The nonstop is quickest: United ORD → ONT (4h 31m), on time 3 times in 5. United via Denver (7h 42m) is more reliable, 87%, but takes 3h 11m longer.
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.
| United | 290 | 62% | 1.4% | 78 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 1 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.
| United | ORD | ONT | 4h 31m | 62% | 1.4% | 290 | Flying now |
Alternatives with one stop
All connections →| UnitedDetails → | ORD 08:40 → DEN 10:31UA 526 | 54m Denver | DEN 11:25 → ONT 12:47UA 430 | 6h 07m | 86% | 76% |
| DeltaDetails → | ORD 07:45 → SLC 10:15DL 2231 | 1h 04m Salt Lake City | SLC 11:19 → ONT 12:10DL 3172 | 6h 25m | 83% | 75% |
| AmericanDetails → | ORD 05:00 → DFW 07:30AA 760 | 50m Dallas-Fort Worth | DFW 08:20 → ONT 09:29AA 2238 | 6h 29m | 81% | 71% |
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