UA 2330 then UA 2639 at San Francisco
Dallas-Fort Worth → San Francisco → Arcata
Timetable, San Francisco time
21:50UA 2330 from Dallas-Fort Worth at the gatealso AC 3970, OZ 6314, VA 8276, NZ 9093
16:20UA 2639 to Arcata leaves the gatealso EK 6490
18 h 30 apart on the timetable, overnight
UA 2639 leaves 18 h 30 after UA 2330 arrives on the timetable: more than half a day, so not a connection we count.