Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Mon 12:00 PM ET · connections flying that day

Fri, Oct 9: one nonstop, WN 1228 at 14:40, with a 21% chance of arriving 15+ min late.

Nonstops that day

All 1 nonstop →


WN 1228 Southwest Flight history →	COS 14:40	MDW 18:00	21%	6%	0.7%	43%

Best connections that day, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Chicago on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival (Chicago is 1 h ahead of Colorado Springs). Layovers up to 4 hours. Pick a connection for its 12-month details.


Southwest Details →	COS 06:10 → LAS 07:05WN 3313	1h 15m Las Vegas	LAS 08:20 → MDW 13:55WN 2271	6h 45m	98%	88%
Southwest Details →	COS 05:10 → DAL 08:00WN 1218	2h 05m Dallas	DAL 10:05 → MDW 12:20WN 1357	6h 10m	100%	88%
Southwest Details →	COS 05:45 → DEN 06:45WN 1220	3h 15m Denver	DEN 10:00 → MDW 13:25WN 755	6h 40m	98%	87%
Southwest Details →	COS 06:45 → PHX 07:35WN 4256	2h 25m Phoenix	PHX 10:00 → MDW 15:15WN 4066	7h 30m	98%	79%
Delta Details →	COS 13:40 → ATL 18:44DL 2427	2h 31m Atlanta	ATL 21:15 → MDW 22:15DL 1076	7h 35m	96%	77%
Southwest Details →	COS 11:10 → DEN 12:05WN 4325	3h 45m Denver	DEN 15:50 → MDW 19:15WN 1603	7h 05m	100%	76%
Southwest Details →	COS 16:55 → DEN 17:45WN 1222	3h 05m Denver	DEN 20:50 → MDW 00:15 +1WN 1615	6h 20m	97%	73%
Southwest Details →	COS 16:40 → DAL 19:30WN 1219	3h 20m Dallas	DAL 22:50 → MDW 01:05 +1WN 1359	7h 25m	100%	70%

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