Sunday, October 11 · typical odds for a Sunday (too early for a weather forecast) · issued Mon 12:00 AM ET · 5 nonstops

Sun, Oct 11: WN 1634 at 05:30 is the safest bet, 4% chance of being 15+ min late; evening flights run 28%.

Safest bet that day WN 1634 PIT 05:30 → DEN 06:52 · 4% chance 15+ min late Riskiest WN 4287 PIT 18:40 → DEN 20:04 · 28% chance 15+ min late

Every nonstop on Sun, Oct 11

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 1634 Southwest	PIT 05:30	DEN 06:52	4%	1%	0.6%	no record
UA 1765 United Flight history →	PIT 08:30	DEN 10:01	7%	4%	0.7%	92%
WN 3507 Southwest	PIT 12:10	DEN 13:39	13%	4%	0.6%	no record
UA 1816 United Flight history →	PIT 16:48	DEN 18:29	28%	10%	0.9%	86%worse than usual
WN 4287 Southwest	PIT 18:40	DEN 20:04	28%	9%	0.6%	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 Sun, Oct 11 (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