Sunday, October 11 · typical odds for a Sunday (too early for a weather forecast) · issued Mon 12:00 AM ET · 3 nonstops

Sun, Oct 11: WN 3908 at 08:00 is the safest bet, 17% chance of being 15+ min late; the others run 38%.

Safest bet that day WN 3908 LAS 08:00 → STS 09:49 · 17% chance 15+ min late Riskiest AS 553 LAS 14:21 → STS 16:07 · 38% chance 15+ min late

Every nonstop on Sun, Oct 11

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 3908 Southwest	LAS 08:00	STS 09:49	17%	4%	0.7%	no record
AS 553 Alaska	LAS 14:21	STS 16:07	38%	10%	2.3%	no record
AS 2458 Alaska flown by Horizon no forecast: 12-month record	LAS 15:24	STS 17:16	20%	2%	3.8%	80%

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 Sun, Oct 11 (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