The best bet has a stop: Southwest via Phoenix (7h 20m) reaches Ontario on time 84% of the time, against 64% 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.
Airlines on this route
Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
| Southwest | 281 | 64% | 0.4% | 49 min |
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 flight on this route ran 150+ times in the year.
All 2 flights on this route →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 | BWI | ONT | 5h 30m | 64% | 0.4% | 281 | Flying now |
Alternatives with one stop
All connections →| SouthwestDetails → | BWI 07:00 → PHX 08:50WN 1049 | 1h 15m Phoenix | PHX 10:05 → ONT 11:20WN 431 | 7h 20m | 95% | 84% |
| DeltaDetails → | BWI 07:10 → SLC 09:49DL 1176 | 1h 30m Salt Lake City | SLC 11:19 → ONT 12:10DL 3172 | 8h 00m | 93% | 84% |
| UnitedDetails → | BWI 08:30 → DEN 10:25UA 2412 | 1h 00m Denver | DEN 11:25 → ONT 12:47UA 430 | 7h 17m | 90% | 80% |
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