Monday, October 12 · typical odds for a Monday (too early for a weather forecast) · issued Tue 12:00 AM ET · 5 nonstops

Mon, Oct 12: DL 1763 at 07:00 is the safest bet, 4% chance of being 15+ min late; the others run 10–28%.

Safest bet that day DL 1763 SJU 07:00 → ATL 10:58 · 4% chance 15+ min late · usually 96% on time Riskiest F9 2871 SJU 06:25 → ATL 10:25 · 28% chance 15+ min late · usually 54% on time

Every nonstop on Mon, Oct 12

12-month record →

Ranked by the chance of arriving 15+ minutes late (typical odds: the weather this date has had in past years), with each flight’s on-time record over Aug 2025 – Jul 2026 beside it. Times are local. Pick a flight for its forecast. Click a column to sort.


DL 1763 Delta Flight history →	SJU 07:00	ATL 10:58	4%	3%	1.0%	96%
DL 1946 Delta Flight history →	SJU 17:50	ATL 21:49	10%	4%	0.8%	88%
DL 1930 Delta Flight history →	SJU 12:56	ATL 16:53	11%	3%	0.9%	88%
DL 1882 Delta Flight history →	SJU 14:42	ATL 18:36	12%	4%	0.9%	87%
F9 2871 Frontier Flight history →	SJU 06:25	ATL 10:25	28%	9%	1.2%	54%

How these are worked out. Each flight’s odds are our forecast for that day (typical odds until the weather forecast covers it); flights of airlines we don’t forecast yet use their 12-month record and are marked. Makes the connection: the first flight’s 12-month lateness curve, scaled so its chance of arriving 15+ min late matches the day’s forecast, at the layover minus the 45-minute minimum (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled × second flight within 15 minutes, each from the day’s forecast.

About this data: forecast odds from our model for Mon, Oct 12 (newest published update); 12-month records from US DOT on-time data, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. JSON