Airports › Ontario (ONT) › August 2023
Airport month · August 2023
Ontario International in August 2023
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In August 2023, reporting carriers scheduled 2,201 domestic departures from Ontario International (ONT). 76.3% left less than 15 minutes late and 77.1% reached their destination on time; 3.2% were cancelled.
Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so ONT departures were level with the national departure figure.
Flights arriving at ONT that month were on time 70.0% of the time (2,202 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 42% and national aviation system 14%.
- On time 77.1%
- Arrived 15+ minutes late 19.5%
- Cancelled 3.2%
- Diverted 0.2%
August 2023 against a year earlier, the airport's year and the nation
| Measure | Aug 2023 | Year earlier | ONT, 12 months to Jul 2026 | All reported flights, Aug 2023 |
|---|---|---|---|---|
| Departed on time | 76.3% | — | 80.3% | 76.7% |
| Arrived on time | 77.1% | — | 81.2% | 76.9% |
| Cancelled | 3.2% | — | 0.9% | 1.5% |
| Average departure delay (late minutes only) | 18.9 min | — | 13.7 min | 17.3 min |
| Scheduled departures a day | 73 | — | 71 | 20,100 |
| Scheduled departures | 2,201 | — | 25,854 | 602,987 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 1,030 | 47% | 77.8% | 4.9 min | 4.0% |
| AA American Airlines | 298 | 14% | 79.9% | 29.4 min | 0.7% |
| DL Delta Air Lines | 237 | 11% | 83.5% | 6.5 min | 1.3% |
| F9 Frontier Airlines | 228 | 10% | 66.2% | 13.3 min | 8.8% |
| AS Alaska Airlines | 147 | 7% | 81.6% | 1.2 min | 0.7% |
| UA United Airlines | 115 | 5% | 73.9% | 4.7 min | 0.0% |
| OO SkyWest Airlines | 83 | 4% | 89.2% | -2.3 min | 1.2% |
| B6 JetBlue Airways | 31 | 1% | 41.9% | 113.0 min | 9.7% |
| HA Hawaiian Airlines | 31 | 1% | 48.4% | 17.9 min | 0.0% |
| MQ Envoy Air | 1 | 0% | 100.0% | -25.0 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–DEN | Ontario to Denver | 264 | 79.5% | 5.7 min | 3.8% |
| ONT–LAS | Ontario to Las Vegas | 244 | 66.4% | 11.2 min | 5.7% |
| ONT–PHX | Ontario to Phoenix | 239 | 79.9% | 10.2 min | 3.8% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 233 | 73.8% | 26.5 min | 2.6% |
| ONT–SEA | Ontario to Seattle | 213 | 82.6% | 8.8 min | 0.0% |
| ONT–SMF | Ontario to Sacramento | 162 | 82.7% | -0.5 min | 3.7% |
| ONT–OAK | Ontario to Oakland | 143 | 77.6% | 5.5 min | 3.5% |
| ONT–SJC | Ontario to San Jose | 143 | 81.8% | 2.9 min | 2.8% |
| ONT–ATL | Ontario to Atlanta | 121 | 82.6% | -2.0 min | 3.3% |
| ONT–SFO | Ontario to San Francisco | 120 | 71.7% | 6.8 min | 3.3% |
| ONT–SLC | Ontario to Salt Lake City | 93 | 86.0% | -2.1 min | 1.1% |
| ONT–AUS | Ontario to Austin | 31 | 83.9% | 4.0 min | 3.2% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in August 2023?
76.3% of 2,201 scheduled domestic departures left less than 15 minutes late, and 77.1% reached their destination on time. The national figures that month were 76.7% and 76.9%.
How does that compare with a year earlier?
August 2022 is outside the 36 months on file, or the airport had too few reported flights that month.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2023; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for ONT · methodology · corrections.