Today looks like a normal day here: all 3 nonstops are 21–26% likely to arrive 15+ min late.

Safest bet today WN 4764 MDW 14:50 → RSW 18:40 · 21% chance 15+ min late · usually 65% on time Riskiest WN 2881 MDW 18:55 → RSW 22:45 · 26% chance 15+ min late · usually 51% on time

Against a calm day 25% average chance a nonstop arrives 15+ min late; 21% for the same flights on a calm-weather day

Every nonstop today

12-month record →

Ranked by the chance of arriving 15+ minutes late, 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. 3 flights that already left today are not shown.


WN 4764 Southwest Flight history →	MDW 14:50	RSW 18:40	21%	4%	0.4%	65%
WN 2977 Southwest	MDW 18:50	RSW 22:40	26%	5%	0.6%	no record
WN 2881 Southwest Flight history →	MDW 18:55	RSW 22:45	26%	5%	0.6%	51%

How these are worked out. Each flight’s odds are our forecast for that day; 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 Mon, Oct 5 (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