Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 321SCHEDULED · TYPICAL SCHEDULE
Today
DL 321 · BOS → LAX
departs 8:30 PM ET · arrives 11:51 PM PT
Forecast issued Fri 10:00 AM ET · 10h before departure
Odds over time
Arrive at LAX more than 15 minutes late?
60%chance · ±0 pts+32 pts · 24h
HOW SURE WE AREGood. The odds now lean mostly on firmed-up weather forecasts.
How late will it get to LAX?
On time or early
37%
15–30 min late
16%
30 min–1 hour late
22%
1–2 hours late
10%
Over 2 hours late
8%
Cancelled
8%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.