Thursday, October 8 · typical odds for a Thursday (too early for a weather forecast) · issued Sun 12:00 PM ET · 5 nonstops

Thu, Oct 8: WN 1673 at 05:51 is the safest bet, 2% chance of being 15+ min late; the others run 5–18%.

Safest bet that day WN 1673 DEN 05:51 → MDW 09:14 · 2% chance 15+ min late Riskiest WN 2565 DEN 18:00 → MDW 21:27 · 18% 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.


WN 1673 Southwest	DEN 05:51	MDW 09:14	2%	1%	0.7%	no record
WN 1674 Southwest	DEN 07:51	MDW 11:14	5%	1%	0.6%	no record
WN 1675 Southwest	DEN 10:31	MDW 13:56	8%	2%	0.6%	no record
WN 1676 Southwest	DEN 14:40	MDW 18:05	14%	5%	0.6%	no record
WN 2565 Southwest	DEN 18:00	MDW 21:27	18%	5%	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