Route
SEA → STS
Seattle–Tacoma International Airport Charles M. Schulz Sonoma County Airport
618 miles
Return route STS → SEA →
Alerts at SEA and STS
How punctual is this route?
- On-time arrivals
- 82.8%
- Less than 15 minutes late
- Cancelled
- 1.9%
- Of scheduled flights
- Average delay when late
- 50 min
- Flights arriving 15+ minutes late
- Flights tracked
- 420
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 42%
- Airline (crew, maintenance, cleaning) 34%
- Air traffic control & airport 20%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 86.4% | 60 |
| October 2025 | 90.9% | 33 |
| November 2025 | 97.4% | 39 |
| December 2025 | 57.1% | 30 |
| January 2026 | 69.2% | 20 |
| February 2026 | 100.0% | 6 |
| March 2026 | 100.0% | 14 |
| April 2026 | 96.7% | 30 |
| May 2026 | 100.0% | 31 |
| June 2026 | 78.6% | 42 |
| July 2026 | 75.0% | 61 |
| August 2026 | 68.5% | 54 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Alaska Airlines | 358 | 85.6% | 2.2% | 50 min |
| SkyWest Airlines | 62 | 67.2% | 0.0% | 50 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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