The best bet has a stop: Southwest via Phoenix (6h 10m) reaches Ontario on time 86% of the time, against 70% on the nonstop.
Time of day × airport
Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).
Pick an hour to see this route’s flights leaving then.
Flights, best and worst
Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.
No Southwest flight on this route ran 150+ times in the year.
All 1 Southwest flights in the current schedule
Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
| WN 2846 | MDW 11:45 | ONT 13:50 | 4h 05m | 42 | 55% | 0.0% | 48 min |
Nonstops by airline and airport
Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.
| Southwest | MDW | ONT | 4h 15m | 71% | 1.1% | 360 | Flying now |
Alternatives with one stop
All connections →| SouthwestDetails → | MDW 07:10 → PHX 08:45WN 2520 | 1h 20m Phoenix | PHX 10:05 → ONT 11:20WN 431 | 6h 10m | 100% | 86% |
| SouthwestDetails → | MDW 05:15 → DEN 06:50WN 2989 | 1h 00m Denver | DEN 07:50 → ONT 09:10WN 1660 | 5h 55m | 98% | 83% |
| SouthwestDetails → | MDW 05:20 → PHX 06:55WN 2858 | 55m Phoenix | PHX 07:50 → ONT 09:05WN 759 | 5h 45m | 85% | 79% |
About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON