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Flight Reliability

AS 1311 · Alaska Airlines

San Jose → Seattle (SJC–SEA)94% of its flights flew this route. The rest (GEG–LAX) are included in these numbers.

89
Pretty Reliable
WanderNerd Reliability Score
92%
Arrive within 15 minutes
10 min early
Average arrival delay
2.9%
Cancelled
14 min early
Median arrival delay

Based on 310 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 95% of the time, against 92% between 9 AM–12 PM.

Friday is doing you no favors.

AS 1311 arrived on time 98% of the time on Mondays. On Fridays: 87%.

Better than the SJC–SEA route average.

AS 1311 arrived on time 92% of the time, versus 84% across the SJC–SEA route.

Better than the Alaska Airlines network average.

AS 1311 arrived on time 92% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon98%(50 flights)
  • Tue93%(45 flights)
  • Wed93%(45 flights)
  • Thu90%(48 flights)
  • Fri87%(46 flights)
  • Sat91%(33 flights)
  • Sun94%(34 flights)
On-time by departure window
  • 6–9 AM95%(43 flights)
  • 9 AM–12 PM92%(258 flights)
On-time trend by month
96%
May

Jun 73% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%15
July 202588%25
August 202588%25
September 202588%25
October 2025100%22
November 202592%26
December 2025100%29
January 202687%30
February 2026100%24
March 202688%25
April 2026100%28
May 202696%27
Departures on time
93%
Diverted
0%
Flights flown
301
Months covered
12

Same route, other flights

Keep nerding

Based on 310 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.