Airports › Ontario (ONT) › September 2024
Airport month · September 2024
Ontario International in September 2024
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 September 2024, reporting carriers scheduled 2,316 domestic departures from Ontario International (ONT). 85.5% left less than 15 minutes late and 86.4% reached their destination on time; 0.3% were cancelled.
Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so ONT departures were 1.1 points above the national departure figure.
A year earlier, in September 2023, the airport had 2,078 departures with 84.5% leaving on time: a change of +1.0 points, with flights up 11%.
Flights arriving at ONT that month were on time 82.1% of the time (2,315 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, air carrier 31% and national aviation system 15%.
- On time 86.4%
- Arrived 15+ minutes late 13.2%
- Cancelled 0.3%
- Diverted 0.1%
September 2024 against a year earlier, the airport's year and the nation
| Measure | Sep 2024 | Sep 2023 | ONT, 12 months to Jul 2026 | All reported flights, Sep 2024 |
|---|---|---|---|---|
| Departed on time | 85.5% | 84.5% | 80.3% | 84.4% |
| Arrived on time | 86.4% | 85.3% | 81.2% | 83.9% |
| Cancelled | 0.3% | 0.6% | 0.9% | 0.6% |
| Average departure delay (late minutes only) | 10.4 min | 11.2 min | 13.7 min | 10.6 min |
| Scheduled departures a day | 77 | 69 | 71 | 19,421 |
| Scheduled departures | 2,316 | 2,078 | 25,854 | 582,622 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 955 | 41% | 88.0% | -2.0 min | 0.3% |
| F9 Frontier Airlines | 329 | 14% | 78.4% | 7.9 min | 1.2% |
| AA American Airlines | 291 | 13% | 85.9% | 3.0 min | 0.0% |
| OO SkyWest Airlines | 262 | 11% | 85.5% | 0.5 min | 0.0% |
| UA United Airlines | 142 | 6% | 91.5% | -4.7 min | 0.0% |
| DL Delta Air Lines | 140 | 6% | 93.6% | -8.8 min | 0.0% |
| AS Alaska Airlines | 137 | 6% | 85.4% | 0.8 min | 0.0% |
| B6 JetBlue Airways | 30 | 1% | 90.0% | -12.5 min | 0.0% |
| HA Hawaiian Airlines | 30 | 1% | 80.0% | 1.5 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 262 | 88.2% | 0.3 min | 0.0% |
| ONT–DEN | Ontario to Denver | 249 | 90.4% | -3.2 min | 0.0% |
| ONT–LAS | Ontario to Las Vegas | 240 | 74.6% | 12.9 min | 1.3% |
| ONT–SEA | Ontario to Seattle | 224 | 82.1% | 3.2 min | 0.0% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 209 | 85.6% | 0.0 min | 0.0% |
| ONT–SMF | Ontario to Sacramento | 184 | 91.3% | -4.6 min | 0.5% |
| ONT–SFO | Ontario to San Francisco | 149 | 80.5% | 5.1 min | 0.0% |
| ONT–OAK | Ontario to Oakland | 132 | 93.2% | -5.9 min | 0.8% |
| ONT–SJC | Ontario to San Jose | 132 | 86.4% | -2.5 min | 0.8% |
| ONT–SLC | Ontario to Salt Lake City | 99 | 92.9% | -7.1 min | 0.0% |
| ONT–ATL | Ontario to Atlanta | 80 | 95.0% | -9.7 min | 0.0% |
| ONT–PDX | Ontario to Portland | 58 | 93.1% | -6.7 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in September 2024?
85.5% of 2,316 scheduled domestic departures left less than 15 minutes late, and 86.4% reached their destination on time. The national figures that month were 84.4% and 83.9%.
How does that compare with a year earlier?
In September 2023, 84.5% of 2,078 departures left on time and 0.6% were cancelled, against 85.5% and 0.3% in September 2024.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; 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.