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Flight Reliability

AS 121 · Alaska Airlines

Portland → Burbank (PDX–BUR)95% of its flights flew this route. The rest (SEA–HNL) are included in these numbers.

87
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
4 min
Average arrival delay
0.9%
Cancelled
2 min early
Median arrival delay

Based on 332 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

AS 121 departing between 6–9 AM arrived on time 89% of the time, versus 80% between 9 AM–12 PM.

Thursdays have been rough.

AS 121 arrived on time 90% of the time on Fridays and just 75% on Thursdays. That gap is worth planning around.

A bit behind the PDX–BUR route.

AS 121 arrived on time 82% of the time, versus 86% across the PDX–BUR route.

Ticking up lately.

AS 121 arrived on time 90% of the time over the last three months in the data, compared with 83% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(49 flights)
  • Tue86%(49 flights)
  • Wed75%(48 flights)
  • Thu75%(47 flights)
  • Fri90%(48 flights)
  • Sat87%(38 flights)
  • Sun80%(50 flights)
On-time by departure window
  • 6–9 AM89%(85 flights)
  • 9 AM–12 PM80%(244 flights)
On-time trend by month
83%
May

Jun 73% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202577%30
August 202572%29
September 202565%26
October 202582%27
November 2025100%29
December 202581%31
January 202684%31
February 202686%28
March 202694%31
April 202692%25
May 202683%12
Departures on time
90%
Diverted
0%
Flights flown
329
Months covered
12

Same route, other flights

Keep nerding

Based on 332 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.