Airports › Ontario (ONT) › January 2025
Airport month · January 2025
Ontario International in January 2025
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 January 2025, reporting carriers scheduled 1,941 domestic departures from Ontario International (ONT). 83.7% left less than 15 minutes late and 84.0% reached their destination on time; 2.0% were cancelled.
Nationally that month, 79.3% of flights departed on time and 78.6% arrived on time, so ONT departures were 4.4 points above the national departure figure.
A year earlier, in January 2024, the airport had 1,888 departures with 82.0% leaving on time: a change of +1.7 points, with flights up 3%.
Flights arriving at ONT that month were on time 82.4% of the time (1,944 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, air carrier 27% and national aviation system 18%.
- On time 84.0%
- Arrived 15+ minutes late 14.0%
- Cancelled 2.0%
- Diverted 0.1%
January 2025 against a year earlier, the airport's year and the nation
| Measure | Jan 2025 | Jan 2024 | ONT, 12 months to Jul 2026 | All reported flights, Jan 2025 |
|---|---|---|---|---|
| Departed on time | 83.7% | 82.0% | 80.3% | 79.3% |
| Arrived on time | 84.0% | 83.2% | 81.2% | 78.6% |
| Cancelled | 2.0% | 2.2% | 0.9% | 3.0% |
| Average departure delay (late minutes only) | 11.6 min | 14.5 min | 13.7 min | 14.0 min |
| Scheduled departures a day | 65 | 63 | 71 | 17,992 |
| Scheduled departures | 1,941 | 1,888 | 25,854 | 539,747 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 877 | 45% | 86.3% | -1.9 min | 1.6% |
| AA American Airlines | 214 | 11% | 81.3% | 4.3 min | 3.7% |
| OO SkyWest Airlines | 202 | 10% | 85.6% | 7.6 min | 1.5% |
| F9 Frontier Airlines | 185 | 10% | 74.6% | 13.4 min | 1.1% |
| UA United Airlines | 145 | 7% | 85.5% | -3.7 min | 2.1% |
| DL Delta Air Lines | 128 | 7% | 87.5% | -0.2 min | 3.1% |
| AS Alaska Airlines | 118 | 6% | 76.3% | 7.4 min | 2.5% |
| MQ Envoy Air | 41 | 2% | 90.2% | -5.2 min | 0.0% |
| HA Hawaiian Airlines | 31 | 2% | 80.6% | -3.3 min | 3.2% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 254 | 87.8% | 2.1 min | 1.2% |
| ONT–LAS | Ontario to Las Vegas | 221 | 78.3% | 10.8 min | 1.4% |
| ONT–DEN | Ontario to Denver | 208 | 79.3% | 1.2 min | 1.0% |
| ONT–SEA | Ontario to Seattle | 166 | 78.9% | 6.2 min | 1.8% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 156 | 80.1% | 3.1 min | 5.1% |
| ONT–SMF | Ontario to Sacramento | 156 | 88.5% | -6.6 min | 1.3% |
| ONT–OAK | Ontario to Oakland | 120 | 88.3% | -6.7 min | 0.8% |
| ONT–SJC | Ontario to San Jose | 102 | 90.2% | -6.5 min | 1.0% |
| ONT–SFO | Ontario to San Francisco | 101 | 90.1% | 6.0 min | 1.0% |
| ONT–SLC | Ontario to Salt Lake City | 97 | 90.7% | -0.6 min | 0.0% |
| ONT–PDX | Ontario to Portland | 86 | 82.6% | 5.2 min | 3.5% |
| ONT–ATL | Ontario to Atlanta | 66 | 84.8% | -1.6 min | 6.1% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in January 2025?
83.7% of 1,941 scheduled domestic departures left less than 15 minutes late, and 84.0% reached their destination on time. The national figures that month were 79.3% and 78.6%.
How does that compare with a year earlier?
In January 2024, 82.0% of 1,888 departures left on time and 2.2% were cancelled, against 83.7% and 2.0% in January 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for January 2025; 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.