Ontario (ONT) to Phoenix (PHX): On-Time Performance
Data through May 2026
When you fly ONT to PHX matters as much as anything else about the booking: the route swung from 93% on-time in February 2025 to just 74% in November 2025. Across the full period the route averages 85% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 77%), which matters most in the rough months.
- On-time
- 85%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 8.5
- last 12 months
- Duration
- 1h 18m
- scheduled
- Distance
- 325 mi
Best airline from ONT to PHX
5 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 92% | 5 min | 0.0% | 216 |
| SkyWest Airlines | 86% | 13 min | 0.2% | 504 |
| Southwest Airlines | 85% | 8 min | 0.3% | 3,241 |
| American Airlines | 85% | 14 min | 0.5% | 2,392 |
| Frontier Airlines | 67% | 44 min | 9.5% | 74 |
Monthly on-time trend
Best time to fly from ONT to PHX
Aim for departures around 5 a.m. (97% on-time); avoid 10 p.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 14 min |
| Tuesdaybest | 88% | 9 min |
| Wednesday | 86% | 10 min |
| Thursday | 85% | 10 min |
| Friday | 84% | 11 min |
| Saturday | 87% | 9 min |
| Sunday | 83% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft52%
- Airline operations33%
- National airspace system13%
- Weather2%
Frequently asked questions
- How often are flights from ONT to PHX delayed?
- 15% of ONT–PHX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 11 minutes.
- Which airline is most reliable from ONT to PHX?
- Envoy Air has the best on-time record on this route at 92%, based on 216 flights. 5 airlines flew ONT–PHX frequently enough to compare in this period.
- What is the best time of day to fly from ONT to PHX?
- Departures around 5 a.m. have the best record (97% on-time), while departures around 10 p.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ONT to PHX?
- The scheduled ONT–PHX flight time averages 1h 18m over 325 miles. Actual arrival times vary — flights on this route land 15+ minutes late 15% of the time.
- How often are ONT to PHX flights cancelled?
- 0.5% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from ONT to PHX?
- November 2025 was the roughest month in this dataset, with only 74% of arrivals on time. The best was February 2025 at 93%. If your dates are flexible, that 20-point gap is worth planning around.
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Based on 6,427 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.