Ontario (ONT) to San Francisco (SFO) flights
United Airlines, Frontier Airlines, SkyWest Airlines fly nonstop from Ontario International Airport to San Francisco International Airport, with about 28 flights a week in July 2026. The 363-mile flight takes about 1h 32m gate to gate.
- Distance
- 363 mi · 584 km
- Flight time
- 1h 32m
- Airlines
- 3
- Seats filled
- 73%
Airlines flying ONT to SFO
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 14 | Boeing 737 MAX 9, Airbus A320-100/200, Boeing 737 MAX 8 | 113,207 | 1h 29m |
| Frontier Airlines | 7 | Airbus A320neo, Airbus A321, Airbus A320-100/200 | 27,310 | 1h 39m |
| SkyWest Airlines | 7 | Embraer E175, Bombardier CRJ700 | 7,438 | 1h 40m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
ONT to SFO flight schedule
6 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 6:08am and the last at 7:13pm. 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 2363United Airlines | 6:08am | 7:35am | 31 | 90% |
| F9 1159Frontier Airlines | 8:58am | 10:25am | 31 | 32% |
| UA 2052United Airlines | 9:01am | 10:30am | 17 | 53% |
| UA 1375United Airlines | 1:56pm | 3:25pm | 31 | 54% |
| UA 5624United Airlines · operated by SkyWest Airlines | 6:39pm | 8:07pm | 7 | 13% |
| UA 1665United Airlines | 7:13pm | 8:56pm | 12 | 51% |
Is ONT to SFO on time?
From September 2025 to August 2026, 61% of 1,335 flights arrived within 15 minutes of schedule and 0.7% were cancelled. Flights leaving around 6am were the most punctual (91%), those around 8am the least (30%). Most delay time was caused by air traffic control and airport congestion (63%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,124 | 65% | 23 min | 0.5% |
| Frontier Airlines | 211 | 38% | 41 min | 1.9% |
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 |
|---|---|---|---|
| 6am to 7am | 324 | 91% | |
| 8am to 9am | 78 | 30% | |
| 9am to 10am | 61 | 51% | |
| 10am to 11am | 38 | 47% | |
| 11am to 12pm | 31 | 36% | |
| 1pm to 2pm | 341 | 65% | |
| 6pm to 7pm | 303 | 45% | |
| 8pm to 9pm | 49 | 14% | |
| 9pm to 10pm | 29 | 69% | |
| 10pm to 11pm | 51 | 57% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 108 | 14,439 | |
| September 2025 | 108 | 14,989 | |
| October 2025 | 114 | 16,415 | |
| November 2025 | 103 | 13,907 | |
| December 2025 | 102 | 11,425 | |
| January 2026 | 92 | 8,046 | |
| February 2026 | 79 | 8,571 | |
| March 2026 | 101 | 11,804 | |
| April 2026 | 125 | 11,626 | |
| May 2026 | 125 | 13,220 | |
| June 2026 | 120 | 11,665 | |
| July 2026 | 122 | 11,848 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.