Sunday, October 11 · typical odds for a Sunday (too early for a weather forecast) · issued Mon 12:00 AM ET · 8 nonstops

Sun, Oct 11: DL 3039 at 08:13 is the safest bet, 10% chance of being 15+ min late; the others run 11–24%.

Safest bet that day DL 3039 CHA 08:13 → ATL 09:13 · 10% chance 15+ min late · usually 93% on time Riskiest DL 3124 CHA 18:21 → ATL 19:21 · 24% chance 15+ min late

Every nonstop on Sun, Oct 11

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. Dimmed: airlines we don’t forecast yet, shown with their 12-month record if they usually fly that weekday.


DL 3039 Delta Flight history →	CHA 08:13	ATL 09:13	10%	4%	0.7%	93%
DL 3057 Delta Flight history →	CHA 06:40	ATL 07:40	11%	5%	0.9%	70%
DL 1737 Delta Flight history →	CHA 13:10	ATL 14:08	17%	5%	0.9%	85%
DL 3141 Delta Flight history →	CHA 14:50	ATL 15:52	19%	6%	0.9%	77%
DL 3124 Delta	CHA 18:21	ATL 19:21	24%	7%	1.3%	no record
DL 5309 Delta flown by Endeavor no forecast: 12-month record	CHA 10:01	ATL 11:02	9%	4%	1.2%	91%
DL 5039 Delta flown by Endeavor no forecast: 12-month record	CHA 06:40	ATL 07:36	16%	12%	3.8%	84%
DL 5448 Delta flown by Endeavor no forecast: 12-month record	CHA 08:24	ATL 09:27	31%	16%	2.0%	69%

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 Sun, Oct 11 (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