Ontario (ONT) to Santa Rosa (STS) flights
SkyWest Airlines flies nonstop from Ontario International Airport to Charles M. Schulz Sonoma County Airport, with about 7 flights a week in July 2026. The 423-mile flight takes about 1h 31m gate to gate.
- Distance
- 423 mi · 681 km
- Flight time
- 1h 31m
- Airlines
- 1
- Seats filled
- 55%
Airlines flying ONT to STS
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| SkyWest Airlines | 7 | Embraer E175 | 4,473 | 1h 33m |
| Horizon AirSeasonal or ended | n/a | Embraer E175 | 1,180 | 1h 25m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
ONT to STS flight schedule
2 flight numbers flew this route in August 2026. The first usually leaves at 4:27pm and the last at 6:43pm. 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) |
|---|---|---|---|---|
| AS 3031Alaska Airlines · operated by SkyWest Airlines | 4:27pm | 6:07pm | 13 | 92% |
| AS 3086Alaska Airlines · operated by SkyWest Airlines | 6:43pm | 8:14pm | 18 | 91% |
Is ONT to STS on time?
From September 2025 to August 2026, 93% of 167 flights arrived within 15 minutes of schedule and 0% were cancelled. Flights leaving around 3pm were the most punctual (100%), those around 12pm the least (86%). Most delay time was caused by late-arriving aircraft (59%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 167 | 93% | 5 min | 0% |
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 |
|---|---|---|---|
| 12pm to 1pm | 21 | 86% | |
| 3pm to 4pm | 28 | 100% | |
| 4pm to 5pm | 48 | 94% | |
| 6pm to 7pm | 70 | 91% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| March 2026 | 14 | 804 | |
| April 2026 | 30 | 1,396 | |
| May 2026 | 31 | 1,326 | |
| June 2026 | 30 | 1,111 | |
| July 2026 | 31 | 1,016 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.