Schedule: a typical Friday (the flights of Jul 31, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.

DELTA · FLIGHT DL 1399 SCHEDULED · TYPICAL SCHEDULE

Friday, October 2

DL 1399 · BOS → MIA

departs 7:05 AM ET · arrives 10:35 AM ET

Forecast issued Wed 12:00 AM ET · 55h before departure

Arrive at MIA more than 15 minutes late?

12% chance · ±0 pts −4 pts · 24h

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

How late will it get to MIA?

On time or early
87%
15–30 min late
4%
30 min–1 hour late
4%
1–2 hours late
2%
Over 2 hours late
2%
Cancelled
1%

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

What’s moving the odds

↑ Mostly benign weather forecast at MIA

↑ This flight has been late 15% of the time recently

↑ MIA is prone to delays

↓ Early flights usually leave on time

↓ Mostly benign weather forecast at BOS

Weather at each end

BOS (origin) Gusts19 kt Ceiling9,000 ft Visibility10+ mi Precipnone

MIA (destination) Gusts24 kt Ceiling7,000 ft Visibility7.33333 mi Precip0.15 in

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 1399 · BOS → MIA

Odds over time

How late will it get to MIA?