BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
STS→SEA

Santa Rosa, CA (STS) to Seattle, WA (SEA) flight delay odds

73.0% of 463 official scheduled STS-to-SEA flights arrived on time; 15.1% arrived at least 30 minutes late and 1.5% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
73.0%arrived on time
15.1%30+ min late
1.5%cancelled
463scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.8%all scheduled flights
120+ minutes late1.7%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+6.8 mincompleted flights

Which departure time was most reliable for STS to SEA?

Among qualifying STS-to-SEA departure window results, Early morning had the highest on-time rate: 83.2% of 95 flights. Evening was lowest at 55.7% across 140 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning9583.2%7.4%0.0%
Afternoon20879.3%12.5%1.0%
Evening14055.7%25.7%2.9%

Which weekday was most reliable for STS to SEA?

Among qualifying STS-to-SEA weekday results, Saturday had the highest on-time rate: 80.3% of 61 flights. Sunday was lowest at 67.1% across 70 flights.

DayFlightsOn time30+ minCancelled
Monday7070.0%17.1%0.0%
Tuesday6371.4%14.3%0.0%
Wednesday6177.0%14.8%0.0%
Thursday6975.4%14.5%0.0%
Friday6971.0%17.4%5.8%
Saturday6180.3%14.8%1.6%
Sunday7067.1%12.9%2.9%

Which airline was most reliable for STS to SEA?

Among qualifying STS-to-SEA airline results, Alaska Airlines had the highest on-time rate: 73.3% of 356 flights. SkyWest Airlines was lowest at 72.0% across 107 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines35673.3%15.7%1.4%
SkyWest Airlines10772.0%13.1%1.9%

Which month was most reliable for STS to SEA?

Among qualifying STS-to-SEA month results, May 2026 had the highest on-time rate: 100.0% of 31 flights. December 2025 was lowest at 50.0% across 30 flights.

MonthFlightsOn time30+ minCancelled
July 20256155.7%26.2%1.6%
August 20256258.1%24.2%1.6%
September 20256073.3%16.7%0.0%
October 20253491.2%5.9%0.0%
November 20253979.5%7.7%2.6%
December 20253050.0%30.0%6.7%
January 20262075.0%10.0%5.0%
February 20262373.9%21.7%0.0%
March 20263177.4%6.5%3.2%
April 20263083.3%13.3%0.0%
May 202631100.0%0.0%0.0%
June 20264283.3%4.8%0.0%

What drove STS to SEA delay minutes?

Late aircraft was the largest recorded STS-to-SEA delay category, accounting for 43.4% of 5,663 BTS-attributed delay minutes during July 2025–June 2026.

Airline23.5%
Late aircraft43.4%
National airspace32.4%
Weather0.5%
Security0.2%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.