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Route Reliability

Portland → STS

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

80
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
2 min
Average arrival delay
1.2%
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 84% of the time across 771 flights. No comparison to make.

What the data says

The late departure is the smart one here.

PDX–STS flights departing between 9 PM–12 AM arrived on time 93% of the time, versus 79% between 6–9 PM.

Sunday scaries are real for this one.

PDX–STS flights arrived on time 88% of the time on Thursdays. On Sundays: 78%.

Trending in the right direction.

PDX–STS flights arrived on time 93% of the time over the last three months in the data, compared with 77% 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
  • Mon84%(111 flights)
  • Tue87%(99 flights)
  • Wed87%(101 flights)
  • Thu88%(111 flights)
  • Fri83%(109 flights)
  • Sat84%(103 flights)
  • Sun78%(113 flights)
On-time by departure window
  • 6–9 AM82%(337 flights)
  • 9 AM–12 PM—(9 flights)
  • 12–3 PM92%(88 flights)
  • 3–6 PM86%(180 flights)
  • 6–9 PM79%(89 flights)
  • 9 PM–12 AM93%(44 flights)
On-time trend by month
94%
May

Jun 77% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%60
July 202584%62
August 202587%62
September 202590%58
October 202580%55
November 202571%59
December 202567%52
January 202677%52
February 202688%51
March 202691%74
April 202694%78
May 202694%84

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.