Flight Reliability
AS 1258 · Alaska Airlines
Seattle → San Diego (SEA–SAN)
83
Pretty Reliable
WanderNerd Reliability Score
- 90%
- Arrive within 15 minutes
- 6 min early
- Average arrival delay
- 3.0%
- Cancelled
- 11 min early
- Median arrival delay
Based on 134 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
AS 1258 arrived on time 93% of the time on Tuesdays. On Fridays: 85%.
Better than the SEA–SAN route average.
AS 1258 arrived on time 90% of the time, versus 79% across the SEA–SAN route.
Better than the Alaska Airlines network average.
AS 1258 arrived on time 90% of the time, versus 80% across the Alaska Airlines network.
Keep a backup plan handy.
AS 1258 was cancelled 3.0% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon91%(21 flights)
- Tue93%(15 flights)
- Wed93%(14 flights)
- Thu90%(19 flights)
- Fri85%(20 flights)
- Sat90%(20 flights)
- Sun90%(20 flights)
78%
Oct
Jun 90% → Oct 78% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 30 |
| July 2025 | 93% | 29 |
| August 2025 | 93% | 27 |
| September 2025 | 95% | 20 |
| October 2025 | 78% | 23 |
- Departures on time
- 91%
- Diverted
- 0.7%
- Flights flown
- 129
- Months covered
- 5
Same route, other flights
Keep nerding
Based on 134 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.