Monday, October 12 · typical odds for a Monday (too early for a weather forecast) · issued Tue 8:00 PM ET · 4 nonstops

Mon, Oct 12 looks like a normal day here: all 4 nonstops are 9–18% likely to arrive 15+ min late.

Safest bet that day DL 1255 MDT 06:04 → ATL 08:02 · 9% chance 15+ min late · usually 91% on time Riskiest DL 1354 MDT 14:59 → ATL 17:12 · 18% chance 15+ min late

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 1255 Delta Flight history →	MDT 06:04	ATL 08:02	9%	2%	1.0%	91%
DL 1248 Delta Flight history →	MDT 11:41	ATL 13:42	10%	3%	1.0%	86%
DL 2857 Delta Flight history →	MDT 18:02	ATL 20:16	17%	7%	0.9%	83%
DL 1354 Delta	MDT 14:59	ATL 17:12	18%	6%	1.0%	no record

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