PHX to ONT flight delays & on-time performance
Nonstop flights from Phoenix Sky Harbor International Airport to Ontario International Airport · 325 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at PHX or ONT right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Phoenix (PHX) to Ontario (ONT) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.5% were cancelled, and 7% arrived an hour or more late.
- American Airlines was the most punctual airline here (80% on time); Southwest Airlines was the least (74%).
- Departures scheduled around 7am did best (95% on time); around 7pm did worst (56%).
- Tuesday was the most reliable day to fly (83% on time) and Friday the least (73%).
- The largest source of delay minutes was late-arriving aircraft (60%).
Which airline is most on time from PHX to ONT?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 95% | 1.6% | 4 min | 3.3% | 61 |
| Envoy AirRegional airline operating American Eagle flights. | 91% | 0.0% | 4 min | 0.0% | 45 |
| American Airlines | 80% | 0.8% | 14 min | 7.3% | 1,311 |
| Southwest Airlines | 74% | 0.2% | 14 min | 6.7% | 1,610 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am95%131 flights
- 8am91%300 flights
- 9am93%127 flights
- 10am84%324 flights
- 11am82%219 flights
- 12pm75%97 flights
- 1pm72%78 flights
- 2pm82%135 flights
- 3pm81%324 flights
- 4pm81%140 flights
- 5pm73%220 flights
- 6pm68%178 flights
- 7pm56%134 flights
- 8pm64%289 flights
- 9pm63%221 flights
- 10pm65%103 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday77%0.4% cancelled
- Tuesday83%0.5% cancelled
- Wednesday78%0.2% cancelled
- Thursday78%0.0% cancelled
- Friday73%0.9% cancelled
- Saturday77%0.6% cancelled
- Sunday74%0.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft60%
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion5%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion40%
- Extreme weather33%
- Airline (crew, maintenance, cleaning, fueling)27%
- Security0%
PHX to ONT: common questions
- How often are PHX to ONT flights on time?
- 77% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Phoenix to Ontario cancelled?
- 0.5% of scheduled flights were cancelled (15 of 3,027).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 56 min behind schedule on average, and 6.8% of flights were an hour or more late.
- How long is taxi time at PHX?
- Flights on this route spent 14 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ONT to PHX — 82% on time
More flights from Phoenix
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: PHX → ONT, nonstop flights by US airlines that report to the DOT. How we calculate this.