BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
ONT→PHX

Ontario, CA (ONT) to Phoenix, AZ (PHX) flight delay odds

82.2% of 3,059 official scheduled ONT-to-PHX flights arrived on time; 10.9% arrived at least 30 minutes late and 0.7% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
82.2%arrived on time
10.9%30+ min late
0.7%cancelled
3,059scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.0%all scheduled flights
120+ minutes late1.7%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+5.2 mincompleted flights

Which departure time was most reliable for ONT to PHX?

Among qualifying ONT-to-PHX departure window results, Early morning had the highest on-time rate: 89.7% of 880 flights. Evening was lowest at 74.0% across 627 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning88089.7%5.7%0.8%
Late morning41187.8%8.0%0.7%
Afternoon1,12679.0%12.3%0.8%
Evening62774.0%17.1%0.2%

Which weekday was most reliable for ONT to PHX?

Among qualifying ONT-to-PHX weekday results, Tuesday had the highest on-time rate: 83.9% of 446 flights. Sunday was lowest at 80.1% across 447 flights.

DayFlightsOn time30+ minCancelled
Monday45980.6%11.5%1.3%
Tuesday44683.9%9.6%0.2%
Wednesday42882.9%11.2%0.7%
Thursday46683.3%11.2%0.2%
Friday46181.6%10.2%0.9%
Saturday35283.2%10.5%0.6%
Sunday44780.1%11.6%0.7%

Which airline was most reliable for ONT to PHX?

Among qualifying ONT-to-PHX airline results, Envoy Air had the highest on-time rate: 88.9% of 45 flights. Southwest Airlines was lowest at 81.2% across 1,608 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,60881.2%10.8%0.4%
American Airlines1,31583.0%11.2%1.0%
SkyWest Airlines9184.6%9.9%1.1%
Envoy Air4588.9%4.4%0.0%

Which month was most reliable for ONT to PHX?

Among qualifying ONT-to-PHX month results, May 2026 had the highest on-time rate: 87.8% of 254 flights. November 2025 was lowest at 71.7% across 272 flights.

MonthFlightsOn time30+ minCancelled
July 202526381.4%12.9%0.8%
August 202523784.0%11.8%0.0%
September 202522783.7%10.1%2.2%
October 202525876.7%12.0%0.0%
November 202527271.7%17.6%2.6%
December 202528280.1%10.3%0.0%
January 202626184.7%10.0%0.8%
February 202624087.5%7.5%0.0%
March 202628985.1%10.0%0.3%
April 202625286.9%7.9%0.0%
May 202625487.8%6.7%0.0%
June 202622477.2%12.9%1.3%

What drove ONT to PHX delay minutes?

Late aircraft was the largest recorded ONT-to-PHX delay category, accounting for 45.7% of 36,743 BTS-attributed delay minutes during July 2025–June 2026.

Airline37.9%
Late aircraft45.7%
National airspace15.4%
Weather0.7%
Security0.2%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.