ONT → PHX: 82% on-time

Historical on-time performance

Ontario to Phoenix

325 miData through May 2026Source: US DOT · BTS

Flights on ONT–PHX arrive on time 82% of the time over the last 12 months.

On-time rate82%arrived within 15 min

p90 delay30 min1 in 10 flights is worse (tail risk)

Cancelled0.5%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

Too close to call — no single carrier is clearly more on-time here.

Airline	On-time	Median	p90	Cancel	Flights
SkyWest Airlines⚠ low data	84%	on time	25 min	0.0%	61
Southwest Airlines	82%	on time	30 min	0.4%	1,608
American Airlines	82%	on time	35 min	0.8%	1,321

SkyWest Airlines
On-time84%
Medianon time
p9025 min
Cancel0.0%
Flights61
Southwest Airlines
On-time82%
Medianon time
p9030 min
Cancel0.4%
Flights1,608
American Airlines
On-time82%
Medianon time
p9035 min
Cancel0.8%
Flights1,321

Why flights run late

Delay causes

Airline37%
Weather1%
Air traffic (NAS)16%
Late aircraft46%
Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

Airline25%
Weather31%
Air traffic (NAS)44%
Security0%

Most cancellations here are attributed to Air traffic (NAS). Shares are among 16 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 ONT → PHX

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 · 3,293 flights
Middays87% on time · p90 20 min · 2,268 flights
Afternoons79% on time · p90 35 min · 1,670 flights
Evenings76% on time · p90 45 min · 1,744 flights
Overnights76% on time · p90 45 min · 495 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 82% to 89% on time.

Saturdays89% on time · p90 15 min · 1,141 flights
Tuesdays88% on time · p90 20 min · 1,315 flights
Wednesdays87% on time · p90 20 min · 1,338 flights
Thursdays83% on time · p90 30 min · 1,452 flights
Mondays83% on time · p90 30 min · 1,432 flights
Sundays83% on time · p90 25 min · 1,337 flights
Fridays82% on time · p90 30 min · 1,455 flights

Keep exploring

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