Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sat 8:00 PM ET · 4 nonstops

Fri, Oct 9: UA 3656 at 06:05 is the safest bet, 4% chance of being 15+ min late; the others run 20%.

Safest bet that day UA 3656 LGA 06:05 → IAD 07:31 · 4% chance 15+ min late · usually 93% on time Riskiest UA 3688 LGA 14:51 → IAD 16:35 · 20% chance 15+ min late · usually 63% 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. Dimmed: airlines we don’t forecast yet, shown with their 12-month record if they usually fly that weekday.


UA 3656 United flown by Republic Flight history →	LGA 06:05	IAD 07:31	4%	2%	0.9%	93%
UA 3688 United flown by Republic Flight history →	LGA 14:51	IAD 16:35	20%	8%	1.0%	63%
UA 6242 United flown by Mesa no forecast: 12-month record	LGA 10:29	IAD 11:55	18%	7%	4.3%	82%
UA 6244 United flown by Mesa no forecast: 12-month record	LGA 19:28	IAD 20:55	31%	22%	14.7%	69%

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