ONT to PHX flight delays
Ontario, CA (ONT) Phoenix, AZ (PHX) · 325 miles
3,059 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
82.72%
Arrived on time
Within 15 minutes of schedule
0.65%
Cancelled
Share of scheduled flights
70 min
When late, late by
Average across delayed arrivals
13 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The two directions do not behave alike. PHX to ONT arrives on time 5 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
The 2 airlines here are separated by under 3 points — close enough to call a tie. Choose on price and departure time.
Flights from Ontario to Phoenix keep to schedule more reliably than most. On a route this punctual the day you fly matters more than the airline you pick.
Which airline should you fly on this route?
Over January 2025 – August 2026, American Airlines arrived on time most often on ONT to PHX. Southwest Airlines was late most often. Flights ran closest to schedule in May and worst in November.
Every airline on ONT to PHX
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 1,608 | 81.52% | 0.37% | 49 min | B |
| American Airlines | 1,315 | 83.79% | 0.99% | 101 min | B |
| SkyWest Airlines | 91 | 85.56% | 1.1% | 59 min | — |
| Envoy Air | 45 | 88.89% | 0% | 29 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
PHX to ONT Phoenix back to Ontario 77.72% on time COther routes from Ontario
Common questions
Are flights from Ontario to Phoenix usually delayed?
82.72% of flights on the ONT to PHX route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
Which airline is most on time from Ontario to Phoenix?
American Airlines, at 83.79% on time across 1,315 flights. The least punctual on the route was Southwest Airlines at 81.52%.
How often are ONT to PHX flights cancelled?
0.65% of scheduled flights did not operate — about 7 in every thousand. That is in the normal range.
What is the best month to fly Ontario to Phoenix?
May, when 87.8% of flights arrived on time. The worst was November at 73.6%.
When ONT to PHX flights are late, how late are they?
About 70 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on ONT to PHX during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →