Best Time to Fly ONT to PHX: On-Time Stats by Hour & Airline
Ontario International → Phoenix Sky Harbor International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 82.5% of Ontario (ONT) to Phoenix (PHX) flights arrived on time (3,027 scheduled flights). That is 4.9 points above the national average of 77.6%.
Envoy Air was the most punctual of the 4 airlines on the route at 88.9%, while Southwest Airlines trailed at 80.9%.
February has been the best month (90% on time) and Sunday the weakest day of the week (83%).
0.6% of flights were cancelled, versus 1.8% nationally.
ONT to PHX 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 |
|---|---|---|---|---|
| Envoy Air | 88.9% | 29 min | 0.0% | 45 |
| SkyWest Airlines | 88.3% | 48 min | 1.6% | 61 |
| American Airlines | 83.9% | 105 min | 0.9% | 1,311 |
| Southwest Airlines | 80.9% | 50 min | 0.4% | 1,610 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ONT to PHX
On-time arrival % by scheduled departure hour (local time), 6,317 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.7% | 0.5% | 583 |
| 6am–7am | 90.0% | 0.6% | 847 |
| 7am–8am | 81.6% | 0.0% | 38 |
| 8am–9am | 90.8% | 0.5% | 218 |
| 9am–10am | 93.9% | 0.8% | 527 |
| 10am–11am | 88.7% | 0.6% | 355 |
| 11am–12pm | 92.0% | 0.0% | 137 |
| 12pm–1pm | 85.5% | 0.7% | 765 |
| 1pm–2pm | 85.5% | 1.5% | 273 |
| 2pm–3pm | 83.7% | 0.0% | 227 |
| 3pm–4pm | 77.1% | 0.0% | 249 |
| 4pm–5pm | 77.9% | 0.3% | 745 |
| 5pm–6pm | 79.3% | 0.0% | 299 |
| 6pm–7pm | 77.2% | 0.0% | 145 |
| 7pm–8pm | 77.8% | 0.1% | 693 |
| 8pm–9pm | 67.8% | 0.7% | 147 |
| 9pm–10pm | 84.6% | 0.0% | 52 |
| 10pm–11pm | Limited data | 15 | |
| 11pm–12am | Limited data | 2 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ONT to PHX
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) | 86.6% | +0.5 pts | 0.0% | 127 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.3% | -3.7 pts | 0.0% | 266 |
| Summer peak (Jun 15 - Aug 15) | 82.1% | -3.9 pts | 0.6% | 1,014 |
| All other days | 86.1% | — | 0.5% | 4,910 |
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).