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Flight Reliability

AS 2021 · Alaska Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and AS 2021 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

91%
Arrive within 15 minutes
2 min early
Average arrival delay
0.8%
Cancelled
10 min early
Median arrival delay

Based on 389 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon89%(54 flights)
  • Tue93%(55 flights)
  • Wed89%(56 flights)
  • Thu91%(57 flights)
  • Fri90%(58 flights)
  • Sat92%(47 flights)
  • Sun91%(57 flights)
On-time by departure window
  • 6–9 AM94%(66 flights)
  • 9 AM–12 PM91%(136 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM89%(177 flights)
On-time trend by month
84%
May

Jun 95% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202595%19
July 202590%31
August 202595%43
September 202593%59
October 202589%56
November 202590%29
December 202586%28
January 202685%27
February 202692%24
March 202686%28
April 2026100%21
May 202684%19
Departures on time
90%
Diverted
0.5%
Flights flown
384
Months covered
12

Keep nerding

Based on 389 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.