ONT to PHX flight delays & on-time performance
Nonstop flights from Ontario International Airport to Phoenix Sky Harbor International Airport · 325 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ONT or PHX right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Ontario (ONT) to Phoenix (PHX) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.6% were cancelled, and 5% arrived an hour or more late.
- American Airlines was the most punctual airline here (84% on time); Southwest Airlines was the least (81%).
- Departures scheduled around 5am did best (96% on time); around 4pm did worst (72%).
- Saturday was the most reliable day to fly (84% on time) and Friday the least (80%).
- The largest source of delay minutes was late-arriving aircraft (47%).
Which airline is most on time from ONT to PHX?
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 |
|---|---|---|---|---|---|
| Envoy AirRegional airline operating American Eagle flights. | 89% | 0.0% | 4 min | 0.0% | 45 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 88% | 1.6% | 6 min | 3.3% | 61 |
| American Airlines | 84% | 0.9% | 17 min | 6.6% | 1,311 |
| Southwest Airlines | 81% | 0.4% | 11 min | 4.1% | 1,610 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%296 flights
- 6am88%416 flights
- 7am81%37 flights
- 8am92%145 flights
- 9am91%246 flights
- 10am81%91 flights
- 11am87%55 flights
- 12pm83%362 flights
- 1pm83%209 flights
- 2pm84%63 flights
- 3pm73%184 flights
- 4pm72%289 flights
- 5pm77%159 flights
- 6pm67%81 flights
- 7pm77%293 flights
- 8pm60%87 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday81%1.1% cancelled
- Tuesday84%0.2% cancelled
- Wednesday84%0.5% cancelled
- Thursday83%0.2% cancelled
- Friday80%0.9% cancelled
- Saturday84%0.9% cancelled
- Sunday81%0.7% 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 aircraft47%
- Airline (crew, maintenance, cleaning, fueling)37%
- Air traffic control & airport congestion15%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion37%
- Airline (crew, maintenance, cleaning, fueling)32%
- Extreme weather32%
- Security0%
ONT to PHX: common questions
- How often are ONT to PHX flights on time?
- 82% 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 Ontario to Phoenix cancelled?
- 0.6% of scheduled flights were cancelled (19 of 3,027).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 71 min behind schedule on average, and 5.1% of flights were an hour or more late.
- How long is taxi time at ONT?
- Flights on this route spent 14 min taxiing from the gate to takeoff on average.
Related routes
Return trip: PHX to ONT — 77% on time
More flights from Ontario
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ONT → PHX, nonstop flights by US airlines that report to the DOT. How we calculate this.