Wednesday, October 7 · typical odds for a Wednesday (too early for a weather forecast) · issued Sat 12:00 PM ET · 6 nonstops

Wed, Oct 7 looks like a normal day here: all 3 nonstops are 9–17% likely to arrive 15+ min late.

Safest bet that day WN 4079 MDW 08:39 → DTW 10:45 · 9% chance 15+ min late Riskiest WN 106 MDW 18:19 → DTW 20:25 · 17% chance 15+ min late

Every nonstop on Wed, Oct 7

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.


WN 4079 Southwest	MDW 08:39	DTW 10:45	9%	2%	1.1%	no record
WN 4225 Southwest	MDW 12:54	DTW 15:00	13%	3%	1.1%	no record
WN 106 Southwest	MDW 18:19	DTW 20:25	17%	4%	0.8%	no record
DL 4674 Delta flown by Endeavor no forecast: 12-month record	MDW 09:17	DTW 11:35	16%	9%	0.0%	84%
DL 4688 Delta flown by Endeavor no forecast: 12-month record	MDW 13:26	DTW 15:44	19%	13%	1.2%	81%
DL 4690 Delta flown by Endeavor no forecast: 12-month record	MDW 18:58	DTW 21:16	43%	20%	1.8%	57%

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 Wed, Oct 7 (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