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Flight Reliability

AS 1303 · Alaska Airlines

Seattle → San Jose (SEA–SJC)81% of its flights flew this route. The rest (PDX–SNA, HNL–SEA) are included in these numbers.

89
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
4 min early
Average arrival delay
0.8%
Cancelled
9 min early
Median arrival delay

Based on 241 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

AS 1303 departing between 9 AM–12 PM arrived on time 96% of the time, versus 80% between 3–6 PM.

Saturdays have been rough.

AS 1303 arrived on time 92% of the time on Tuesdays and just 74% on Saturdays. That gap is worth planning around.

A bit ahead of the SEA–SJC route.

AS 1303 arrived on time 85% of the time, versus 82% across the SEA–SJC route.

A bit ahead of the Alaska Airlines network.

AS 1303 arrived on time 85% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon77%(35 flights)
  • Tue92%(37 flights)
  • Wed92%(36 flights)
  • Thu91%(35 flights)
  • Fri91%(34 flights)
  • Sat74%(23 flights)
  • Sun76%(38 flights)
On-time by departure window
  • 9 AM–12 PM96%(44 flights)
  • 12–3 PM90%(62 flights)
  • 3–6 PM80%(132 flights)
On-time trend by month
76%
May

Aug 91% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202591%11
September 202597%29
November 202576%25
December 202572%25
January 202682%28
February 2026100%25
March 202682%28
April 202689%28
May 202676%29
Departures on time
84%
Diverted
0.4%
Flights flown
238
Months covered
11

Same route, other flights

Keep nerding

Based on 241 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.