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Flight Reliability

AS 729 · Alaska Airlines

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

84
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
1 min early
Average arrival delay
1.7%
Cancelled
11 min early
Median arrival delay

Based on 233 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

AS 729 departing between 3–6 PM arrived on time 95% of the time, versus 76% between 6–9 PM.

Friday is doing you no favors.

AS 729 arrived on time 95% of the time on Tuesdays and just 73% on Fridays. That gap is worth planning around.

A bit behind the SAN–PDX route.

AS 729 arrived on time 83% of the time, versus 86% across the SAN–PDX route.

Trending in the right direction.

AS 729 arrived on time 95% of the time over the last three months in the data, compared with 84% in the three months before that.

The breakdown

On-time by weekday
  • Mon92%(36 flights)
  • Tue95%(21 flights)
  • Wed82%(17 flights)
  • Thu83%(40 flights)
  • Fri73%(40 flights)
  • Sat76%(33 flights)
  • Sun83%(42 flights)
On-time by departure window
  • 9 AM–12 PM—(3 flights)
  • 12–3 PM—(3 flights)
  • 3–6 PM95%(21 flights)
  • 6–9 PM76%(114 flights)
  • 9 PM–12 AM88%(88 flights)
On-time trend by month
89%
May

Jun 68% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%19
July 202568%28
August 202579%24
September 202592%12
October 202577%17
November 202573%22
December 202594%18
January 202686%28
February 2026100%10
April 202696%24
May 202689%18
Departures on time
78%
Diverted
0%
Flights flown
229
Months covered
12

Same route, other flights

Keep nerding

Based on 233 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.