Dallas (DAL) to Ontario (ONT): On-Time Performance
Data through May 2026
Dallas (DAL) to Ontario (ONT) effectively runs on two schedules. In November 2024, 90% of arrivals were on time; in May 2025 that fell to 53% — a 37-point seasonal swing. Across the full period the route averages 70% on-time against a national 78%.
- On-time
- 70%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 1.1
- last 12 months
- Duration
- 3h 11m
- scheduled
- Distance
- 1,200 mi
Monthly on-time trend
Best time to fly from DAL to ONT
Aim for departures around 2 p.m. (89% on-time); avoid 9 p.m. departures (41%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 65% | 24 min |
| Tuesday | 72% | 14 min |
| Wednesday | 73% | 11 min |
| Thursday | 74% | 16 min |
| Friday | 74% | 14 min |
| Saturdaybest | 77% | 16 min |
| Sunday | 61% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft60%
- Airline operations30%
- National airspace system7%
- Weather3%
Frequently asked questions
- How often are flights from DAL to ONT delayed?
- 30% of DAL–ONT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 17 minutes.
- What is the best time of day to fly from DAL to ONT?
- Departures around 2 p.m. have the best record (89% on-time), while departures around 9 p.m. have the worst (41%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DAL to ONT?
- The scheduled DAL–ONT flight time averages 3h 11m over 1,200 miles. Actual arrival times vary — flights on this route land 15+ minutes late 30% of the time.
- How often are DAL to ONT flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from DAL to ONT?
- May 2025 was the roughest month in this dataset, with only 53% of arrivals on time. The best was November 2024 at 90%. If your dates are flexible, that 37-point gap is worth planning around.
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Based on 795 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.