Ontario (ONT) to Dallas (DAL): On-Time Performance
Data through May 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
- 10 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
Best time to fly from ONT to DAL
Aim for departures around 5 a.m. (98% on-time); avoid 11 a.m. departures (56%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 69% | 14 min |
| Tuesday | 84% | 11 min |
| Wednesday | 81% | 9 min |
| Thursday | 73% | 12 min |
| Friday | 70% | 15 min |
| Saturdaybest | 92% | 6 min |
| Sunday | 84% | 7 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft37%
- Airline operations33%
- National airspace system30%
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 2024-06 and 2026-05. The average arrival delay across completed flights was 10 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 (56%). 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 2024-06 and 2026-05, 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 794 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.