Best Time to Fly SEA to STS: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Charles M. Schulz - Sonoma County
Data through July 2026 · Last updated October 18, 2026
428 flights were scheduled from Seattle (SEA) to Santa Rosa (STS) in the last 12 months, and 84.1% of those that flew arrived on time, 6.5 points above the US average of 77.6%.
Among 2 airlines, Alaska Airlines led with 86.1% on time and SkyWest Airlines was last with 74.3%.
Over 24 months, Tuesday was the most reliable day (89% on time) and June the worst month (64%).
The cancellation rate was 2.1% (US average 1.8%).
SEA to STS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlines | 86.1% | 49 min | 2.5% | 357 |
| SkyWest Airlines | 74.3% | 48 min | 0.0% | 71 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to STS
On-time arrival % by scheduled departure hour (local time), 878 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 28 | |
| 9am–10am | 84.2% | 0.0% | 76 |
| 10am–11am | 98.0% | 0.0% | 49 |
| 11am–12pm | 73.3% | 0.6% | 318 |
| 12pm–1pm | 81.1% | 0.0% | 37 |
| 3pm–4pm | 60.8% | 1.9% | 52 |
| 4pm–5pm | 95.6% | 0.0% | 45 |
| 5pm–6pm | 62.6% | 0.9% | 108 |
| 6pm–7pm | 100.0% | 0.0% | 44 |
| 7pm–8pm | 81.4% | 0.0% | 59 |
| 8pm–9pm | 68.3% | 0.0% | 42 |
| 9pm–10pm | Limited data | 20 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to STS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 26 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 29 | ||
| Summer peak (Jun 15 - Aug 15) | 66.2% | -14.4 pts | 0.4% | 239 |
| All other days | 80.6% | — | 1.4% | 584 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).