Airports › Ontario (ONT) › December 2024
Airport month · December 2024
Ontario International in December 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 December 2024, reporting carriers scheduled 2,116 domestic departures from Ontario International (ONT). 84.4% left less than 15 minutes late and 84.7% reached their destination on time; 0.3% were cancelled.
Nationally that month, 77.8% of flights departed on time and 78.1% arrived on time, so ONT departures were 6.6 points above the national departure figure.
A year earlier, in December 2023, the airport had 2,084 departures with 87.3% leaving on time: a change of −2.9 points, with flights up 2%.
Flights arriving at ONT that month were on time 82.4% of the time (2,114 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, air carrier 34% and national aviation system 18%.
- On time 84.7%
- Arrived 15+ minutes late 14.5%
- Cancelled 0.3%
- Diverted 0.4%
December 2024 against a year earlier, the airport's year and the nation
| Measure | Dec 2024 | Dec 2023 | ONT, 12 months to Jul 2026 | All reported flights, Dec 2024 |
|---|---|---|---|---|
| Departed on time | 84.4% | 87.3% | 80.3% | 77.8% |
| Arrived on time | 84.7% | 88.3% | 81.2% | 78.1% |
| Cancelled | 0.3% | 0.1% | 0.9% | 0.7% |
| Average departure delay (late minutes only) | 11.5 min | 8.3 min | 13.7 min | 16.6 min |
| Scheduled departures a day | 71 | 70 | 71 | 19,686 |
| Scheduled departures | 2,116 | 2,084 | 25,854 | 590,581 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 929 | 44% | 85.4% | 1.0 min | 0.0% |
| AA American Airlines | 305 | 14% | 82.0% | 9.7 min | 1.0% |
| F9 Frontier Airlines | 219 | 10% | 79.9% | -0.8 min | 0.5% |
| OO SkyWest Airlines | 211 | 10% | 82.0% | -0.7 min | 0.5% |
| DL Delta Air Lines | 150 | 7% | 94.7% | -1.1 min | 0.0% |
| AS Alaska Airlines | 120 | 6% | 81.7% | 3.1 min | 0.8% |
| UA United Airlines | 117 | 6% | 88.0% | -4.2 min | 0.9% |
| MQ Envoy Air | 34 | 2% | 94.1% | -5.1 min | 0.0% |
| HA Hawaiian Airlines | 31 | 1% | 87.1% | 5.7 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 282 | 90.8% | -1.5 min | 0.0% |
| ONT–LAS | Ontario to Las Vegas | 227 | 88.1% | -3.5 min | 0.0% |
| ONT–DEN | Ontario to Denver | 223 | 89.2% | -3.9 min | 0.0% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 193 | 72.5% | 20.6 min | 1.6% |
| ONT–SEA | Ontario to Seattle | 174 | 85.1% | -3.8 min | 0.6% |
| ONT–SMF | Ontario to Sacramento | 167 | 87.4% | 1.3 min | 0.0% |
| ONT–SFO | Ontario to San Francisco | 140 | 72.1% | 9.8 min | 1.4% |
| ONT–OAK | Ontario to Oakland | 125 | 81.6% | 0.1 min | 0.0% |
| ONT–SJC | Ontario to San Jose | 108 | 85.2% | -3.2 min | 0.0% |
| ONT–SLC | Ontario to Salt Lake City | 94 | 93.6% | 6.1 min | 0.0% |
| ONT–ATL | Ontario to Atlanta | 88 | 96.6% | -12.7 min | 0.0% |
| ONT–PDX | Ontario to Portland | 52 | 78.8% | 2.3 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in December 2024?
84.4% of 2,116 scheduled domestic departures left less than 15 minutes late, and 84.7% reached their destination on time. The national figures that month were 77.8% and 78.1%.
How does that compare with a year earlier?
In December 2023, 87.3% of 2,084 departures left on time and 0.1% were cancelled, against 84.4% and 0.3% in December 2024.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 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.