Today looks like a normal day here: all 3 nonstops are 53–58% likely to arrive 15+ min late.

Safest bet today WN 1031 BWI 19:30 → DAL 21:40 · 53% chance 15+ min late Riskiest WN 986 BWI 19:34 → DAL 21:10 · 58% chance 15+ min late

Against a calm day 56% average chance a nonstop arrives 15+ min late; 57% 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. 6 flights that already left today are not shown.


WN 1031 Southwest	BWI 19:30	DAL 21:40	53%	10%	0.6%	no record
WN 991 Southwest	BWI 20:38	DAL 23:00	58%	13%	0.6%	no record
WN 986 Southwest	BWI 19:34	DAL 21:10	58%	13%	0.6%	no record

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 Sun, Oct 4 (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