Route
STS → SEA
Charles M. Schulz Sonoma County Airport Seattle–Tacoma International Airport
618 miles
Return route SEA → STS →
Alerts at STS and SEA
How punctual is this route?
- On-time arrivals
- 77.5%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 52 min
- Flights arriving 15+ minutes late
- Flights tracked
- 454
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Air traffic control & airport 28%
- Airline (crew, maintenance, cleaning) 27%
- Extreme weather 1%
- 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 | 73.3% | 60 |
| October 2025 | 91.2% | 34 |
| November 2025 | 81.6% | 39 |
| December 2025 | 53.6% | 30 |
| January 2026 | 78.9% | 20 |
| February 2026 | 73.9% | 23 |
| March 2026 | 80.0% | 31 |
| April 2026 | 83.3% | 30 |
| May 2026 | 100.0% | 31 |
| June 2026 | 83.3% | 42 |
| July 2026 | 75.4% | 61 |
| August 2026 | 64.2% | 53 |
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 | 80.3% | 0.8% | 53 min |
| SkyWest Airlines | 96 | 67.0% | 2.1% | 49 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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