Saturday, October 10 · typical odds for a Saturday (too early for a weather forecast) · issued Sun 12:00 AM ET · 4 nonstops

Sat, Oct 10: WN 4527 at 10:05 is the safest bet, 12% chance of being 15+ min late; the others run 20–29%.

Safest bet that day WN 4527 STL 10:05 → BOS 13:45 · 12% chance 15+ min late Riskiest WN 1848 STL 16:52 → BOS 20:39 · 29% chance 15+ min late

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.


WN 4527 Southwest	STL 10:05	BOS 13:45	12%	2%	0.5%	no record
WN 4526 Southwest	STL 12:12	BOS 15:59	20%	4%	0.5%	no record
AA 4727 American flown by Republic Flight history →	STL 14:31	BOS 18:32	21%	7%	0.7%	81%
WN 1848 Southwest	STL 16:52	BOS 20:39	29%	7%	0.5%	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 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