FlightRecord

Ontario (ONT) to Dallas (DAL): On-Time Performance

Data through July 2026

The calendar drives reliability on ONT–DAL. July 2025 flights landed on schedule 97% of the time, but May 2025 dropped to 50% — a gap of 47 points. Across the full period the route averages 79% on-time against a national 78%.

On-time
79%
arrived <15 min late
Avg delay
11 min
completed flights
Cancelled
1.0%
Flights/day
1.1
last 12 months
Duration
2h 52m
scheduled
Distance
1,200 mi

Monthly on-time trend

Monthly on-time percentage for ONT to DAL flights50%75%100%August 2024: 91% on-time (35 flights)91Aug 2024September 2024: 77% on-time (34 flights)77October 2024: 74% on-time (31 flights)74November 2024: 87% on-time (30 flights)87Nov 2024December 2024: 77% on-time (31 flights)77January 2025: 87% on-time (31 flights)87February 2025: 89% on-time (28 flights)89Feb 2025March 2025: 87% on-time (31 flights)87April 2025: 76% on-time (33 flights)76May 2025: 50% on-time (34 flights)50May 2025June 2025: 94% on-time (35 flights)94July 2025: 97% on-time (35 flights)97August 2025: 54% on-time (35 flights)54Aug 2025September 2025: 82% on-time (34 flights)82October 2025: 87% on-time (31 flights)87November 2025: 79% on-time (35 flights)79Nov 2025December 2025: 86% on-time (42 flights)86January 2026: 82% on-time (34 flights)82February 2026: 86% on-time (28 flights)86Feb 2026March 2026: 65% on-time (31 flights)65April 2026: 67% on-time (33 flights)67May 2026: 55% on-time (35 flights)55May 2026June 2026: 67% on-time (30 flights)67July 2026: 81% on-time (31 flights)81

Best time to fly from ONT to DAL

Aim for departures around 5 a.m. (98% on-time); avoid 11 a.m. departures (55%).

On-time percentage by scheduled departure hour, ONT to DAL5 a.m.: 98% on-time (45 flights)56 a.m.: 93% on-time (183 flights)67 a.m.: 89% on-time (87 flights)78 a.m.: 88% on-time (60 flights)89 a.m.: 82% on-time (56 flights)910 a.m.: 81% on-time (42 flights)1011 a.m.: 55% on-time (172 flights)1112 p.m.: 78% on-time (25 flights)121 p.m.: 66% on-time (47 flights)133 p.m.: 70% on-time (20 flights)154 p.m.: 59% on-time (45 flights)165 p.m.: 86% on-time (22 flights)17scheduled departure hour

By day of week

DayOn-timeAvg delay
Monday68%16 min
Tuesday84%11 min
Wednesday81%9 min
Thursday71%13 min
Friday71%17 min
Saturdaybest92%6 min
Sunday83%8 min

What causes delays on this route

Share of total delay minutes by cause, as reported by carriers to the US DOT.

  • Late-arriving aircraft41%
  • Airline operations31%
  • National airspace system28%

Frequently asked questions

How often are flights from ONT to DAL delayed?
21% of ONT–DAL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 11 minutes.
What is the best time of day to fly from ONT to DAL?
Departures around 5 a.m. have the best record (98% on-time), while departures around 11 a.m. have the worst (55%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
How long is the flight from ONT to DAL?
The scheduled ONT–DAL flight time averages 2h 52m over 1,200 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
How often are ONT to DAL flights cancelled?
1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
What is the worst month to fly from ONT to DAL?
May 2025 was the roughest month in this dataset, with only 50% of arrivals on time. The best was July 2025 at 97%. If your dates are flexible, that 47-point gap is worth planning around.

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Based on 822 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.