Airports › Ontario (ONT) › March 2026
Airport month · March 2026
Ontario International in March 2026
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 2026, reporting carriers scheduled 2,081 domestic departures from Ontario International (ONT). 83.7% left less than 15 minutes late and 81.7% reached their destination on time; 1.0% were cancelled.
Nationally that month, 72.8% of flights departed on time and 73.2% arrived on time, so ONT departures were 10.9 points above the national departure figure.
A year earlier, in March 2025, the airport had 2,107 departures with 84.9% leaving on time: a change of −1.2 points, with flights down 1%.
Flights arriving at ONT that month were on time 81.5% of the time (2,082 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, air carrier 28% and national aviation system 23%.
- On time 81.7%
- Arrived 15+ minutes late 17.0%
- Cancelled 1.0%
- Diverted 0.3%
March 2026 against a year earlier, the airport's year and the nation
| Measure | Mar 2026 | Mar 2025 | ONT, 12 months to Jul 2026 | All reported flights, Mar 2026 |
|---|---|---|---|---|
| Departed on time | 83.7% | 84.9% | 80.3% | 72.8% |
| Arrived on time | 81.7% | 84.9% | 81.2% | 73.2% |
| Cancelled | 1.0% | 0.6% | 0.9% | 2.9% |
| Average departure delay (late minutes only) | 10.2 min | 9.0 min | 13.7 min | 20.3 min |
| Scheduled departures a day | 69 | 70 | 71 | 20,403 |
| Scheduled departures | 2,081 | 2,107 | 25,854 | 612,102 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 984 | 47% | 81.6% | 1.2 min | 0.2% |
| AA American Airlines | 335 | 16% | 84.5% | -0.2 min | 0.9% |
| UA United Airlines | 214 | 10% | 82.7% | 1.1 min | 2.3% |
| AS Alaska Airlines | 160 | 8% | 80.0% | 2.4 min | 1.3% |
| F9 Frontier Airlines | 131 | 6% | 69.5% | 12.9 min | 1.5% |
| DL Delta Air Lines | 130 | 6% | 81.5% | -2.1 min | 4.6% |
| OO SkyWest Airlines | 127 | 6% | 88.2% | 1.3 min | 0.8% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ONT–PHX | Ontario to Phoenix | 289 | 85.1% | 0.7 min | 0.3% |
| ONT–DEN | Ontario to Denver | 200 | 71.5% | 8.0 min | 1.5% |
| ONT–LAS | Ontario to Las Vegas | 197 | 79.2% | 5.0 min | 0.0% |
| ONT–DFW | Ontario to Dallas/Fort Worth | 184 | 79.9% | 2.6 min | 1.1% |
| ONT–SMF | Ontario to Sacramento | 183 | 88.0% | -4.5 min | 0.0% |
| ONT–SEA | Ontario to Seattle | 177 | 85.9% | -0.5 min | 1.7% |
| ONT–OAK | Ontario to Oakland | 121 | 96.7% | -13.3 min | 0.0% |
| ONT–SJC | Ontario to San Jose | 107 | 83.2% | 0.4 min | 0.0% |
| ONT–SFO | Ontario to San Francisco | 103 | 89.3% | -10.6 min | 1.9% |
| ONT–SLC | Ontario to Salt Lake City | 94 | 84.0% | -2.9 min | 4.3% |
| ONT–ATL | Ontario to Atlanta | 62 | 79.0% | 1.2 min | 3.2% |
| ONT–IAH | Ontario to Houston | 40 | 75.0% | 13.3 min | 5.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left ONT on time in March 2026?
83.7% of 2,081 scheduled domestic departures left less than 15 minutes late, and 81.7% reached their destination on time. The national figures that month were 72.8% and 73.2%.
How does that compare with a year earlier?
In March 2025, 84.9% of 2,107 departures left on time and 0.6% were cancelled, against 83.7% and 1.0% in March 2026.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for March 2026; 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.