HOU to ONT flight delays & on-time performance
Nonstop flights from William P. Hobby Airport to Ontario International Airport · 1,345 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at HOU or ONT right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (HOU) to Ontario (ONT) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 0.3% were cancelled, and 7% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 8am did best (88% on time); around 8pm did worst (60%).
- Thursday was the most reliable day to fly (86% on time) and Sunday the least (72%).
- The largest source of delay minutes was late-arriving aircraft (48%).
Which airline is most on time from HOU 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 | 78% | 0.3% | 14 min | 7.2% | 362 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am87%56 flights
- 8am88%52 flights
- 11am85%13 flights
- 12pm80%11 flights
- 1pm64%28 flights
- 2pm77%44 flights
- 3pm81%37 flights
- 5pm71%24 flights
- 6pm84%19 flights
- 8pm60%15 flights
- 9pm63%50 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday78%0.0% cancelled
- Tuesday80%1.9% cancelled
- Wednesday77%0.0% cancelled
- Thursday86%0.0% cancelled
- Friday79%0.0% cancelled
- Saturday73%0.0% cancelled
- Sunday72%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 aircraft48%
- Airline (crew, maintenance, cleaning, fueling)39%
- Air traffic control & airport congestion10%
- Security3%
- Extreme weather1%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Air traffic control & airport congestion0%
- Security0%
HOU to ONT: common questions
- How often are HOU to ONT flights on time?
- 78% 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 Houston to Ontario cancelled?
- 0.3% of scheduled flights were cancelled (1 of 362).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 55 min behind schedule on average, and 7.2% of flights were an hour or more late.
- How long is taxi time at HOU?
- Flights on this route spent 14 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ONT to HOU — 65% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: HOU → ONT, nonstop flights by US airlines that report to the DOT. How we calculate this.