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

Thu, Oct 8: YX 5847 at 18:02 is the safest bet, 9% chance of being 15+ min late; the others run 10–20%.

Safest bet that day YX 5847 DTW 18:02 → GRR 19:07 · 9% chance 15+ min late Riskiest OO 3928 DTW 20:06 → GRR 21:07 · 20% chance 15+ min late

Every nonstop on Thu, Oct 8

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.


YX 5847 Republic	DTW 18:02	GRR 19:07	9%	6%	0.8%	no record
YX 5846 Republic	DTW 14:10	GRR 15:15	10%	5%	0.7%	no record
DL 3500 Delta flown by SkyWest Flight history →	DTW 08:50	GRR 09:54	15%	5%	0.8%	74%
OO 3928 SkyWest	DTW 20:06	GRR 21:07	20%	8%	0.7%	no record
DL 4880 Delta flown by Endeavor no forecast: 12-month record	DTW 22:55	GRR 23:57	21%	9%	2.8%	79%
DL 5390 Delta flown by Endeavor no forecast: 12-month record	DTW 12:56	GRR 13:55	31%	13%	0.0%	69%
DL 5473 Delta flown by Endeavor no forecast: 12-month record	DTW 10:21	GRR 11:21	31%	22%	1.9%	69%
DL 5511 Delta flown by Endeavor no forecast: 12-month record	DTW 16:11	GRR 17:14	42%	17%	2.0%	58%

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 Thu, Oct 8 (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