Schedule: the flights that flew on Thursday, Nov 5, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

UNITED · FLIGHT UA 1668 SCHEDULED · TYPICAL SCHEDULE
Tomorrow

UA 1668 · SFO → SAN

departs 1:54 PM PT · arrives 3:38 PM PT
Forecast issued Wed 12:00 PM ET · 29h before departure

UA 1668 isn’t flying SFO → SAN on Thu, Nov 12

This listing came from a typical schedule. According to the FAA, UA 1668 flies these legs that day: