STS to SEA flight delays & on-time performance
Nonstop flights from Charles M. Schulz Sonoma County Airport to Seattle–Tacoma International Airport · 618 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STS or SEA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Santa Rosa (STS) to Seattle (SEA) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.3% were cancelled, and 5% arrived an hour or more late.
- Alaska Airlines was the most punctual airline here (78% on time); SkyWest Airlines was the least (70%).
- Departures scheduled around 1pm did best (96% on time); around 8pm did worst (37%).
- Saturday was the most reliable day to fly (86% on time) and Sunday the least (71%).
- The largest source of delay minutes was late-arriving aircraft (49%).
Which airline is most on time from STS to SEA?
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 | 78% | 1.1% | 12 min | 5.1% | 357 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 70% | 1.9% | 15 min | 6.7% | 106 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am81%64 flights
- 12pm81%52 flights
- 1pm96%49 flights
- 2pm73%138 flights
- 6pm80%35 flights
- 7pm74%73 flights
- 8pm37%29 flights
- 9pm84%20 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday74%0.0% cancelled
- Tuesday74%0.0% cancelled
- Wednesday77%0.0% cancelled
- Thursday78%0.0% cancelled
- Friday76%5.6% cancelled
- Saturday86%1.7% cancelled
- Sunday71%1.4% 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 aircraft49%
- Air traffic control & airport congestion28%
- Airline (crew, maintenance, cleaning, fueling)22%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather83%
- Airline (crew, maintenance, cleaning, fueling)17%
- Air traffic control & airport congestion0%
- Security0%
STS to SEA: common questions
- How often are STS to SEA flights on time?
- 77% 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 Santa Rosa to Seattle cancelled?
- 1.3% of scheduled flights were cancelled (6 of 463).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 48 min behind schedule on average, and 5.5% of flights were an hour or more late.
- How long is taxi time at STS?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SEA to STS — 84% on time
More flights from Santa Rosa
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: STS → SEA, nonstop flights by US airlines that report to the DOT. How we calculate this.