Thursday, October 8 · typical odds for a Thursday (too early for a weather forecast) · issued Sun 12:00 PM ET · 3 nonstops

Thu, Oct 8 looks like a normal day here: all 3 nonstops are 23–27% likely to arrive 15+ min late.

Safest bet that day UA 2661 SFO 10:40 → ONT 12:12 · 23% chance 15+ min late · usually 78% on time Riskiest OO 5571 SFO 13:45 → ONT 15:23 · 27% chance 15+ min late

Every nonstop on Thu, Oct 8

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.


UA 2661 United Flight history →	SFO 10:40	ONT 12:12	23%	7%	0.6%	78%
OO 5467 SkyWest	SFO 16:14	ONT 17:51	26%	12%	0.8%	no record
OO 5571 SkyWest	SFO 13:45	ONT 15:23	27%	13%	0.8%	no record

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 Thu, Oct 8 (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