Skip to content
WanderNerd
Check a flight

Flight Reliability

AS 528 · Alaska Airlines

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

62
A Little Dicey
WanderNerd Reliability Score
63%
Arrive within 15 minutes
18 min
Average arrival delay
1.2%
Cancelled
6 min
Median arrival delay

Based on 171 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

AS 528 departing between 3–6 PM arrived on time 82% of the time, versus 61% between 6–9 PM.

Thursdays have been rough.

AS 528 arrived on time 88% of the time on Saturdays and just 50% on Thursdays. That gap is worth planning around.

Lagging the SEA–SFO route.

AS 528 arrived on time 63% of the time, versus 70% across the SEA–SFO route.

Well behind the Alaska Airlines network.

AS 528 arrived on time 63% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon62%(26 flights)
  • Tue61%(23 flights)
  • Wed65%(26 flights)
  • Thu50%(24 flights)
  • Fri72%(25 flights)
  • Sat88%(16 flights)
  • Sun52%(29 flights)
On-time by departure window
  • 9 AM–12 PM—(5 flights)
  • 3–6 PM82%(11 flights)
  • 6–9 PM61%(153 flights)
On-time trend by month
32%
May

Jun 82% → May 32% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%11
November 202561%23
December 202565%26
January 202683%29
February 202668%22
March 202675%12
April 202642%12
May 202632%28
Departures on time
62%
Diverted
0%
Flights flown
169
Months covered
9

Same route, other flights

Keep nerding

Based on 171 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.