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

Houston, TX (HOU) to Ontario, CA (ONT) flight delay odds

80.1% of 362 official scheduled HOU-to-ONT flights arrived on time; 10.8% 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 SIGNALLower disruption
80.1%arrived on time
10.8%30+ min late
0.3%cancelled
362scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.9%all scheduled flights
120+ minutes late2.8%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival+6.0 mincompleted flights

Which departure time was most reliable for HOU to ONT?

Among qualifying HOU-to-ONT departure window results, Early morning had the highest on-time rate: 89.1% of 110 flights. Night was lowest at 69.8% across 43 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning11089.1%5.5%0.0%
Afternoon12075.8%14.2%0.0%
Evening6675.8%13.6%0.0%
Night4369.8%16.3%2.3%

Which weekday was most reliable for HOU to ONT?

Among qualifying HOU-to-ONT weekday results, Thursday had the highest on-time rate: 90.2% of 51 flights. Saturday was lowest at 73.1% across 52 flights.

DayFlightsOn time30+ minCancelled
Monday5276.9%13.5%0.0%
Tuesday5383.0%7.5%1.9%
Wednesday5284.6%7.7%0.0%
Thursday5190.2%5.9%0.0%
Friday5178.4%13.7%0.0%
Saturday5273.1%13.5%0.0%
Sunday5174.5%13.7%0.0%

Which airline was most reliable for HOU to ONT?

Only Southwest Airlines met the HOU-to-ONT airline threshold: 80.1% of 362 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines36280.1%10.8%0.3%

Which month was most reliable for HOU to ONT?

Among qualifying HOU-to-ONT month results, July 2025 had the highest on-time rate: 96.8% of 31 flights. June 2026 was lowest at 56.7% across 30 flights.

MonthFlightsOn time30+ minCancelled
July 20253196.8%0.0%0.0%
August 20253083.3%6.7%0.0%
September 20253090.0%3.3%0.0%
October 20253073.3%13.3%0.0%
November 20252972.4%20.7%0.0%
December 20253180.6%6.5%0.0%
January 20263190.3%3.2%0.0%
February 20262885.7%10.7%0.0%
March 20263177.4%19.4%0.0%
April 20263080.0%3.3%0.0%
May 20263174.2%12.9%3.2%
June 20263056.7%30.0%0.0%

What drove HOU to ONT delay minutes?

Late aircraft was the largest recorded HOU-to-ONT delay category, accounting for 48.2% of 3,922 BTS-attributed delay minutes during July 2025–June 2026.

Airline38.3%
Late aircraft48.2%
National airspace9.7%
Weather0.6%
Security3.1%
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.