67% of flights from Dallas to Ontario arrived on time over the past 12 months. That is worse than the typical U.S. route. 11% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for DAL → ONT: when a flight was late, it was under 45 minutes late 56% of the time. About 1 in 11 flights landed an hour or more late, and 1 in 66 three hours or more; 1.3% were cancelled outright.
- On time or early67%
- 15–30 min late13%
- 30–60 min late9.6%
- 1–2 hours late6.3%
- 2–3 hours late1.5%
- 3+ hours late1.5%
- Diverted0.0%
- Cancelled1.3%
Share of all 395 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Southwest Airlines | 395 | 67% | 1.3% | +3 min | 9.4% | +56 min | Southwest Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at DAL). Delays build through the day as late planes knock on, so early flights usually do best.
By month
Each calendar month pooled over 2023–2026. Best: December (79%). Worst: May (54%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 56 | — | — |
| Tuesday | 55 | — | — |
| Wednesday | 53 | — | — |
| Thursday | 52 | — | — |
| Friday | 55 | — | — |
| Saturday | 57 | — | — |
| Sunday | 67 | — | — |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 4 · air traffic/airport 1
Month by month
Not enough months with data to draw a trend.
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Dallas or Ontario. DFW → SNA has been 10 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| DAL → ONT (this route) | 395 | 67% | 1.3% |
| DFW → SNA Dallas/Fort Worth to Orange County John Wayne | 2,956 | 77% | 2.4% |
| DFW → LAX Dallas/Fort Worth to Los Angeles LAX | 6,184 | 72% | 2.1% |
| DAL → BUR Dallas Love Field to Hollywood Burbank | 394 | 70% | 1.5% |
| DAL → LGB Dallas Love Field to Long Beach | 484 | 70% | 1.2% |
| DFW → ONT Dallas/Fort Worth to Ontario | 2,274 | 70% | 2.2% |
| DAL → SNA Dallas Love Field to Orange County John Wayne | 368 | 70% | 0.8% |
Questions
How often are flights from DAL to ONT on time?
67% of 395 scheduled flights from Dallas, TX to Ontario, CA arrived within 15 minutes of schedule between September 2025 and August 2026. 1.3% were cancelled.
What month has the most delays from DAL to ONT?
May (54% on time). The best month is December (79%), over 2023–2026.
Related
- ONT → DAL (return)
- Dallas Love Field (DAL) delays by hour
- Flights into Ontario (ONT)
- Southwest Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.