CM 2457 then UA 1278 at San Francisco
Sacramento → San Francisco → Chicago O'Hare
Timetable, San Francisco time
21:41CM 2457 from Sacramento at the gatealso AC 4533, UA 5961, VA 8183
16:10UA 1278 to Chicago O'Hare leaves the gatealso AC 4674, NZ 9312
18 h 29 apart on the timetable, overnight
UA 1278 leaves 18 h 29 after CM 2457 arrives on the timetable: more than half a day, so not a connection we count.