Airports › Ontario (ONT) › June 2025
Airport month · June 2025
Ontario International in June 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 June 2025, reporting carriers scheduled 2,307 domestic departures from Ontario International (ONT). 77.3% left less than 15 minutes late and 78.2% reached their destination on time; 0.9% were cancelled.
Nationally that month, 71.4% of flights departed on time and 70.3% arrived on time, so ONT departures were 5.9 points above the national departure figure.
A year earlier, in June 2024, the airport had 2,304 departures with 80.0% leaving on time: a change of −2.7 points, with flights up 0%.
Flights arriving at ONT that month were on time 68.8% of the time (2,309 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 55%, air carrier 22% and national aviation system 20%.
- On time 78.2%
- Arrived 15+ minutes late 20.4%
- Cancelled 0.9%
- Diverted 0.4%
June 2025 against a year earlier, the airport's year and the nation
| Measure | Jun 2025 | Jun 2024 | ONT, 12 months to Jul 2026 | All reported flights, Jun 2025 |
|---|---|---|---|---|
| Departed on time | 77.3% | 80.0% | 80.3% | 71.4% |
| Arrived on time | 78.2% | 80.6% | 81.2% | 70.3% |
| Cancelled | 0.9% | 1.2% | 0.9% | 1.6% |
| Average departure delay (late minutes only) | 16.3 min | 14.9 min | 13.7 min | 22.1 min |
| Scheduled departures a day | 77 | 77 | 71 | 20,386 |
| Scheduled departures | 2,307 | 2,304 | 25,854 | 611,575 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 1,016 | 44% | 79.2% | 7.1 min | 0.3% |
| AA American Airlines | 317 | 14% | 69.7% | 24.3 min | 1.9% |
| UA United Airlines | 239 | 10% | 76.6% | 9.4 min | 1.3% |
| F9 Frontier Airlines | 209 | 9% | 67.9% | 20.5 min | 2.4% |
| OO SkyWest Airlines | 176 | 8% | 91.5% | -5.6 min | 0.0% |
| DL Delta Air Lines | 171 | 7% | 88.3% | -3.6 min | 1.8% |
| AS Alaska Airlines | 135 | 6% | 79.3% | 7.0 min | 0.7% |
| B6 JetBlue Airways | 30 | 1% | 80.0% | -3.3 min | 0.0% |
| HA Hawaiian Airlines | 12 | 1% | 83.3% | -1.9 min | 0.0% |
| MQ Envoy Air | 2 | 0% | 50.0% | 90.5 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–SEA | Ontario to Seattle | 266 | 85.0% | 0.9 min | 0.4% |
| ONT–DEN | Ontario to Denver | 260 | 64.6% | 21.6 min | 1.2% |
| ONT–PHX | Ontario to Phoenix | 260 | 80.8% | 7.7 min | 0.0% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 218 | 67.4% | 19.4 min | 3.7% |
| ONT–LAS | Ontario to Las Vegas | 211 | 71.6% | 16.1 min | 0.9% |
| ONT–SMF | Ontario to Sacramento | 176 | 82.4% | 5.1 min | 0.6% |
| ONT–OAK | Ontario to Oakland | 135 | 83.0% | 3.3 min | 0.0% |
| ONT–SJC | Ontario to San Jose | 115 | 84.3% | 5.9 min | 0.0% |
| ONT–SLC | Ontario to Salt Lake City | 114 | 93.0% | -6.9 min | 0.9% |
| ONT–SFO | Ontario to San Francisco | 104 | 82.7% | 0.7 min | 1.0% |
| ONT–ATL | Ontario to Atlanta | 84 | 84.5% | -2.1 min | 2.4% |
| ONT–IAH | Ontario to Houston | 39 | 71.8% | 40.6 min | 2.6% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in June 2025?
77.3% of 2,307 scheduled domestic departures left less than 15 minutes late, and 78.2% reached their destination on time. The national figures that month were 71.4% and 70.3%.
How does that compare with a year earlier?
In June 2024, 80.0% of 2,304 departures left on time and 1.2% were cancelled, against 77.3% and 0.9% in June 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for June 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.