Airports › Ontario (ONT) › March 2025
Airport month · March 2025
Ontario International in March 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 March 2025, reporting carriers scheduled 2,107 domestic departures from Ontario International (ONT). 84.9% left less than 15 minutes late and 84.9% reached their destination on time; 0.6% were cancelled.
Nationally that month, 79.9% of flights departed on time and 79.3% arrived on time, so ONT departures were 5.0 points above the national departure figure.
A year earlier, in March 2024, the airport had 2,022 departures with 80.9% leaving on time: a change of +4.0 points, with flights up 4%.
Flights arriving at ONT that month were on time 81.5% of the time (2,108 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, national aviation system 26% and air carrier 25%.
- On time 84.9%
- Arrived 15+ minutes late 14.2%
- Cancelled 0.6%
- Diverted 0.3%
March 2025 against a year earlier, the airport's year and the nation
| Measure | Mar 2025 | Mar 2024 | ONT, 12 months to Jul 2026 | All reported flights, Mar 2025 |
|---|---|---|---|---|
| Departed on time | 84.9% | 80.9% | 80.3% | 79.9% |
| Arrived on time | 84.9% | 81.5% | 81.2% | 79.3% |
| Cancelled | 0.6% | 0.3% | 0.9% | 1.2% |
| Average departure delay (late minutes only) | 9.0 min | 15.1 min | 13.7 min | 14.9 min |
| Scheduled departures a day | 70 | 67 | 71 | 20,029 |
| Scheduled departures | 2,107 | 2,022 | 25,854 | 600,872 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 972 | 46% | 86.8% | -1.2 min | 0.2% |
| AA American Airlines | 306 | 15% | 84.3% | -2.9 min | 1.3% |
| OO SkyWest Airlines | 213 | 10% | 83.6% | -2.8 min | 1.4% |
| F9 Frontier Airlines | 206 | 10% | 73.3% | 8.9 min | 1.0% |
| DL Delta Air Lines | 124 | 6% | 91.1% | -6.2 min | 0.0% |
| UA United Airlines | 124 | 6% | 86.3% | -4.3 min | 0.8% |
| AS Alaska Airlines | 103 | 5% | 83.5% | -3.5 min | 0.0% |
| HA Hawaiian Airlines | 31 | 1% | 80.6% | -4.5 min | 0.0% |
| MQ Envoy Air | 28 | 1% | 92.9% | -4.6 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 291 | 84.9% | 0.7 min | 0.3% |
| ONT–LAS | Ontario to Las Vegas | 219 | 78.1% | 8.1 min | 0.9% |
| ONT–DEN | Ontario to Denver | 213 | 85.4% | -2.4 min | 0.0% |
| ONT–SEA | Ontario to Seattle | 183 | 84.7% | -5.7 min | 0.0% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 181 | 79.6% | -1.0 min | 2.2% |
| ONT–SMF | Ontario to Sacramento | 179 | 90.5% | -3.9 min | 0.0% |
| ONT–OAK | Ontario to Oakland | 136 | 93.4% | -8.8 min | 0.0% |
| ONT–SFO | Ontario to San Francisco | 117 | 67.5% | 10.5 min | 2.6% |
| ONT–SJC | Ontario to San Jose | 107 | 89.7% | -4.5 min | 0.0% |
| ONT–SLC | Ontario to Salt Lake City | 91 | 96.7% | -8.1 min | 0.0% |
| ONT–ATL | Ontario to Atlanta | 62 | 87.1% | -4.9 min | 0.0% |
| ONT–IAH | Ontario to Houston | 59 | 74.6% | 5.6 min | 1.7% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in March 2025?
84.9% of 2,107 scheduled domestic departures left less than 15 minutes late, and 84.9% reached their destination on time. The national figures that month were 79.9% and 79.3%.
How does that compare with a year earlier?
In March 2024, 80.9% of 2,022 departures left on time and 0.3% were cancelled, against 84.9% and 0.6% in March 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for March 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.