Seattle (SEA) to Santa Rosa (STS): On-Time Performance
Data through May 2026
The calendar drives reliability on SEA–STS. May 2026 flights landed on schedule 100% of the time, but June 2025 dropped to 53% — a gap of 47 points. Across the full period the route averages 77% on-time against a national 78%.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 1.2
- last 12 months
- Duration
- 2h 5m
- scheduled
- Distance
- 618 mi
Best airline from SEA to STS
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlinesmost reliable | 80% | 11 min | 1.5% | 614 |
| SkyWest Airlines | 70% | 18 min | 0.4% | 269 |
Monthly on-time trend
Best time to fly from SEA to STS
Aim for departures around 10 a.m. (100% on-time); avoid 3 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 10 min |
| Tuesdaybest | 85% | 9 min |
| Wednesday | 75% | 12 min |
| Thursday | 73% | 15 min |
| Friday | 73% | 14 min |
| Saturday | 80% | 12 min |
| Sunday | 77% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft35%
- Airline operations41%
- National airspace system20%
- Weather4%
Frequently asked questions
- How often are flights from SEA to STS delayed?
- 23% of SEA–STS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 13 minutes.
- Which airline is most reliable from SEA to STS?
- Alaska Airlines has the best on-time record on this route at 80%, based on 614 flights. 2 airlines flew SEA–STS frequently enough to compare in this period.
- What is the best time of day to fly from SEA to STS?
- Departures around 10 a.m. have the best record (100% on-time), while departures around 3 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to STS?
- The scheduled SEA–STS flight time averages 2h 5m over 618 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are SEA to STS flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to STS?
- June 2025 was the roughest month in this dataset, with only 53% of arrivals on time. The best was May 2026 at 100%. If your dates are flexible, that 47-point gap is worth planning around.
Explore related pages
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Based on 883 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.