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

Portland, OR (PDX) to Ontario, CA (ONT) flight delay odds

83.5% of 552 official scheduled PDX-to-ONT flights arrived on time; 8.7% arrived at least 30 minutes late and 0.4% 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
83.5%arrived on time
8.7%30+ min late
0.4%cancelled
552scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.9%all scheduled flights
120+ minutes late1.3%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+1.5 mincompleted flights

Which departure time was most reliable for PDX to ONT?

Among qualifying PDX-to-ONT departure window results, Early morning had the highest on-time rate: 92.0% of 50 flights. Night was lowest at 81.1% across 164 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning5092.0%6.0%0.0%
Afternoon19381.9%8.8%0.5%
Evening11786.3%8.5%0.0%
Night16481.1%8.5%0.6%

Which weekday was most reliable for PDX to ONT?

Among qualifying PDX-to-ONT weekday results, Sunday had the highest on-time rate: 88.8% of 98 flights. Friday was lowest at 77.9% across 95 flights.

DayFlightsOn time30+ minCancelled
Monday9887.8%5.1%0.0%
Tuesday6185.2%4.9%1.6%
Wednesday6279.0%11.3%0.0%
Thursday8281.7%11.0%1.2%
Friday9577.9%11.6%0.0%
Saturday5682.1%12.5%0.0%
Sunday9888.8%6.1%0.0%

Which airline was most reliable for PDX to ONT?

Among qualifying PDX-to-ONT airline results, Alaska Airlines had the highest on-time rate: 84.2% of 404 flights. Frontier Airlines was lowest at 81.4% across 86 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines40484.2%7.7%0.5%
Frontier Airlines8681.4%12.8%0.0%
SkyWest Airlines6282.3%9.7%0.0%

Which month was most reliable for PDX to ONT?

Among qualifying PDX-to-ONT month results, October 2025 had the highest on-time rate: 88.6% of 44 flights. December 2025 was lowest at 68.9% across 45 flights.

MonthFlightsOn time30+ minCancelled
July 20252688.5%3.8%0.0%
August 20254075.0%15.0%0.0%
September 20256085.0%10.0%0.0%
October 20254488.6%9.1%2.3%
November 20256785.1%4.5%1.5%
December 20254568.9%17.8%0.0%
January 20266182.0%13.1%0.0%
February 20264684.8%4.3%0.0%
March 20263982.1%0.0%0.0%
April 20263588.6%8.6%0.0%
May 20263786.5%5.4%0.0%
June 20265288.5%9.6%0.0%

What drove PDX to ONT delay minutes?

Airline was the largest recorded PDX-to-ONT delay category, accounting for 53.3% of 4,765 BTS-attributed delay minutes during July 2025–June 2026.

Airline53.3%
Late aircraft35.3%
National airspace10.5%
Weather0.4%
Security0.4%
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.