Airports › Ontario (ONT) › May 2024
Airport month · May 2024
Ontario International in May 2024
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 May 2024, reporting carriers scheduled 2,259 domestic departures from Ontario International (ONT). 77.9% left less than 15 minutes late and 77.6% reached their destination on time; 1.1% were cancelled.
Nationally that month, 73.4% of flights departed on time and 72.3% arrived on time, so ONT departures were 4.5 points above the national departure figure.
Flights arriving at ONT that month were on time 71.2% of the time (2,260 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, air carrier 35% and national aviation system 20%.
- On time 77.6%
- Arrived 15+ minutes late 21.0%
- Cancelled 1.1%
- Diverted 0.3%
May 2024 against a year earlier, the airport's year and the nation
| Measure | May 2024 | Year earlier | ONT, 12 months to Jul 2026 | All reported flights, May 2024 |
|---|---|---|---|---|
| Departed on time | 77.9% | — | 80.3% | 73.4% |
| Arrived on time | 77.6% | — | 81.2% | 72.3% |
| Cancelled | 1.1% | — | 0.9% | 1.4% |
| Average departure delay (late minutes only) | 16.2 min | — | 13.7 min | 20.8 min |
| Scheduled departures a day | 75 | — | 71 | 20,325 |
| Scheduled departures | 2,259 | — | 25,854 | 609,743 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 924 | 41% | 79.0% | 3.6 min | 0.6% |
| F9 Frontier Airlines | 340 | 15% | 67.9% | 11.9 min | 1.2% |
| AA American Airlines | 313 | 14% | 70.3% | 31.9 min | 4.5% |
| OO SkyWest Airlines | 255 | 11% | 85.1% | 0.6 min | 0.0% |
| DL Delta Air Lines | 141 | 6% | 89.4% | -0.3 min | 0.0% |
| UA United Airlines | 114 | 5% | 85.1% | 0.5 min | 0.0% |
| AS Alaska Airlines | 110 | 5% | 76.4% | 7.7 min | 0.9% |
| B6 JetBlue Airways | 31 | 1% | 87.1% | -7.5 min | 0.0% |
| HA Hawaiian Airlines | 31 | 1% | 67.7% | 21.8 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 297 | 75.8% | 9.4 min | 1.0% |
| ONT–SEA | Ontario to Seattle | 254 | 85.8% | 1.3 min | 0.4% |
| ONT–DEN | Ontario to Denver | 247 | 83.8% | 0.4 min | 0.4% |
| ONT–LAS | Ontario to Las Vegas | 240 | 73.8% | 9.3 min | 0.4% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 218 | 61.9% | 41.3 min | 5.0% |
| ONT–SMF | Ontario to Sacramento | 153 | 86.9% | 0.0 min | 0.0% |
| ONT–OAK | Ontario to Oakland | 131 | 74.8% | 5.6 min | 1.5% |
| ONT–SLC | Ontario to Salt Lake City | 118 | 85.6% | -1.5 min | 0.0% |
| ONT–SJC | Ontario to San Jose | 108 | 77.8% | 5.1 min | 0.0% |
| ONT–SFO | Ontario to San Francisco | 92 | 47.8% | 22.0 min | 0.0% |
| ONT–PDX | Ontario to Portland | 84 | 85.7% | -2.1 min | 1.2% |
| ONT–ATL | Ontario to Atlanta | 79 | 83.5% | 7.1 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in May 2024?
77.9% of 2,259 scheduled domestic departures left less than 15 minutes late, and 77.6% reached their destination on time. The national figures that month were 73.4% and 72.3%.
How does that compare with a year earlier?
May 2023 is outside the 36 months on file, or the airport had too few reported flights that month.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2024; 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.