Best Time to Fly STS to SEA: On-Time Stats by Hour & Airline
Charles M. Schulz - Sonoma County → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
463 flights were scheduled from Santa Rosa (STS) to Seattle (SEA) in the last 12 months, and 76.6% of those that flew arrived on time, 1.0 points below the US average of 77.6%.
Among 2 airlines, Alaska Airlines led with 78.5% on time and SkyWest Airlines was last with 70.2%.
Over 24 months, Tuesday was the most reliable day (77% on time) and August the worst month (62%).
The cancellation rate was 1.3% (US average 1.8%).
STS to SEA 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 | 78.5% | 50 min | 1.1% | 357 |
| SkyWest Airlines | 70.2% | 43 min | 1.9% | 106 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STS to SEA
On-time arrival % by scheduled departure hour (local time), 914 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 78.9% | 0.9% | 225 |
| 10am–11am | Limited data | 2 | |
| 11am–12pm | Limited data | 26 | |
| 12pm–1pm | 79.2% | 0.0% | 53 |
| 1pm–2pm | 95.9% | 0.0% | 49 |
| 2pm–3pm | 71.1% | 0.8% | 244 |
| 3pm–4pm | Limited data | 14 | |
| 5pm–6pm | Limited data | 3 | |
| 6pm–7pm | 78.8% | 0.0% | 66 |
| 7pm–8pm | 61.5% | 1.9% | 106 |
| 8pm–9pm | 31.4% | 2.8% | 106 |
| 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 STS to SEA
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) | 62.9% | -10.2 pts | 0.8% | 239 |
| All other days | 73.1% | — | 1.0% | 620 |
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).