Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sun 4:00 PM ET · 4 nonstops

Fri, Oct 9 looks like a normal day here: all 2 nonstops are 14–20% likely to arrive 15+ min late.

Safest bet that day DL 4120 DTW 10:20 → ROC 11:45 · 14% chance 15+ min late · usually 81% on time Riskiest DL 3148 DTW 21:30 → ROC 22:47 · 20% chance 15+ min late · usually 74% on time

Every nonstop on Fri, Oct 9

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 4120 Delta flown by SkyWest Flight history →	DTW 10:20	ROC 11:45	14%	6%	0.6%	81%
DL 3148 Delta Flight history →	DTW 21:30	ROC 22:47	20%	6%	0.9%	74%
DL 5240 Delta flown by Endeavor no forecast: 12-month record	DTW 07:45	ROC 09:08	14%	4%	1.0%	86%
DL 5211 Delta flown by Endeavor no forecast: 12-month record	DTW 14:25	ROC 15:48	28%	10%	1.7%	72%

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 Fri, Oct 9 (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