Santa Rosa (STS) to Seattle (SEA): On-Time Performance
Data through July 2026
Santa Rosa (STS) to Seattle (SEA) effectively runs on two schedules. In May 2026, 100% of arrivals were on time; in June 2025 that fell to 51% — a 49-point seasonal swing. Across the full period the route averages 71% on-time against a national 78%. Morning departures also hold up better than evening ones (82% vs 56%), which matters most in the rough months.
- On-time
- 71%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 1.3
- last 12 months
- Duration
- 2h 4m
- scheduled
- Distance
- 618 mi
Best airline from STS to SEA
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 76% | 16 min | 1.2% | 328 |
| Alaska Airlines | 69% | 17 min | 0.9% | 646 |
Monthly on-time trend
Best time to fly from STS to SEA
Aim for departures around 1 p.m. (96% on-time); avoid 8 p.m. departures (31%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 63% | 20 min |
| Tuesday | 77% | 11 min |
| Wednesday | 75% | 14 min |
| Thursday | 68% | 16 min |
| Friday | 75% | 14 min |
| Saturdaybest | 77% | 13 min |
| Sunday | 67% | 23 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations23%
- National airspace system28%
- Weather3%
- Security1%
Frequently asked questions
- How often are flights from STS to SEA delayed?
- 29% of STS–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 16 minutes.
- Which airline is most reliable from STS to SEA?
- SkyWest Airlines has the best on-time record on this route at 76%, based on 328 flights. 2 airlines flew STS–SEA frequently enough to compare in this period.
- What is the best time of day to fly from STS to SEA?
- Departures around 1 p.m. have the best record (96% on-time), while departures around 8 p.m. have the worst (31%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STS to SEA?
- The scheduled STS–SEA flight time averages 2h 4m over 618 miles. Actual arrival times vary — flights on this route land 15+ minutes late 29% of the time.
- How often are STS to SEA flights cancelled?
- 1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from STS to SEA?
- June 2025 was the roughest month in this dataset, with only 51% of arrivals on time. The best was May 2026 at 100%. If your dates are flexible, that 49-point gap is worth planning around.
Explore related pages
More routes from STS
Other ways to fly to Seattle (SEA)
Related guides
Based on 974 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.