BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
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DAL→ONT

Dallas, TX (DAL) to Ontario, CA (ONT) flight delay odds

64.5% of 403 official scheduled DAL-to-ONT flights arrived on time; 19.9% arrived at least 30 minutes late and 1.5% 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 SIGNALVariable
64.5%arrived on time
19.9%30+ min late
1.5%cancelled
403scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.4%all scheduled flights
120+ minutes late2.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+15.5 mincompleted flights

Which departure time was most reliable for DAL to ONT?

Among qualifying DAL-to-ONT departure window results, Evening had the highest on-time rate: 61.8% of 233 flights. Afternoon was lowest at 61.8% across 102 flights.

Departure windowFlightsOn time30+ minCancelled
Afternoon10261.8%20.6%2.9%
Evening23361.8%23.2%1.3%

Which weekday was most reliable for DAL to ONT?

Among qualifying DAL-to-ONT weekday results, Wednesday had the highest on-time rate: 71.7% of 53 flights. Sunday was lowest at 54.7% across 75 flights.

DayFlightsOn time30+ minCancelled
Monday5560.0%30.9%0.0%
Tuesday5666.1%8.9%3.6%
Wednesday5371.7%11.3%0.0%
Thursday5271.2%17.3%1.9%
Friday5561.8%29.1%0.0%
Saturday5770.2%22.8%3.5%
Sunday7554.7%18.7%1.3%

Which airline was most reliable for DAL to ONT?

Only Southwest Airlines met the DAL-to-ONT airline threshold: 64.5% of 403 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines40364.5%19.9%1.5%

Which month was most reliable for DAL to ONT?

Among qualifying DAL-to-ONT month results, March 2026 had the highest on-time rate: 77.4% of 31 flights. June 2026 was lowest at 46.7% across 30 flights.

MonthFlightsOn time30+ minCancelled
July 20253551.4%17.1%2.9%
August 20253571.4%14.3%0.0%
September 20253473.5%20.6%0.0%
October 20253154.8%35.5%0.0%
November 20253571.4%20.0%2.9%
December 20254276.2%7.1%0.0%
January 20263476.5%8.8%5.9%
February 20262860.7%21.4%3.6%
March 20263177.4%9.7%0.0%
April 20263354.5%21.2%0.0%
May 20263554.3%28.6%2.9%
June 20263046.7%40.0%0.0%

What drove DAL to ONT delay minutes?

Late aircraft was the largest recorded DAL-to-ONT delay category, accounting for 60.7% of 7,119 BTS-attributed delay minutes during July 2025–June 2026.

Airline30.4%
Late aircraft60.7%
National airspace5.6%
Weather3.3%
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.