Ontario (ONT) to Dallas/Fort Worth (DFW): On-Time Performance
Data through July 2026
When you fly ONT to DFW matters as much as anything else about the booking: the route swung from 93% on-time in October 2024 to just 65% in July 2025. Across the full period the route averages 79% on-time against a national 78%.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 2.4%
- Flights/day
- 6.3
- last 12 months
- Duration
- 3h 2m
- scheduled
- Distance
- 1,188 mi
Best airline from ONT to DFW
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| American Airlinesmost reliable | 80% | 20 min | 2.3% | 4,191 |
| Frontier Airlines | 74% | 18 min | 2.9% | 694 |
Monthly on-time trend
Best time to fly from ONT to DFW
Aim for departures around 5 a.m. (90% on-time); avoid 2 p.m. departures (70%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 20 min |
| Tuesday | 80% | 21 min |
| Wednesday | 79% | 18 min |
| Thursdaybest | 80% | 18 min |
| Friday | 80% | 22 min |
| Saturday | 79% | 18 min |
| Sunday | 78% | 24 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations42%
- National airspace system12%
- Weather3%
Frequently asked questions
- How often are flights from ONT to DFW delayed?
- 21% of ONT–DFW 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 20 minutes.
- Which airline is most reliable from ONT to DFW?
- American Airlines has the best on-time record on this route at 80%, based on 4,191 flights. 2 airlines flew ONT–DFW frequently enough to compare in this period.
- What is the best time of day to fly from ONT to DFW?
- Departures around 5 a.m. have the best record (90% on-time), while departures around 2 p.m. have the worst (70%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ONT to DFW?
- The scheduled ONT–DFW flight time averages 3h 2m over 1,188 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are ONT to DFW flights cancelled?
- 2.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from ONT to DFW?
- July 2025 was the roughest month in this dataset, with only 65% of arrivals on time. The best was October 2024 at 93%. If your dates are flexible, that 28-point gap is worth planning around.
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Based on 4,885 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.