Schedule: the flights that flew on Wednesday, Oct 21, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
Today
UA 580 · ORD → BUF
departs 2:01 PM CT · arrives 4:46 PM ET
UA 580 isn’t flying ORD → BUF today
This listing came from a typical schedule. According to the FAA, UA 580 flies these legs today: