1145 to Cancún leaves the gate
23 h 04 apart on the timetable, overnight
UA 1145 leaves 23 h 04 after AF 2209 arrives on the timetable: more than half a day, so not a connection we count.