Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 1631
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
DL 1631 · ATL → MIA
departs 5:09 PM ET · arrives 7:25 PM ET
Forecast issued Fri 1:00 PM ET · 4h before departure
Watch this flight
Other days
Today
Sat 10/3 28%
Sun 10/4 37%
Mon 10/5 21%
Wed 10/7 21%
Odds over time
Arrive at MIA more than 15 minutes late?
45%
chance · ±0 pts
+15 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
45%
Leave 15+ late
51%
Arrive 1h+ late
27%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
3.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at MIA more than 15 minutes late?
Calm-weather odds: 25% · changed +15 pts in 24h
+15 pts
45%
Yes 45%
No 55%
Leave ATL more than 15 minutes late?
Calm-weather odds: 31% · changed +21 pts in 24h
+21 pts
51%
Yes 51%
No 49%
Arrive at MIA more than an hour late?
Calm-weather odds: 7% · changed +14 pts in 24h
+14 pts
27%
Yes 27%
No 73%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to MIA?
On time or early
54%
15–30 min late
29%
30 min–1 hour late
0%
1–2 hours late
13%
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
↑
5pm departures from ATL are often late
↑
This flight has been late 35% of the time recently
↑
Arrivals into MIA at that hour are often late
↓
ATL usually runs smoothly
↓
Fridays in October are usually quieter than average
Weather at each end
ATL (origin)
Gusts 8 kt Ceiling 600 ft Visibility 5 mi Precip none
MIA (destination)
Gusts 19 kt Ceiling 1,700 ft Visibility 10+ mi Precip 0.03 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.