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Flight Reliability

AS 580 · Alaska Airlines

San Francisco → Seattle (SFO–SEA)99% of its flights flew this route. The rest (GEG–SAN, SFO–AUS) are included in these numbers.

72
Usually Fine
WanderNerd Reliability Score
79%
Arrive within 15 minutes
3 min
Average arrival delay
3.7%
Cancelled
8 min early
Median arrival delay

Based on 216 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

AS 580 departing between 9 AM–12 PM arrived on time 91% of the time, versus 75% between 12–3 PM.

Thursdays have been rough.

AS 580 arrived on time 87% of the time on Sundays and just 60% on Thursdays. That gap is worth planning around.

A bit ahead of the SFO–SEA route.

AS 580 arrived on time 79% of the time, versus 75% across the SFO–SEA route.

Keep a backup plan handy.

AS 580 was cancelled 3.7% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon76%(29 flights)
  • Tue81%(31 flights)
  • Wed80%(30 flights)
  • Thu60%(30 flights)
  • Fri82%(28 flights)
  • Sat86%(29 flights)
  • Sun87%(31 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM91%(56 flights)
  • 12–3 PM75%(150 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
48%
May

Nov 92% → May 48% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
November 202592%25
December 202576%29
January 202687%30
February 202693%27
March 2026100%28
April 202663%30
May 202648%31
Departures on time
77%
Diverted
0%
Flights flown
208
Months covered
9

Same route, other flights

Keep nerding

Based on 216 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.