UA 2813 then CX 3171 at Houston
Chicago → Houston → Anchorage
Timetable, Houston time
22:53UA 2813 from Chicago at the gate
17:58CX 3171 to Anchorage leaves the gate
19 h 05 apart on the timetable, overnight
CX 3171 leaves 19 h 05 after UA 2813 arrives on the timetable: more than half a day, so not a connection we count.