Flight Reliability
AS 1204 · Alaska Airlines
Portland → San Diego (PDX–SAN)
90
Nerd Approved
WanderNerd Reliability Score
- 85%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 0.7%
- Cancelled
- 1 min early
- Median arrival delay
Based on 136 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
AS 1204 arrived on time 95% of the time on Sundays and just 70% on Thursdays. That gap is worth planning around.
A bit ahead of the PDX–SAN route.
AS 1204 arrived on time 85% of the time, versus 81% across the PDX–SAN route.
A bit ahead of the Alaska Airlines network.
AS 1204 arrived on time 85% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon91%(21 flights)
- Tue86%(21 flights)
- Wed86%(21 flights)
- Thu70%(20 flights)
- Fri81%(21 flights)
- Sat90%(10 flights)
- Sun95%(21 flights)
80%
Oct
Jun 89% → Oct 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 89% | 26 |
| July 2025 | 81% | 26 |
| August 2025 | 82% | 28 |
| September 2025 | 93% | 30 |
| October 2025 | 80% | 25 |
- Departures on time
- 87%
- Diverted
- 0%
- Flights flown
- 135
- Months covered
- 5
Same route, other flights
Keep nerding
Based on 136 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.