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Flight Reliability

AS 2456 · Alaska Airlines

Ontario → Portland (ONT–PDX)88% of its flights flew this route. The rest (PDX–ONT, SEA–EAT) are included in these numbers.

96
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
2 min early
Average arrival delay
1.1%
Cancelled
7 min early
Median arrival delay

Based on 350 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

AS 2456 departing between 12–3 PM arrived on time 94% of the time, versus 68% between 9 PM–12 AM.

Thursdays have been rough.

AS 2456 arrived on time 96% of the time on Sundays and just 79% on Thursdays. That gap is worth planning around.

Better than the Alaska Airlines network average.

AS 2456 arrived on time 92% of the time, versus 80% across the Alaska Airlines network.

Slipping a little lately.

AS 2456 arrived on time 89% of the time over the last three months in the data, compared with 96% in the three months before that.

The breakdown

On-time by weekday
  • Mon94%(50 flights)
  • Tue96%(50 flights)
  • Wed92%(49 flights)
  • Thu79%(48 flights)
  • Fri90%(48 flights)
  • Sat96%(50 flights)
  • Sun96%(51 flights)
On-time by departure window
  • 9 AM–12 PM93%(259 flights)
  • 12–3 PM94%(68 flights)
  • 9 PM–12 AM68%(19 flights)
On-time trend by month
77%
May

Jun 97% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202590%30
August 202593%30
September 202587%30
October 202593%53
November 2025100%27
December 202587%31
February 2026100%17
March 202697%31
April 202693%30
May 202677%31
Departures on time
89%
Diverted
0%
Flights flown
346
Months covered
12

Same route, other flights

Keep nerding

Based on 350 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.