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 1879
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2
DL 1879 · SJU → ATL
departs 6:00 AM AT · arrives 9:45 AM ET
Forecast issued Fri 10:00 PM ET · 16h after departure
Watch this flight
Other days
Fri 10/2
Today 11%
Mon 10/5 8%
Fri 10/9 6%
Odds over time
Arrive at ATL more than 15 minutes late?
6%
chance · ±0 pts
−7 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
6%
Leave 15+ late
4%
Arrive 1h+ late
3%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
3.3d
2d
1d
12h
6h
Departs
Lands
Arrive at ATL more than 15 minutes late?
Calm-weather odds: 6% · changed −7 pts in 24h
−7 pts
6%
Yes 6%
No 94%
Leave SJU more than 15 minutes late?
Calm-weather odds: 4% · changed −8 pts in 24h
−8 pts
4%
Yes 4%
No 96%
Arrive at ATL more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed −4 pts in 24h
−4 pts
<1%
Yes <1%
No 99%
How late will it get to ATL?
On time or early
93%
15–30 min late
2%
30 min–1 hour late
<1%
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
↑
Mostly benign weather forecast at SJU
↓
Early flights usually leave on time
↓
This flight has been late 6% of the time recently
Weather at each end
SJU (origin)
Gusts 22 kt Ceiling none (clear) Visibility 10+ mi Precip none
ATL (destination)
Gusts 8 kt Ceiling 600 ft Visibility 5 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.