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Flight Reliability

AS 3409 · Alaska Airlines

San Diego → STS (SAN–STS)81% of its flights flew this route. The rest (STS–SAN) are included in these numbers.

79
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
10 min
Average arrival delay
0.4%
Cancelled
2 min early
Median arrival delay

Based on 242 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

AS 3409 departing between 6–9 AM arrived on time 79% of the time, versus 67% between 12–3 PM.

Friday is doing you no favors.

AS 3409 arrived on time 82% of the time on Thursdays and just 60% on Fridays. That gap is worth planning around.

A bit behind the SAN–STS route.

AS 3409 arrived on time 74% of the time, versus 78% across the SAN–STS route.

A bit behind the Alaska Airlines network.

AS 3409 arrived on time 74% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon67%(36 flights)
  • Tue79%(34 flights)
  • Wed70%(33 flights)
  • Thu82%(34 flights)
  • Fri60%(35 flights)
  • Sat82%(34 flights)
  • Sun77%(34 flights)
On-time by departure window
  • 6–9 AM79%(80 flights)
  • 12–3 PM67%(101 flights)
  • 3–6 PM78%(59 flights)
On-time trend by month
79%
Feb

Jun 70% → Feb 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202587%31
August 202581%31
September 202567%30
October 202570%23
November 202568%28
December 202556%25
January 202681%21
February 202679%14
Departures on time
73%
Diverted
0.4%
Flights flown
240
Months covered
10

Same route, other flights

Keep nerding

Based on 242 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.