Houston (IAH) to Ontario (ONT) flights
United Airlines, Frontier Airlines fly nonstop from George Bush Intercontinental Airport to Ontario International Airport, with about 14 flights a week in July 2026. The 1,334-mile flight takes about 3h 22m gate to gate.
- Distance
- 1,334 mi · 2,147 km
- Flight time
- 3h 22m
- Airlines
- 2
- Seats filled
- 78%
Airlines flying IAH to ONT
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 7 | Boeing 737-900, Airbus A319, Boeing 737-900ER | 49,579 | 3h 22m |
| Frontier Airlines | 7 | Airbus A320neo, Airbus A321, Airbus A320-100/200 | 31,757 | 3h 23m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAH to ONT flight schedule
2 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 6:10am and the last at 8:31pm. 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) |
|---|---|---|---|---|
| F9 3131Frontier Airlines | 6:10am | 7:32am | 31 | 82% |
| UA 1563United Airlines | 8:31pm | 9:55pm | 19 | 80% |
Is IAH to ONT on time?
From September 2025 to August 2026, 81% of 574 flights arrived within 15 minutes of schedule and 0.2% were cancelled. Flights leaving around 6am were the most punctual (95%), those around 4pm the least (71%). Most delay time was caused by late-arriving aircraft (57%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 356 | 80% | 13 min | 0% |
| Frontier Airlines | 218 | 82% | 11 min | 0.5% |
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 | 12 | 92% | |
| 6am to 7am | 75 | 95% | |
| 10am to 11am | 12 | 100% | |
| 2pm to 3pm | 24 | 71% | |
| 3pm to 4pm | 17 | 65% | |
| 4pm to 5pm | 38 | 71% | |
| 5pm to 6pm | 34 | 82% | |
| 7pm to 8pm | 61 | 74% | |
| 8pm to 9pm | 294 | 81% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 39 | 5,893 | |
| September 2025 | 44 | 6,811 | |
| October 2025 | 49 | 6,868 | |
| November 2025 | 47 | 5,944 | |
| December 2025 | 43 | 6,686 | |
| January 2026 | 41 | 5,360 | |
| February 2026 | 36 | 4,702 | |
| March 2026 | 40 | 5,257 | |
| April 2026 | 39 | 6,062 | |
| May 2026 | 61 | 9,524 | |
| June 2026 | 60 | 8,721 | |
| July 2026 | 62 | 9,508 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.