Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sun 4:00 PM ET · connections flying that day

Fri, Oct 9: one nonstop, WN 3247 at 16:20, with a 29% chance of arriving 15+ min late.

Nonstops that day

All 1 nonstop →


WN 3247 Southwest Flight history →	ONT 16:20	DAL 21:15	29%	9%	0.8%	58%

Best connections that day, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Dallas on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival (Dallas is 2 h ahead of Ontario). Layovers up to 4 hours. Pick a connection for its 12-month details.


Southwest Details →	ONT 05:30 → LAS 06:35WN 3150	1h 15m Las Vegas	LAS 07:50 → DAL 12:40WN 1317	5h 10m	99%	88%
Southwest Details →	ONT 05:15 → PHX 06:30WN 864	1h 30m Phoenix	PHX 08:00 → DAL 12:25WN 875	5h 10m	96%	86%
Southwest Details →	ONT 05:50 → DEN 09:05WN 3144	1h 00m Denver	DEN 10:05 → DAL 13:10WN 1518	5h 20m	95%	83%
Southwest Details →	ONT 08:00 → PHX 09:15WN 4421	1h 40m Phoenix	PHX 10:55 → DAL 15:20WN 3255	5h 20m	100%	82%
Southwest Details →	ONT 06:30 → SJC 07:50WN 383	3h 50m San Jose	SJC 11:40 → DAL 17:05WN 965	8h 35m	100%	78%
Southwest Details →	ONT 08:35 → LAS 09:40WN 2333	1h 10m Las Vegas	LAS 10:50 → DAL 15:40WN 2218	5h 05m	96%	78%
Southwest Details →	ONT 06:10 → OAK 07:35WN 3042	3h 25m Oakland	OAK 11:00 → DAL 16:25WN 3014	8h 15m	100%	76%
Delta Details →	ONT 07:05 → ATL 14:23DL 761	2h 21m Atlanta	ATL 16:44 → DAL 17:54DL 2780	8h 49m	98%	75%
Tight connection: often missed
Southwest Details →	ONT 12:40 → LAS 13:45WN 3151	55m Las Vegas	LAS 14:40 → DAL 19:25WN 4489	4h 45m	62%	40%
Southwest Details →	ONT 12:45 → PHX 14:00WN 3062	50m Phoenix	PHX 14:50 → DAL 19:15WN 1937	4h 30m	53%	38%
Southwest Details →	ONT 16:40 → LAS 17:45WN 2213	1h 00m Las Vegas	LAS 18:45 → DAL 23:30WN 2221	4h 50m	61%	36%

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