Schedule: a typical summer Tuesday (the flights of Jul 28, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 1879
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29
DL 1879 · SJU → ATL
departs 6:00 AM AT · arrives 9:45 AM ET
Forecast issued Tue 10:00 PM ET · 16h after departure
Watch this flight
Other days
Tue 9/29
Today 8%
Mon 10/5 9%
Fri 10/9 6%
Odds over time
Arrive at ATL more than 15 minutes late?
5%
chance · ±0 pts
−1 pt · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
5%
Leave 15+ late
4%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at ATL more than 15 minutes late?
Calm-weather odds: 5% · changed −1 pt in 24h
−1 pt
5%
Yes 5%
No 95%
Leave SJU more than 15 minutes late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
4%
Yes 4%
No 96%
Arrive at ATL more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to ATL?
On time or early
95%
15–30 min late
<1%
30 min–1 hour late
2%
1–2 hours late
<1%
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
↑
Other factors
↑
ATL is busy at that time
↓
Mostly benign weather forecast at ATL
↓
Early flights usually leave on time
Weather at each end
SJU (origin)
Gusts 25 kt Ceiling 7,840 ft Visibility 10+ mi Precip none
ATL (destination)
Gusts 9 kt Ceiling none (clear) Visibility 10+ 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.