Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Mon 12:00 PM ET · 3 nonstops

Fri, Oct 9: one nonstop, UA 3514 at 08:25, with a 6% chance of arriving 15+ min late.

Safest bet that day UA 3514 IAD 08:25 → BUF 09:51 · 6% chance 15+ min late · usually 97% on time

Every nonstop on Fri, Oct 9

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. Dimmed: airlines we don’t forecast yet, shown with their 12-month record if they usually fly that weekday.


UA 3514 United flown by Republic Flight history →	IAD 08:25	BUF 09:51	6%	2%	0.8%	97%
UA 4335 United flown by CommuteAir no forecast: 12-month record	IAD 12:59	BUF 14:25	18%	6%	2.6%	82%
UA 4823 United flown by CommuteAir no forecast: 12-month record	IAD 17:30	BUF 19:03	24%	11%	4.1%	76%

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 Fri, Oct 9 (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