Thursday, October 8 · typical odds for a Thursday (too early for a weather forecast) · issued Sun 12:00 PM ET · 4 nonstops

Thu, Oct 8: WN 863 at 05:56 is the safest bet, 5% chance of being 15+ min late; the others run 14–22%.

Safest bet that day WN 863 STL 05:56 → BOS 09:47 · 5% chance 15+ min late Riskiest AA 4727 STL 18:01 → BOS 21:59 · 22% chance 15+ min late · usually 81% on time

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.


WN 863 Southwest	STL 05:56	BOS 09:47	5%	1%	0.7%	no record
WN 485 Southwest	STL 10:21	BOS 14:20	14%	5%	0.6%	no record
MQ 3546 Envoy	STL 08:58	BOS 12:48	15%	5%	0.8%	no record
AA 4727 American flown by Republic Flight history →	STL 18:01	BOS 21:59	22%	11%	0.8%	81%

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