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: AS 399 at 06:50 is the safest bet, 11% chance of being 15+ min late; the others run 20–35%.

Safest bet that day AS 399 SAN 06:50 → PDX 09:29 · 11% chance 15+ min late · usually 94% on time Riskiest WN 4908 SAN 15:00 → PDX 17:25 · 35% chance 15+ min late · usually 36% 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.


AS 399 Alaska Flight history →	SAN 06:50	PDX 09:29	11%	2%	0.9%	94%
AS 576 Alaska Flight history →	SAN 11:04	PDX 13:43	20%	3%	0.9%	88%
AS 1392 Alaska Flight history →	SAN 17:58	PDX 20:31	23%	5%	1.0%	84%
AS 1402 Alaska Flight history →	SAN 14:03	PDX 16:36	26%	5%	0.9%	86%worse than usual
WN 4908 Southwest Flight history →	SAN 15:00	PDX 17:25	35%	9%	0.6%	36%

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