Schedule: a typical summer Wednesday (the flights of Jul 29, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

DELTA · FLIGHT DL 321 SCHEDULED · TYPICAL SCHEDULE

Wednesday, September 30

DL 321 · BOS → LAX

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

Forecast issued Wed 10:00 PM ET · 2h after departure

Arrive at LAX more than 15 minutes late?

41% chance · ±0 pts +5 pts · 24h

HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.

How late will it get to LAX?

On time or early
58%
15–30 min late
19%
30 min–1 hour late
13%
1–2 hours late
6%
Over 2 hours late
4%
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

↑ Arrivals into LAX at that hour are often late

↑ BOS is prone to delays

↓ Wednesdays in September are usually quieter than average

↓ Cloud base down to 1,000 ft forecast at LAX that day

Weather at each end

BOS (origin) Gusts8 kt Ceiling700 ft Visibility2 mi Precip0.02 in

LAX (destination) Gusts13 kt Ceiling1,000 ft Visibility7 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?