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Route Reliability

STS → Seattle

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

73
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
9 min
Average arrival delay
2.1%
Cancelled
702
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 74% of the time across 702 flights. No comparison to make.

What the data says

Morning flights do better here.

STS–SEA flights departing between 9 AM–12 PM arrived on time 90% of the time, versus 48% between 6–9 PM.

Monday is the weak spot.

STS–SEA flights arrived on time 80% of the time on Saturdays. On Mondays: 67%.

Ticking up lately.

STS–SEA flights arrived on time 78% of the time over the last three months in the data, compared with 74% 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
  • Mon67%(103 flights)
  • Tue78%(95 flights)
  • Wed77%(94 flights)
  • Thu72%(102 flights)
  • Fri75%(96 flights)
  • Sat80%(93 flights)
  • Sun68%(103 flights)
On-time by departure window
  • 6–9 AM85%(189 flights)
  • 9 AM–12 PM90%(104 flights)
  • 12–3 PM79%(176 flights)
  • 6–9 PM48%(198 flights)
  • 9 PM–12 AM84%(19 flights)
On-time trend by month
75%
May

Jun 52% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202552%58
July 202558%60
August 202562%61
September 202573%60
October 202594%62
November 202586%58
December 202551%51
January 202686%49
February 202684%51
March 202682%60
April 202679%57
May 202675%59

Keep nerding

Based on 702 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.