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

Santa Rosa, CA (STS) to Portland, OR (PDX) flight delay odds

Historically, 88.9% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 578 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
88.9%arrived on time
7.3%30+ min late
1.6%cancelled
578scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.2%all scheduled flights
120+ minutes late1.6%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival-4.1 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning6984.1%2.9%10.1%
Late morning13092.3%6.9%0.0%
Afternoon14188.7%9.9%0.0%
Evening23888.7%7.1%0.8%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday9191.2%4.4%1.1%
Tuesday8088.8%8.8%1.2%
Wednesday7091.4%2.9%0.0%
Thursday9092.2%6.7%0.0%
Friday9191.2%6.6%1.1%
Saturday7279.2%12.5%6.9%
Sunday8486.9%9.5%1.2%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
SkyWest Airlines55289.9%7.4%0.4%
Alaska Airlines2669.2%3.8%26.9%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 20253196.8%3.2%0.0%
August 20254386.0%9.3%0.0%
September 20256095.0%5.0%0.0%
October 20253697.2%2.8%0.0%
November 20255988.1%8.5%1.7%
December 20254470.5%20.5%2.3%
January 20264881.2%6.2%12.5%
February 20263183.9%12.9%3.2%
March 20264597.8%2.2%0.0%
April 20265088.0%12.0%0.0%
May 20267088.6%5.7%0.0%
June 20266193.4%1.6%0.0%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline19.5%
Late aircraft65.7%
National airspace10.5%
Weather4.3%
Security0.0%
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.