Wednesday, October 7 · typical odds for a Wednesday (too early for a weather forecast) · issued Sat 12:00 PM ET · 4 nonstops

Wed, Oct 7: WN 744 at 07:26 is the safest bet, 10% chance of being 15+ min late; the others run 14–44%.

Safest bet that day WN 744 BOS 07:26 → MDW 08:54 · 10% chance 15+ min late Riskiest WN 672 BOS 19:13 → MDW 20:40 · 44% 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.


WN 744 Southwest	BOS 07:26	MDW 08:54	10%	2%	1.1%	no record
WN 1645 Southwest	BOS 10:09	MDW 11:37	14%	2%	1.0%	no record
WN 746 Southwest Flight history →	BOS 15:20	MDW 16:48	33%	8%	1.0%	66%
WN 672 Southwest	BOS 19:13	MDW 20:40	44%	16%	1.2%	no record

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