Airports › Ontario (ONT) › April 2025
Airport month · April 2025
Ontario International in April 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 April 2025, reporting carriers scheduled 2,250 domestic departures from Ontario International (ONT). 86.1% left less than 15 minutes late and 85.3% reached their destination on time; 0.4% were cancelled.
Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so ONT departures were 5.5 points above the national departure figure.
A year earlier, in April 2024, the airport had 2,098 departures with 82.0% leaving on time: a change of +4.1 points, with flights up 7%.
Flights arriving at ONT that month were on time 82.0% of the time (2,249 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, national aviation system 25% and air carrier 25%.
- On time 85.3%
- Arrived 15+ minutes late 14.0%
- Cancelled 0.4%
- Diverted 0.2%
April 2025 against a year earlier, the airport's year and the nation
| Measure | Apr 2025 | Apr 2024 | ONT, 12 months to Jul 2026 | All reported flights, Apr 2025 |
|---|---|---|---|---|
| Departed on time | 86.1% | 82.0% | 80.3% | 80.6% |
| Arrived on time | 85.3% | 82.7% | 81.2% | 79.5% |
| Cancelled | 0.4% | 0.5% | 0.9% | 0.8% |
| Average departure delay (late minutes only) | 10.1 min | 12.3 min | 13.7 min | 14.1 min |
| Scheduled departures a day | 75 | 70 | 71 | 19,465 |
| Scheduled departures | 2,250 | 2,098 | 25,854 | 583,950 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 995 | 44% | 86.5% | 1.0 min | 0.0% |
| AA American Airlines | 319 | 14% | 83.4% | 1.6 min | 1.9% |
| OO SkyWest Airlines | 295 | 13% | 91.9% | -8.0 min | 0.0% |
| F9 Frontier Airlines | 231 | 10% | 70.6% | 18.0 min | 1.3% |
| DL Delta Air Lines | 137 | 6% | 89.8% | -3.8 min | 0.7% |
| UA United Airlines | 137 | 6% | 83.9% | 5.8 min | 0.0% |
| AS Alaska Airlines | 102 | 5% | 88.2% | 1.5 min | 0.0% |
| HA Hawaiian Airlines | 30 | 1% | 90.0% | -7.3 min | 0.0% |
| MQ Envoy Air | 3 | 0% | 66.7% | 12.7 min | 0.0% |
| B6 JetBlue Airways | 1 | 0% | 100.0% | -2.0 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 289 | 87.5% | -0.4 min | 0.3% |
| ONT–DEN | Ontario to Denver | 252 | 76.6% | 9.4 min | 0.4% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 227 | 77.5% | 6.0 min | 2.2% |
| ONT–LAS | Ontario to Las Vegas | 223 | 77.1% | 18.0 min | 0.4% |
| ONT–SEA | Ontario to Seattle | 202 | 90.6% | -2.0 min | 0.0% |
| ONT–SMF | Ontario to Sacramento | 182 | 87.9% | -2.8 min | 0.0% |
| ONT–SFO | Ontario to San Francisco | 154 | 86.4% | -6.3 min | 0.6% |
| ONT–OAK | Ontario to Oakland | 130 | 90.8% | -2.9 min | 0.0% |
| ONT–SJC | Ontario to San Jose | 114 | 90.4% | -2.0 min | 0.0% |
| ONT–SLC | Ontario to Salt Lake City | 90 | 97.8% | -10.9 min | 0.0% |
| ONT–ATL | Ontario to Atlanta | 77 | 84.4% | 0.1 min | 1.3% |
| ONT–IAH | Ontario to Houston | 54 | 85.2% | 2.0 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in April 2025?
86.1% of 2,250 scheduled domestic departures left less than 15 minutes late, and 85.3% reached their destination on time. The national figures that month were 80.6% and 79.5%.
How does that compare with a year earlier?
In April 2024, 82.0% of 2,098 departures left on time and 0.5% were cancelled, against 86.1% and 0.4% in April 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for April 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.