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

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

76.6% of 337 official scheduled ONT-to-AUS flights arrived on time; 10.1% 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
76.6%arrived on time
10.1%30+ min late
0.3%cancelled
337scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.2%all scheduled flights
120+ minutes late1.2%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival+7.6 mincompleted flights

Which departure time was most reliable for ONT to AUS?

Among qualifying ONT-to-AUS departure window results, Early morning had the highest on-time rate: 80.8% of 52 flights. Afternoon was lowest at 67.6% across 68 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning5280.8%5.8%0.0%
Late morning21778.3%7.8%0.5%
Afternoon6867.6%20.6%0.0%

Which weekday was most reliable for ONT to AUS?

Among qualifying ONT-to-AUS weekday results, Tuesday had the highest on-time rate: 79.2% of 53 flights. Friday was lowest at 71.2% across 52 flights.

DayFlightsOn time30+ minCancelled
Monday5276.9%11.5%0.0%
Tuesday5379.2%9.4%0.0%
Wednesday5377.4%9.4%0.0%
Thursday5278.8%5.8%0.0%
Friday5271.2%9.6%1.9%
Sunday5273.1%17.3%0.0%

Which airline was most reliable for ONT to AUS?

Only Southwest Airlines met the ONT-to-AUS airline threshold: 76.8% of 336 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines33676.8%9.8%0.3%
SkyWest Airlines10.0%100.0%0.0%

Which month was most reliable for ONT to AUS?

Among qualifying ONT-to-AUS month results, September 2025 had the highest on-time rate: 92.3% of 26 flights. May 2026 was lowest at 53.8% across 26 flights.

MonthFlightsOn time30+ minCancelled
July 20253177.4%6.5%0.0%
August 20252680.8%7.7%0.0%
September 20252692.3%3.8%0.0%
October 20252788.9%0.0%0.0%
November 20252969.0%20.7%0.0%
December 20253174.2%9.7%3.2%
January 20262878.6%10.7%0.0%
February 20262479.2%4.2%0.0%
March 20263271.9%6.2%0.0%
April 20262785.2%3.7%0.0%
May 20262653.8%30.8%0.0%
June 20263070.0%16.7%0.0%

What drove ONT to AUS delay minutes?

National airspace was the largest recorded ONT-to-AUS delay category, accounting for 35.6% of 3,156 BTS-attributed delay minutes during July 2025–June 2026.

Airline31.3%
Late aircraft32.6%
National airspace35.6%
Weather0.0%
Security0.5%
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.