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Flight Reliability

AS 498 · Alaska Airlines

Seattle → Portland (SEA–PDX)94% of its flights flew this route. The rest (LAX–SFO) are included in these numbers.

72
Usually Fine
WanderNerd Reliability Score
69%
Arrive within 15 minutes
11 min
Average arrival delay
1.2%
Cancelled
4 min
Median arrival delay

Based on 324 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AS 498 departing between 9 PM–12 AM arrived on time 70% of the time, versus 58% between 9 AM–12 PM.

Thursdays have been rough.

AS 498 arrived on time 85% of the time on Tuesdays and just 56% on Thursdays. That gap is worth planning around.

Lagging the SEA–PDX route.

AS 498 arrived on time 69% of the time, versus 83% across the SEA–PDX route.

Lagging the Alaska Airlines network.

AS 498 arrived on time 69% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon66%(47 flights)
  • Tue85%(46 flights)
  • Wed72%(46 flights)
  • Thu56%(45 flights)
  • Fri75%(44 flights)
  • Sat71%(45 flights)
  • Sun62%(47 flights)
On-time by departure window
  • 9 AM–12 PM58%(19 flights)
  • 9 PM–12 AM70%(301 flights)
On-time trend by month
58%
May

Jun 37% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202537%19
July 202541%29
August 202548%31
September 202583%30
October 202593%29
November 202588%25
December 202564%28
January 202690%30
February 202686%28
March 202665%31
April 202667%21
May 202658%19
Departures on time
66%
Diverted
0%
Flights flown
320
Months covered
12

Same route, other flights

Keep nerding

Based on 324 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.