ONT to HOU flight delays & on-time performance
Nonstop flights from Ontario International Airport to William P. Hobby Airport · 1,345 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ONT or HOU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Ontario (ONT) to Houston (HOU) arrived on time 65% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0% were cancelled, and 6% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 6am did best (97% on time); around 2pm did worst (29%).
- Tuesday was the most reliable day to fly (79% on time) and Sunday the least (53%).
- The largest source of delay minutes was late-arriving aircraft (44%).
Which airline is most on time from ONT to HOU?
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 | 65% | 0.0% | 17 min | 6.4% | 362 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%83 flights
- 6am97%33 flights
- 9am74%34 flights
- 11am80%15 flights
- 12pm52%52 flights
- 1pm50%76 flights
- 2pm29%65 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday62%0.0% cancelled
- Tuesday79%0.0% cancelled
- Wednesday71%0.0% cancelled
- Thursday61%0.0% cancelled
- Friday56%0.0% cancelled
- Saturday75%0.0% cancelled
- Sunday53%0.0% 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 aircraft44%
- Airline (crew, maintenance, cleaning, fueling)37%
- Air traffic control & airport congestion19%
- Security0%
- Extreme weather0%
Why flights are cancelled
Share of cancellations by reason.
No cancellation causes recorded in this period.
ONT to HOU: common questions
- How often are ONT to HOU flights on time?
- 65% 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 Ontario to Houston cancelled?
- 0.0% of scheduled flights were cancelled (0 of 362).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 44 min behind schedule on average, and 6.4% of flights were an hour or more late.
- How long is taxi time at ONT?
- Flights on this route spent 12 min taxiing from the gate to takeoff on average.
Related routes
Return trip: HOU to ONT — 78% on time
More flights from Ontario
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ONT → HOU, nonstop flights by US airlines that report to the DOT. How we calculate this.