Santa Rosa (STS) to Seattle (SEA) flights
Alaska Airlines, SkyWest Airlines fly nonstop from Charles M. Schulz Sonoma County Airport to Seattle-Tacoma International Airport, with about 14 flights a week in July 2026. The 618-mile flight takes about 2h 2m gate to gate.
- Distance
- 618 mi · 995 km
- Flight time
- 2h 2m
- Airlines
- 2
- Seats filled
- 74%
Airlines flying STS to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 7 | Boeing 737-800, Boeing 737 MAX 8, Boeing 737-900ER | 40,687 | 2h 3m |
| SkyWest Airlines | 7 | Embraer E175 | 6,097 | 2h 7m |
| Horizon AirSeasonal or ended | n/a | Embraer E175 | 13,416 | 1h 57m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STS to SEA flight schedule
3 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 7:03am and the last at 7:23pm. 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 1331Alaska Airlines | 7:03am | 9:00am | 12 | 83% |
| AS 1322Alaska Airlines | 12:52pm | 2:55pm | 31 | 75% |
| AS 3044Alaska Airlines · operated by SkyWest Airlines | 7:23pm | 9:30pm | 10 | 65% |
Is STS to SEA on time?
From September 2025 to August 2026, 78% of 684 flights arrived within 15 minutes of schedule and 1.8% were cancelled. Flights leaving around 1pm were the most punctual (96%), those around 7pm the least (54%). Most delay time was caused by late-arriving aircraft (43%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 684 | 78% | 12 min | 1.8% |
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 | 20 | 77% | |
| 7am to 8am | 93 | 93% | |
| 11am to 12pm | 105 | 89% | |
| 12pm to 1pm | 70 | 77% | |
| 1pm to 2pm | 49 | 96% | |
| 2pm to 3pm | 126 | 73% | |
| 5pm to 6pm | 16 | 81% | |
| 6pm to 7pm | 35 | 80% | |
| 7pm to 8pm | 112 | 54% | |
| 8pm to 9pm | 38 | 65% | |
| 9pm to 10pm | 20 | 84% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 61 | 6,154 | |
| September 2025 | 60 | 6,678 | |
| October 2025 | 62 | 5,761 | |
| November 2025 | 58 | 4,933 | |
| December 2025 | 54 | 4,666 | |
| January 2026 | 49 | 3,194 | |
| February 2026 | 51 | 3,069 | |
| March 2026 | 60 | 4,217 | |
| April 2026 | 57 | 4,816 | |
| May 2026 | 60 | 5,346 | |
| June 2026 | 51 | 5,319 | |
| July 2026 | 62 | 6,047 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.