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Route Reliability

Seattle → STS

SEA–STS · 618 miles · Seattle–Tacoma International Airport to STS Airport

74
Usually Fine
WanderNerd Reliability Score
81%
Arrive within 15 minutes
2 min
Average arrival delay
2.7%
Cancelled
701
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 81% of the time across 701 flights. No comparison to make.

What the data says

The late departure is the smart one here.

SEA–STS flights departing between 9 PM–12 AM arrived on time 94% of the time, versus 75% between 3–6 PM.

Friday is doing you no favors.

SEA–STS flights arrived on time 86% of the time on Mondays. On Fridays: 76%.

Trending in the right direction.

SEA–STS flights arrived on time 90% of the time over the last three months in the data, compared with 74% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon86%(101 flights)
  • Tue81%(91 flights)
  • Wed79%(94 flights)
  • Thu78%(102 flights)
  • Fri76%(91 flights)
  • Sat80%(96 flights)
  • Sun84%(101 flights)
On-time by departure window
  • 6–9 AM85%(103 flights)
  • 9 AM–12 PM77%(255 flights)
  • 3–6 PM75%(142 flights)
  • 6–9 PM88%(145 flights)
  • 9 PM–12 AM94%(31 flights)
On-time trend by month
85%
May

Jun 58% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202558%60
July 202564%61
August 202579%61
September 202588%59
October 202590%62
November 202592%59
December 202554%46
January 202681%42
February 202688%50
March 202692%60
April 202695%57
May 202685%59

Keep nerding

Based on 701 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.