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 2959 at 07:15 is the safest bet, 4% chance of being 15+ min late; evening flights run 24–26%.

Safest bet that day WN 2959 MDW 07:15 → BNA 08:40 · 4% chance 15+ min late · usually 70% on time Riskiest WN 1073 MDW 18:40 → BNA 20:10 · 26% chance 15+ min late · usually 50% 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 2959 Southwest Flight history →	MDW 07:15	BNA 08:40	4%	1%	0.6%	70%
WN 2733 Southwest Flight history →	MDW 11:20	BNA 12:45	13%	3%	0.6%	55%
WN 2199 Southwest Flight history →	MDW 17:05	BNA 18:35	24%	6%	0.6%	62%
WN 4091 Southwest Flight history →	MDW 21:40	BNA 23:10	25%	5%	0.6%	65%
WN 1073 Southwest Flight history →	MDW 18:40	BNA 20:10	26%	5%	0.6%	50%

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