Best Time to Fly PHX to ONT: On-Time Stats by Hour & Airline
Phoenix Sky Harbor International → Ontario International
Data through July 2026 · Last updated October 18, 2026
3,027 flights were scheduled from Phoenix (PHX) to Ontario (ONT) in the last 12 months, and 77.2% of those that flew arrived on time, in line with the US average of 77.6%.
Among 4 airlines, SkyWest Airlines led with 95.0% on time and Southwest Airlines was last with 73.8%.
Over 24 months, Tuesday was the most reliable day (85% on time) and June the worst month (70%).
The cancellation rate was 0.5% (US average 1.8%).
PHX to ONT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlines | 95.0% | 67 min | 1.6% | 61 |
| Envoy Air | 91.1% | 37 min | 0.0% | 45 |
| American Airlines | 80.0% | 67 min | 0.8% | 1,311 |
| Southwest Airlines | 73.8% | 49 min | 0.2% | 1,610 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHX to ONT
On-time arrival % by scheduled departure hour (local time), 6,316 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 95.3% | 0.0% | 43 |
| 7am–8am | 94.0% | 0.0% | 371 |
| 8am–9am | 93.6% | 0.4% | 546 |
| 9am–10am | 90.4% | 0.3% | 325 |
| 10am–11am | 83.3% | 0.7% | 572 |
| 11am–12pm | 85.5% | 0.4% | 472 |
| 12pm–1pm | 81.6% | 0.0% | 190 |
| 1pm–2pm | 81.2% | 0.0% | 139 |
| 2pm–3pm | 79.9% | 0.2% | 438 |
| 3pm–4pm | 82.8% | 0.4% | 561 |
| 4pm–5pm | 81.7% | 0.4% | 275 |
| 5pm–6pm | 74.5% | 0.0% | 490 |
| 6pm–7pm | 71.4% | 0.7% | 430 |
| 7pm–8pm | 62.3% | 0.0% | 215 |
| 8pm–9pm | 71.5% | 0.7% | 614 |
| 9pm–10pm | 67.1% | 0.5% | 398 |
| 10pm–11pm | 61.4% | 0.4% | 229 |
| 11pm–12am | Limited data | 8 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PHX to ONT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 79.7% | -1.1 pts | 0.0% | 128 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.3% | -6.4 pts | 0.4% | 266 |
| Summer peak (Jun 15 - Aug 15) | 76.2% | -4.6 pts | 0.2% | 1,014 |
| All other days | 80.8% | — | 0.4% | 4,908 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).