Saturday, October 10 · typical odds for a Saturday (too early for a weather forecast) · issued Sun 8:00 PM ET · 3 nonstops

Sat, Oct 10: YX 4667 at 06:26 is the safest bet, 6% chance of being 15+ min late; the others run 22–23%.

Safest bet that day YX 4667 STL 06:26 → PHL 09:57 · 6% chance 15+ min late Riskiest AA 1739 STL 13:23 → PHL 16:51 · 23% chance 15+ min late · usually 83% on time

Every nonstop on Sat, Oct 10

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.


YX 4667 Republic	STL 06:26	PHL 09:57	6%	2%	0.6%	no record
WN 1911 Southwest	STL 16:52	PHL 20:08	22%	5%	0.5%	no record
AA 1739 American Flight history →	STL 13:23	PHL 16:51	23%	6%	0.6%	83%

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 Sat, Oct 10 (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