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Flight Reliability

AS 1138 · Alaska Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and AS 1138 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

73%
Arrive within 15 minutes
14 min
Average arrival delay
1.0%
Cancelled
6 min
Median arrival delay

Based on 290 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(42 flights)
  • Tue76%(41 flights)
  • Wed76%(42 flights)
  • Thu64%(42 flights)
  • Fri68%(40 flights)
  • Sat67%(36 flights)
  • Sun79%(43 flights)
On-time by departure window
  • 3–6 PM73%(281 flights)
  • 6–9 PM—(5 flights)
On-time trend by month
79%
May

Jun 67% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%30
July 202545%29
August 202572%29
September 202589%26
October 202579%24
January 202680%30
February 202668%28
March 202674%31
April 202677%30
May 202679%29
Departures on time
74%
Diverted
0.3%
Flights flown
286
Months covered
10

Keep nerding

Based on 290 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.