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Flight Reliability

AS 499 · Alaska Airlines

Portland → Seattle (PDX–SEA)

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

Based on 279 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 3–6 AM arrived on time 97% of the time, against 92% between 6–9 AM.

Friday is doing you no favors.

AS 499 arrived on time 97% of the time on Saturdays. On Fridays: 85%.

Better than the PDX–SEA route average.

AS 499 arrived on time 92% of the time, versus 84% across the PDX–SEA route.

Better than the Alaska Airlines network average.

AS 499 arrived on time 92% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon93%(40 flights)
  • Tue95%(39 flights)
  • Wed95%(38 flights)
  • Thu90%(39 flights)
  • Fri85%(40 flights)
  • Sat97%(39 flights)
  • Sun90%(41 flights)
On-time by departure window
  • 3–6 AM97%(29 flights)
  • 6–9 AM92%(247 flights)
On-time trend by month
94%
May

Jun 89% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%18
July 2025100%31
August 202590%30
September 202597%30
October 202583%29
November 202586%29
December 2025100%16
February 202694%17
March 202690%31
April 202695%21
May 202694%18
Departures on time
95%
Diverted
0%
Flights flown
276
Months covered
12

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.