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Route Reliability

STS → Portland

STS–PDX · 489 miles · STS Airport to Portland International Airport

87
Pretty Reliable
WanderNerd Reliability Score
90%
Arrive within 15 minutes
2 min early
Average arrival delay
2.7%
Cancelled
771
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 90% of the time across 771 flights. No comparison to make.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 94% of the time, against 87% between 6–9 PM.

Thursday has been the better bet.

A small edge: 92% on time on Thursdays against 86% on Saturdays.

Ticking up lately.

STS–PDX flights arrived on time 93% of the time over the last three months in the data, compared with 87% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon92%(110 flights)
  • Tue88%(100 flights)
  • Wed92%(98 flights)
  • Thu92%(113 flights)
  • Fri89%(114 flights)
  • Sat86%(99 flights)
  • Sun90%(115 flights)
On-time by departure window
  • 6–9 AM94%(142 flights)
  • 9 AM–12 PM91%(152 flights)
  • 12–3 PM87%(102 flights)
  • 3–6 PM92%(66 flights)
  • 6–9 PM87%(287 flights)
On-time trend by month
89%
May

Jun 82% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%60
July 202594%62
August 202590%62
September 202595%60
October 202585%58
November 202590%58
December 202577%51
January 202694%48
February 202690%51
March 202697%75
April 202691%79
May 202689%85

Keep nerding

Based on 771 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.