Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Mon 12:00 PM ET · 4 nonstops

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

Safest bet that day DL 3990 MSP 08:25 → GRR 10:53 · 9% chance 15+ min late · usually 89% on time Riskiest DL 1711 MSP 21:40 → GRR 23:59 · 18% chance 15+ min late · usually 77% 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.


DL 3990 Delta flown by SkyWest Flight history →	MSP 08:25	GRR 10:53	9%	3%	0.6%	89%
DL 3865 Delta flown by SkyWest Flight history →	MSP 12:55	GRR 15:25	11%	5%	0.6%	76%
DL 1555 Delta Flight history →	MSP 16:02	GRR 18:26	14%	5%	0.6%	82%
DL 1711 Delta Flight history →	MSP 21:40	GRR 23:59	18%	7%	0.6%	77%

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