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: UA 1256 at 08:48 is the safest bet, 8% chance of being 15+ min late; evening flights run 18–23%.

Safest bet that day UA 1256 TYS 08:48 → DEN 10:12 · 8% chance 15+ min late · usually 93% on time Riskiest WN 4254 TYS 17:31 → DEN 18:42 · 23% 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 1256 United Flight history →	TYS 08:48	DEN 10:12	8%	2%	0.8%	93%
G4 3020 Allegiant	TYS 06:29	DEN 07:50	9%	3%	0.7%	no record
UA 2411 United	TYS 16:53	DEN 18:00	18%	5%	0.8%	no record
WN 4254 Southwest	TYS 17:31	DEN 18:42	23%	4%	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 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