SEA to STS flight delays & on-time performance
Nonstop flights from Seattle–Tacoma International Airport to Charles M. Schulz Sonoma County Airport · 618 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SEA or STS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Seattle (SEA) to Santa Rosa (STS) arrived on time 84% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 2.1% were cancelled, and 4% arrived an hour or more late.
- Alaska Airlines was the most punctual airline here (86% on time); SkyWest Airlines was the least (74%).
- Departures scheduled around 6pm did best (100% on time); around 5pm did worst (67%).
- Tuesday was the most reliable day to fly (91% on time) and Friday the least (78%).
- The largest source of delay minutes was late-arriving aircraft (43%).
Which airline is most on time from SEA to STS?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Alaska Airlines | 86% | 2.5% | 8 min | 2.6% | 357 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 74% | 0.0% | 14 min | 8.6% | 71 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 9am81%52 flights
- 10am98%49 flights
- 11am78%157 flights
- 3pm100%10 flights
- 4pm97%35 flights
- 5pm67%19 flights
- 6pm100%44 flights
- 8pm68%42 flights
- 9pm92%20 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday88%0.0% cancelled
- Tuesday91%0.0% cancelled
- Wednesday82%0.0% cancelled
- Thursday86%1.6% cancelled
- Friday78%9.1% cancelled
- Saturday78%0.0% cancelled
- Sunday85%3.1% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft43%
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion20%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather89%
- Airline (crew, maintenance, cleaning, fueling)11%
- Air traffic control & airport congestion0%
- Security0%
SEA to STS: common questions
- How often are SEA to STS flights on time?
- 84% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Seattle to Santa Rosa cancelled?
- 2.1% of scheduled flights were cancelled (9 of 428).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 49 min behind schedule on average, and 3.6% of flights were an hour or more late.
- How long is taxi time at SEA?
- Flights on this route spent 23 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STS to SEA — 77% on time
More flights from Seattle
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SEA → STS, nonstop flights by US airlines that report to the DOT. How we calculate this.