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

Austin, TX (AUS) to Ontario, CA (ONT) flight delay odds

76.7% of 335 official scheduled AUS-to-ONT flights arrived on time; 13.1% arrived at least 30 minutes late and 0.3% 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 SIGNALGenerally reliable
76.7%arrived on time
13.1%30+ min late
0.3%cancelled
335scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.7%all scheduled flights
120+ minutes late1.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+7.3 mincompleted flights

Which departure time was most reliable for AUS to ONT?

Among qualifying AUS-to-ONT departure window results, Afternoon had the highest on-time rate: 77.3% of 264 flights. Evening was lowest at 70.0% across 50 flights.

Departure windowFlightsOn time30+ minCancelled
Afternoon26477.3%12.9%0.4%
Evening5070.0%18.0%0.0%

Which weekday was most reliable for AUS to ONT?

Among qualifying AUS-to-ONT weekday results, Tuesday had the highest on-time rate: 92.5% of 53 flights. Sunday was lowest at 56.9% across 51 flights.

DayFlightsOn time30+ minCancelled
Monday5282.7%11.5%1.9%
Tuesday5392.5%3.8%0.0%
Wednesday5280.8%7.7%0.0%
Thursday5276.9%13.5%0.0%
Friday5269.2%15.4%0.0%
Sunday5156.9%29.4%0.0%

Which airline was most reliable for AUS to ONT?

Only Southwest Airlines met the AUS-to-ONT airline threshold: 76.7% of 335 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines33576.7%13.1%0.3%

Which month was most reliable for AUS to ONT?

Among qualifying AUS-to-ONT month results, March 2026 had the highest on-time rate: 90.3% of 31 flights. June 2026 was lowest at 63.3% across 30 flights.

MonthFlightsOn time30+ minCancelled
July 20253183.9%12.9%0.0%
August 20252673.1%7.7%0.0%
September 20252669.2%11.5%0.0%
October 20252774.1%7.4%0.0%
November 20252969.0%31.0%0.0%
December 20253180.6%9.7%0.0%
January 20262788.9%3.7%3.7%
February 20262479.2%12.5%0.0%
March 20263190.3%3.2%0.0%
April 20262774.1%11.1%0.0%
May 20262673.1%19.2%0.0%
June 20263063.3%26.7%0.0%

What drove AUS to ONT delay minutes?

Late aircraft was the largest recorded AUS-to-ONT delay category, accounting for 60.6% of 3,808 BTS-attributed delay minutes during July 2025–June 2026.

Airline27.4%
Late aircraft60.6%
National airspace11.3%
Weather0.7%
Security0.0%
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.