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Flight Reliability

AS 253 · Alaska Airlines

Kailua-Kona → Portland (KOA–PDX)91% of its flights flew this route. The rest (SEA–ANC) are included in these numbers.

92
Nerd Approved
WanderNerd Reliability Score
84%
Arrive within 15 minutes
3 min early
Average arrival delay
0%
Cancelled
9 min early
Median arrival delay

Based on 237 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

AS 253 departing between 3–6 PM arrived on time 100% of the time, versus 78% between 12–3 PM.

Skip Monday if you can.

AS 253 arrived on time 88% of the time on Tuesdays. On Mondays: 77%.

Better than the KOA–PDX route average.

AS 253 arrived on time 84% of the time, versus 74% across the KOA–PDX route.

A bit ahead of the Alaska Airlines network.

AS 253 arrived on time 84% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon77%(34 flights)
  • Tue88%(34 flights)
  • Wed88%(34 flights)
  • Thu82%(34 flights)
  • Fri88%(33 flights)
  • Sat88%(34 flights)
  • Sun79%(34 flights)
On-time by departure window
  • 9 AM–12 PM88%(76 flights)
  • 12–3 PM78%(129 flights)
  • 3–6 PM100%(10 flights)
  • 9 PM–12 AM100%(22 flights)
On-time trend by month
90%
May

Aug 100% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 2025100%12
September 2025100%10
November 202580%30
December 202581%31
January 202684%31
February 202689%28
March 202668%28
April 202690%30
May 202690%31
Departures on time
76%
Diverted
0%
Flights flown
237
Months covered
10

Same route, other flights

Keep nerding

Based on 237 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.