Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sat 8:00 PM ET · 3 nonstops

Fri, Oct 9: WN 4355 at 10:10 is the safest bet, 18% chance of being 15+ min late; the others run 27–33%.

Safest bet that day WN 4355 HOU 10:10 → FLL 13:40 · 18% chance 15+ min late · usually 79% on time Riskiest WN 4825 HOU 20:40 → FLL 00:10 · 33% chance 15+ min late · usually 54% 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 4355 Southwest Flight history →	HOU 10:10	FLL 13:40	18%	4%	2.4%	79%
WN 4253 Southwest Flight history →	HOU 13:25	FLL 16:55	27%	7%	1.7%	50%
WN 4825 Southwest Flight history →	HOU 20:40	FLL 00:10	33%	8%	1.7%	54%

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