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Airport Reliability

ALW · Walla Walla

Walla Walla, WA (ALW)

90%
Departures within 15 minutes
2 min
Average departure delay
87%
Arrivals within 15 minutes
2.9%
Departures cancelled

Based on 729 departures and 729 arrivals. Data through May 2026.

What the data says

Morning flights do better here.

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

Wednesday is the weak spot.

Departures from ALW arrived on time 95% of the time on Tuesdays. On Wednesdays: 87%.

When ALW gets messy

On-time by departure window
  • 3–6 AM97%(349 flights)
  • 12–3 PM82%(196 flights)
  • 3–6 PM89%(163 flights)
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 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

Airlines departing ALW

Busiest routes from ALW

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.