Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sat 8:00 PM ET · 3 nonstops

Fri, Oct 9: UA 1825 at 08:20 is the safest bet, 13% chance of being 15+ min late; evening flights run 26–52%.

Safest bet that day UA 1825 IAD 08:20 → FLL 11:07 · 13% chance 15+ min late · usually 89% on time Riskiest F9 2959 IAD 18:09 → FLL 20:52 · 52% chance 15+ min late · usually 53% on time

Every nonstop on Fri, Oct 9

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 1825 United Flight history →	IAD 08:20	FLL 11:07	13%	3%	0.8%	89%
UA 1379 United Flight history →	IAD 17:42	FLL 20:32	26%	9%	2.5%	81%
F9 2959 Frontier Flight history →	IAD 18:09	FLL 20:52	52%	19%	4.9%	53%

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