QR 2183 then UA 3918 at San Francisco
Los Angeles → San Francisco → Denver
Timetable, San Francisco time
23:27QR 2183 from Los Angeles at the gatealso BA 6449
21:45UA 3918 to Denver leaves the gate
22 h 18 apart on the timetable, overnight
UA 3918 leaves 22 h 18 after QR 2183 arrives on the timetable: more than half a day, so not a connection we count.