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Flight Reliability

AS 821 · Alaska Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and AS 821 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

69%
Arrive within 15 minutes
13 min
Average arrival delay
1.3%
Cancelled
1 min early
Median arrival delay

Based on 231 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon58%(33 flights)
  • Tue76%(29 flights)
  • Wed72%(29 flights)
  • Thu70%(33 flights)
  • Fri58%(33 flights)
  • Sat72%(39 flights)
  • Sun81%(32 flights)
On-time by departure window
  • 6–9 AM65%(130 flights)
  • 9 AM–12 PM65%(17 flights)
  • 3–6 PM82%(67 flights)
  • 6–9 PM57%(14 flights)
On-time trend by month
78%
May

Jun 77% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%30
July 202590%30
August 202570%20
January 202668%31
February 202657%28
March 202652%31
April 202667%27
May 202678%27
Departures on time
79%
Diverted
0%
Flights flown
228
Months covered
9

Keep nerding

Based on 231 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.