Leave before 9 am: 96% depart on time. After 4 pm it’s 63%.
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 6 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 4421 | OAK 06:02 | ONT 07:28 | 1h 25m | 50 | 98% | 0.0% | 31 min |
| WN 3062 | OAK 10:50 | ONT 12:10 | 1h 20m | 57 | 96% | 0.0% | 24 min |
| WN 381 | OAK 15:15 | ONT 16:35 | 1h 20m | 26 | 69% | 0.0% | 38 min |
| WN 645 | OAK 17:15 | ONT 18:35 | 1h 20m | 16 | 44% | 0.0% | 47 min |
| WN 271 | OAK 19:00 | ONT 20:20 | 1h 20m | 26 | 62% | 0.0% | 38 min |
| WN 449 | OAK 20:45 | ONT 22:08 | 1h 22m | 16 | 31% | 0.0% | 34 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 | OAK | ONT | 1h 20m | 83% | 0.4% | 1,471 | Flying now |
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