Schedule: the flights that flew on Friday, Oct 23, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

DELTA · FLIGHT DL 821 SCHEDULED · TYPICAL SCHEDULE

Friday, October 30 Tomorrow

DL 821 · ATL → BOS

departs 5:48 PM ET · arrives 8:19 PM ET

Forecast issued Thu 2:00 PM ET · 28h before departure

Arrive at BOS more than 15 minutes late?

25% chance · ±1 pts +0 pts · 24h

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

How late will it get to BOS?

On time or early
74%
15–30 min late
10%
30 min–1 hour late
9%
1–2 hours late
5%
Over 2 hours late
<1%
Cancelled
<1%

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

What’s moving the odds

↑ Arrivals into BOS at that hour are often late

↑ Later flights pick up delays from earlier in the day

↑ 5pm departures from ATL are often late

↓ Mostly benign weather forecast at ATL

↓ Mostly benign weather forecast at BOS

Weather at each end

ATL (origin) Gusts10 kt Ceilingnone (clear) Visibility10+ mi Precipnone

BOS (destination) Gusts21 kt Ceiling10,000 ft Visibility10+ 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 821 · ATL → BOS

Odds over time

How late will it get to BOS?