Santa Rosa (STS) to San Diego (SAN) flights
SkyWest Airlines, Southwest Airlines, Horizon Air fly nonstop from Charles M. Schulz Sonoma County Airport to San Diego International Airport, with about 30 flights a week in July 2026. The 508-mile flight takes about 1h 46m gate to gate.
- Distance
- 508 mi · 818 km
- Flight time
- 1h 46m
- Airlines
- 3
- Seats filled
- 76%
Airlines flying STS to SAN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| SkyWest Airlines | 13 | Embraer E175, Bombardier CRJ200 | 48,839 | 1h 49m |
| Southwest Airlines | 11 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8 | 15,444 | 1h 35m |
| Horizon Air | 7 | Embraer E175 | 4,988 | 1h 43m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STS to SAN flight schedule
6 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 6:00am and the last at 6:47pm. 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) |
|---|---|---|---|---|
| WN 3900Southwest Airlines | 6:00am | 7:40am | 28 | 93% |
| AS 3315Alaska Airlines · operated by SkyWest Airlines | 6:26am | 8:15am | 31 | 89% |
| AS 3047Alaska Airlines · operated by SkyWest Airlines | 11:04am | 12:50pm | 31 | 55% |
| WN 3901Southwest Airlines | 4:40pm | 6:20pm | 16 | 31% |
| AS 2257Alaska Airlines · operated by Horizon Air | 5:56pm | 7:35pm | 17 | 41% |
| AS 3046Alaska Airlines · operated by SkyWest Airlines | 6:47pm | 8:36pm | 11 | 27% |
Is STS to SAN on time?
From September 2025 to August 2026, 71% of 1,166 flights arrived within 15 minutes of schedule and 4.1% were cancelled. Flights leaving around 6am were the most punctual (92%), those around 5pm the least (39%). Most delay time was caused by air traffic control and airport congestion (35%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 936 | 71% | 19 min | 5% |
| Southwest Airlines | 230 | 75% | 16 min | 0.4% |
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 | 337 | 92% | |
| 7am to 8am | 87 | 88% | |
| 9am to 10am | 60 | 80% | |
| 10am to 11am | 106 | 67% | |
| 11am to 12pm | 60 | 54% | |
| 2pm to 3pm | 59 | 70% | |
| 3pm to 4pm | 48 | 75% | |
| 4pm to 5pm | 46 | 57% | |
| 5pm to 6pm | 112 | 39% | |
| 6pm to 7pm | 67 | 65% | |
| 7pm to 8pm | 157 | 60% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 71 | 4,456 | |
| September 2025 | 79 | 4,580 | |
| October 2025 | 82 | 4,997 | |
| November 2025 | 80 | 4,473 | |
| December 2025 | 49 | 3,268 | |
| January 2026 | 50 | 3,125 | |
| February 2026 | 44 | 3,037 | |
| March 2026 | 69 | 4,435 | |
| April 2026 | 121 | 8,213 | |
| May 2026 | 136 | 9,121 | |
| June 2026 | 136 | 9,640 | |
| July 2026 | 134 | 9,926 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.