Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.

DELTA · FLIGHT DL 321 SCHEDULED · TYPICAL SCHEDULE

Thursday, October 1 Tomorrow

DL 321 · BOS → LAX

departs 8:30 PM ET · arrives 11:51 PM PT

Forecast issued Wed 3:00 PM ET · 30h before departure

Arrive at LAX more than 15 minutes late?

28% chance · ±3 pts +5 pts · 24h

HOW SURE WE ARE Moderate. The odds now blend history with early weather forecasts.

How late will it get to LAX?

On time or early
72%
15–30 min late
9%
30 min–1 hour late
11%
1–2 hours late
4%
Over 2 hours late
3%
Cancelled
<1%

Gate arrival compared with the scheduled arrival. The ranges add up to 100%.

What’s moving the odds

↑ 8pm departures from BOS are often late

↑ Later flights pick up delays from earlier in the day

↑ Arrivals into LAX at that hour are often late

↓ Cloud base down to 400 ft forecast at LAX that day

↓ Mostly benign weather forecast at BOS

Weather at each end

BOS (origin) Gusts16 kt Ceilingnone (clear) Visibility8 mi Precipnone

LAX (destination) Gusts14 kt Ceiling400 ft Visibility3 mi Precipnone

How this resolves

Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.

Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.

DL 321 · BOS → LAX

Odds over time

How late will it get to LAX?