Airports › Ontario (ONT) › October 2025
Airport month · October 2025
Ontario International in October 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 October 2025, reporting carriers scheduled 2,265 domestic departures from Ontario International (ONT). 80.6% left less than 15 minutes late and 81.1% reached their destination on time; 0.5% were cancelled.
Nationally that month, 80.0% of flights departed on time and 79.1% arrived on time, so ONT departures were 0.6 points above the national departure figure.
A year earlier, in October 2024, the airport had 2,388 departures with 88.2% leaving on time: a change of −7.6 points, with flights down 5%.
Flights arriving at ONT that month were on time 76.0% of the time (2,267 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 35% and national aviation system 22%.
- On time 81.1%
- Arrived 15+ minutes late 18.3%
- Cancelled 0.5%
- Diverted 0.1%
October 2025 against a year earlier, the airport's year and the nation
| Measure | Oct 2025 | Oct 2024 | ONT, 12 months to Jul 2026 | All reported flights, Oct 2025 |
|---|---|---|---|---|
| Departed on time | 80.6% | 88.2% | 80.3% | 80.0% |
| Arrived on time | 81.1% | 88.3% | 81.2% | 79.1% |
| Cancelled | 0.5% | 0.3% | 0.9% | 0.5% |
| Average departure delay (late minutes only) | 13.2 min | 8.5 min | 13.7 min | 13.9 min |
| Scheduled departures a day | 76 | 80 | 71 | 20,195 |
| Scheduled departures | 2,265 | 2,388 | 25,854 | 605,844 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 1,003 | 44% | 80.1% | 4.1 min | 0.2% |
| AA American Airlines | 337 | 15% | 79.8% | 11.3 min | 0.6% |
| UA United Airlines | 238 | 11% | 76.1% | 6.9 min | 0.4% |
| F9 Frontier Airlines | 208 | 9% | 77.9% | 7.6 min | 1.0% |
| OO SkyWest Airlines | 155 | 7% | 94.8% | -8.8 min | 0.0% |
| DL Delta Air Lines | 152 | 7% | 88.8% | -0.1 min | 0.0% |
| AS Alaska Airlines | 147 | 6% | 81.0% | 3.7 min | 2.7% |
| B6 JetBlue Airways | 25 | 1% | 80.0% | 0.2 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 258 | 76.7% | 10.8 min | 0.0% |
| ONT–DEN | Ontario to Denver | 241 | 85.5% | 4.2 min | 0.8% |
| ONT–LAS | Ontario to Las Vegas | 228 | 78.9% | 3.5 min | 0.4% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 207 | 78.3% | 8.8 min | 1.4% |
| ONT–SEA | Ontario to Seattle | 200 | 84.0% | -0.7 min | 1.0% |
| ONT–SMF | Ontario to Sacramento | 181 | 81.8% | 1.4 min | 0.0% |
| ONT–OAK | Ontario to Oakland | 136 | 81.6% | 4.0 min | 0.0% |
| ONT–SLC | Ontario to Salt Lake City | 115 | 93.9% | -9.1 min | 0.0% |
| ONT–SFO | Ontario to San Francisco | 114 | 57.9% | 21.4 min | 0.0% |
| ONT–SJC | Ontario to San Jose | 110 | 78.2% | 4.6 min | 0.0% |
| ONT–ATL | Ontario to Atlanta | 85 | 88.2% | 3.1 min | 0.0% |
| ONT–IAH | Ontario to Houston | 48 | 89.6% | 5.5 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in October 2025?
80.6% of 2,265 scheduled domestic departures left less than 15 minutes late, and 81.1% reached their destination on time. The national figures that month were 80.0% and 79.1%.
How does that compare with a year earlier?
In October 2024, 88.2% of 2,388 departures left on time and 0.3% were cancelled, against 80.6% and 0.5% in October 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for October 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.