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Flight Reliability

AS 563 · Alaska Airlines

Kansas City → Seattle (MCI–SEA)96% of its flights flew this route. The rest (PDX–BOI) are included in these numbers.

92
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
2 min
Average arrival delay
1.4%
Cancelled
8 min early
Median arrival delay

Based on 279 historical flights. Data through May 2026.

What the data says

Skip Saturday if you can.

AS 563 arrived on time 98% of the time on Mondays. On Saturdays: 84%.

Better than the MCI–SEA route average.

AS 563 arrived on time 90% of the time, versus 82% across the MCI–SEA route.

Better than the Alaska Airlines network average.

AS 563 arrived on time 90% of the time, versus 80% across the Alaska Airlines network.

Trending in the right direction.

AS 563 arrived on time 94% of the time over the last three months in the data, compared with 82% in the three months before that.

The breakdown

On-time by weekday
  • Mon98%(42 flights)
  • Tue86%(42 flights)
  • Wed95%(41 flights)
  • Thu93%(42 flights)
  • Fri85%(41 flights)
  • Sat84%(25 flights)
  • Sun86%(42 flights)
On-time by departure window
  • 6–9 AM90%(264 flights)
  • 12–3 PM91%(11 flights)
On-time trend by month
97%
May

Jun 89% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%26
July 202596%27
August 202593%29
September 2025100%30
October 202577%26
November 202593%30
December 202577%30
March 2026100%11
April 202686%29
May 202697%31
Departures on time
94%
Diverted
0%
Flights flown
275
Months covered
11

Same route, other flights

Keep nerding

Based on 279 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.