DAL to ONT flight delays & on-time performance
Nonstop flights from Dallas Love Field to Ontario International Airport · 1,200 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at DAL or ONT right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Dallas (DAL) to Ontario (ONT) arrived on time 68% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.3% were cancelled, and 10% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 9am did best (85% on time); around 4pm did worst (47%).
- Wednesday was the most reliable day to fly (79% on time) and Sunday the least (59%).
- The largest source of delay minutes was late-arriving aircraft (62%).
Which airline is most on time from DAL to ONT?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 68% | 1.3% | 19 min | 9.6% | 399 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am100%12 flights
- 9am85%20 flights
- 12pm61%32 flights
- 1pm75%29 flights
- 2pm73%38 flights
- 4pm47%15 flights
- 5pm77%52 flights
- 6pm67%79 flights
- 7pm58%80 flights
- 8pm33%12 flights
- 9pm60%15 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday62%0.0% cancelled
- Tuesday72%1.8% cancelled
- Wednesday79%0.0% cancelled
- Thursday73%1.9% cancelled
- Friday64%0.0% cancelled
- Saturday71%3.5% cancelled
- Sunday59%1.4% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft62%
- Airline (crew, maintenance, cleaning, fueling)29%
- Air traffic control & airport congestion5%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather80%
- Air traffic control & airport congestion20%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
DAL to ONT: common questions
- How often are DAL to ONT flights on time?
- 68% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Dallas to Ontario cancelled?
- 1.3% of scheduled flights were cancelled (5 of 399).
- How long are typical delays?
- Across all flights the average arrival delay was 19 min (early arrivals count as zero). Flights that were late arrived 55 min behind schedule on average, and 9.6% of flights were an hour or more late.
- How long is taxi time at DAL?
- Flights on this route spent 12 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ONT to DAL — 74% on time
More flights from Dallas
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: DAL → ONT, nonstop flights by US airlines that report to the DOT. How we calculate this.