PHX → ONT: 77% on-time

Historical on-time performance

Phoenix to Ontario

325 miData through May 2026Source: US DOT · BTS

Flights on PHX–ONT arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min

p90 delay40 min1 in 10 flights is worse (tail risk)

Cancelled0.4%of scheduled flights

based on 2,990 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Airline	On-time	Median	p90	Cancel	Flights
SkyWest Airlines⚠ low data	90%	on time	5 min	0.0%	61
American Airlinesbest	79%	on time	45 min	0.8%	1,321
Southwest Airlines	75%	on time	40 min	0.2%	1,608

SkyWest Airlines
On-time90%
Medianon time
p905 min
Cancel0.0%
Flights61
American Airlinesbest
On-time79%
Medianon time
p9045 min
Cancel0.8%
Flights1,321
Southwest Airlines
On-time75%
Medianon time
p9040 min
Cancel0.2%
Flights1,608

Why flights run late

Delay causes

Airline35%
Weather0%
Air traffic (NAS)4%
Late aircraft61%
Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

Airline23%
Weather31%
Air traffic (NAS)46%
Security0%

Most cancellations here are attributed to Air traffic (NAS). Shares are among 13 cancellations with a reported cause (BTS reports causes from June 2003).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly PHX → ONT

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

Mornings are the most reliable time of day to fly this route — 92% on time.

Mornings92% on time · p90 5 min · 2,086 flights
Middays85% on time · p90 25 min · 1,957 flights
Afternoons80% on time · p90 35 min · 1,796 flights
Evenings71% on time · p90 55 min · 1,665 flights
Overnights69% on time · p90 55 min · 1,960 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 76% to 84% on time.

Tuesdays84% on time · p90 25 min · 1,304 flights
Wednesdays84% on time · p90 25 min · 1,341 flights
Saturdays81% on time · p90 30 min · 1,127 flights
Mondays80% on time · p90 40 min · 1,443 flights
Thursdays79% on time · p90 35 min · 1,454 flights
Sundays77% on time · p90 40 min · 1,341 flights
Fridays76% on time · p90 45 min · 1,454 flights

Keep exploring

Delay predictorfor this route→PHX airportPhoenix→ONT airportOntario→Southwest Airlinesairline profile→American Airlinesairline profile→SkyWest Airlinesairline profile→Seasonal delay patternsguide→