Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sun 4:00 PM ET · 5 nonstops

Fri, Oct 9: WN 573 at 05:05 is the safest bet, 3% chance of being 15+ min late; evening flights run 21–25%.

Safest bet that day WN 573 BNA 05:05 → MDW 06:40 · 3% chance 15+ min late · usually 98% on time Riskiest WN 4286 BNA 20:25 → MDW 22:00 · 25% chance 15+ min late · usually 29% 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.


WN 573 Southwest Flight history →	BNA 05:05	MDW 06:40	3%	1%	0.6%	98%
WN 575 Southwest Flight history →	BNA 10:45	MDW 12:20	9%	2%	0.6%	44%
WN 2241 Southwest Flight history →	BNA 16:15	MDW 17:50	21%	5%	0.6%	27%
WN 578 Southwest Flight history →	BNA 22:35	MDW 00:10	24%	7%	0.6%	42%
WN 4286 Southwest Flight history →	BNA 20:25	MDW 22:00	25%	6%	0.6%	29%

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