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Route Reliability

Seattle → ALW

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

83
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
2 min early
Average arrival delay
2.6%
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 87% of the time across 729 flights. No comparison to make.

What the data says

The late departure is the smart one here.

SEA–ALW flights departing between 9 PM–12 AM arrived on time 93% of the time, versus 79% between 12–3 PM.

Thursdays have been rough.

SEA–ALW flights arrived on time 93% of the time on Tuesdays and just 78% on Thursdays. That gap is worth planning around.

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
  • Mon89%(103 flights)
  • Tue93%(101 flights)
  • Wed86%(101 flights)
  • Thu78%(100 flights)
  • Fri85%(101 flights)
  • Sat84%(102 flights)
  • Sun90%(100 flights)
On-time by departure window
  • 9 AM–12 PM87%(78 flights)
  • 12–3 PM79%(282 flights)
  • 3–6 PM—(1 flights)
  • 9 PM–12 AM93%(347 flights)
On-time trend by month
90%
May

Jun 71% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%59
July 202577%60
August 202583%60
September 202590%60
October 202589%61
November 202589%56
December 202584%57
January 202693%59
February 202693%55
March 202687%61
April 202693%60
May 202690%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.