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Route Reliability

ALW → Seattle

ALW–SEA · 213 miles · ALW Airport to Seattle–Tacoma International Airport

88
Pretty Reliable
WanderNerd Reliability Score
91%
Arrive within 15 minutes
5 min early
Average arrival delay
2.9%
Cancelled
729
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 91% of the time across 729 flights. No comparison to make.

What the data says

Morning flights do better here.

ALW–SEA flights departing between 3–6 AM arrived on time 97% of the time, versus 82% between 12–3 PM.

Wednesday is the weak spot.

ALW–SEA flights arrived on time 95% of the time on Tuesdays. On Wednesdays: 87%.

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
  • Mon93%(100 flights)
  • Tue95%(103 flights)
  • Wed87%(100 flights)
  • Thu89%(100 flights)
  • Fri89%(100 flights)
  • Sat91%(102 flights)
  • Sun93%(103 flights)
On-time by departure window
  • 3–6 AM97%(349 flights)
  • 12–3 PM82%(196 flights)
  • 3–6 PM89%(163 flights)
On-time trend by month
87%
May

Jun 83% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%59
July 202585%60
August 202588%60
September 202597%60
October 202597%61
November 202589%56
December 202586%57
January 202698%59
February 202696%56
March 202693%60
April 202693%60
May 202687%60

Keep nerding

Based on 729 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.