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 1399
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
DL 1399 · MIA → BOS
departs 11:30 AM ET · arrives 2:59 PM ET
Forecast issued Tue 11:00 PM ET · 36h before departure
Watch this flight
Other days
Today 25%
Thu 10/1
Fri 10/2 26%
Sat 10/3 17%
Sun 10/4 19%
Mon 10/5 22%
Tue 10/6 17%
Odds over time
Arrive at BOS more than 15 minutes late?
19%
chance · ±3 pts
−3 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
19%
Leave 15+ late
23%
Arrive 1h+ late
10%
Cancelled
2%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at BOS more than 15 minutes late?
Calm-weather odds: 10% · changed −3 pts in 24h
−3 pts
19%
Yes 19%
No 81%
Leave MIA more than 15 minutes late?
Calm-weather odds: 14% · changed +1 pt in 24h
+1 pt
23%
Yes 23%
No 77%
Arrive at BOS more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
10%
Yes 10%
No 90%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
How late will it get to BOS?
On time or early
80%
15–30 min late
0%
30 min–1 hour late
8%
1–2 hours late
7%
Over 2 hours late
3%
Cancelled
2%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Gusts to 27 kt, 0.6 in of rain, thunderstorms forecast at MIA that day
↑
Arrivals into BOS at that hour are often late
↑
This flight has been late 26% of the time recently
↓
Visibility down to 1 mi forecast at BOS that day
↓
Thursdays in October are usually quieter than average
Weather at each end
MIA (origin)
Gusts 27 kt Ceiling 2,600 ft Visibility 5 mi Precip 0.63 in
BOS (destination)
Gusts 16 kt Ceiling none (clear) Visibility 1 mi Precip none
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.