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 1791
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2
DL 1791 · ATL → SJU
departs 4:59 PM ET · arrives 8:45 PM AT
Forecast issued Fri 10:00 PM ET · 5h after departure
Watch this flight
Other days
Fri 10/2
Today 48%
Mon 10/5 13%
Fri 10/9 22%
Odds over time
Arrive at SJU more than 15 minutes late?
21%
chance · ±1 pts
−9 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
21%
Leave 15+ late
25%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
3.8d
2d
1d
12h
6h
Departs
Lands
Now
Arrive at SJU more than 15 minutes late?
Calm-weather odds: 22% · changed −9 pts in 24h
−9 pts
21%
Yes 21%
No 79%
Leave ATL more than 15 minutes late?
Calm-weather odds: 26% · changed −7 pts in 24h
−7 pts
25%
Yes 25%
No 75%
Arrive at SJU more than an hour late?
Calm-weather odds: 6% · changed −5 pts in 24h
−5 pts
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SJU?
On time or early
78%
15–30 min late
9%
30 min–1 hour late
6%
1–2 hours late
5%
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
↑
4pm departures from ATL are often late
↑
This flight has been late 32% of the time recently
↑
Mostly benign weather forecast at SJU
↓
ATL usually runs smoothly
↓
Cloud base down to 600 ft forecast at ATL that day
Weather at each end
ATL (origin)
Gusts 8 kt Ceiling 600 ft Visibility 5 mi Precip none
SJU (destination)
Gusts 22 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.