Ontario (ONT) to Houston (IAH) flights
United Airlines, Frontier Airlines fly nonstop from Ontario International Airport to George Bush Intercontinental Airport, with about 14 flights a week in July 2026. The 1,334-mile flight takes about 3h 10m gate to gate.
- Distance
- 1,334 mi · 2,147 km
- Flight time
- 3h 10m
- Airlines
- 2
- Seats filled
- 79%
Airlines flying ONT to IAH
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 7 | Boeing 737-900, Airbus A319, Boeing 737-900ER | 51,516 | 3h 9m |
| Frontier Airlines | 7 | Airbus A321, Airbus A320neo, Airbus A320-100/200 | 31,138 | 3h 13m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
ONT to IAH flight schedule
2 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 5:45am and the last at 9:36am. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 1936United Airlines | 5:45am | 11:04am | 19 | 92% |
| F9 2412Frontier Airlines | 9:36am | 2:56pm | 31 | 81% |
Is ONT to IAH on time?
From September 2025 to August 2026, 86% of 574 flights arrived within 15 minutes of schedule and 1.2% were cancelled. Flights leaving around 6am were the most punctual (92%), those around 8pm the least (70%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (41%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 356 | 92% | 9 min | 0.6% |
| Frontier Airlines | 218 | 78% | 15 min | 2.3% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 5am to 6am | 82 | 90% | |
| 6am to 7am | 254 | 92% | |
| 8am to 9am | 29 | 86% | |
| 9am to 10am | 55 | 87% | |
| 12pm to 1pm | 28 | 82% | |
| 1pm to 2pm | 24 | 88% | |
| 3pm to 4pm | 13 | 69% | |
| 5pm to 6pm | 30 | 71% | |
| 8pm to 9pm | 30 | 70% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 40 | 6,191 | |
| September 2025 | 43 | 6,308 | |
| October 2025 | 48 | 7,131 | |
| November 2025 | 48 | 5,943 | |
| December 2025 | 44 | 6,805 | |
| January 2026 | 42 | 5,544 | |
| February 2026 | 36 | 5,291 | |
| March 2026 | 38 | 5,645 | |
| April 2026 | 39 | 6,390 | |
| May 2026 | 62 | 8,707 | |
| June 2026 | 57 | 9,355 | |
| July 2026 | 61 | 9,813 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.