Saturday, October 10 · typical odds for a Saturday (too early for a weather forecast) · issued Sun 8:00 PM ET · 3 nonstops

Sat, Oct 10 looks like a normal day here: all 3 nonstops are 11–17% likely to arrive 15+ min late.

Safest bet that day DL 1255 MDT 06:36 → ATL 08:35 · 11% chance 15+ min late · usually 91% on time Riskiest DL 2857 MDT 18:22 → ATL 20:35 · 17% chance 15+ min late · usually 83% on time

Every nonstop on Sat, Oct 10

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 06:36	ATL 08:35	11%	3%	0.8%	91%
DL 1248 Delta Flight history →	MDT 12:30	ATL 14:29	13%	3%	0.8%	86%
DL 2857 Delta Flight history →	MDT 18:22	ATL 20:35	17%	6%	1.8%	83%

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 Sat, Oct 10 (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