Flight Reliability
AS 939 · Alaska Airlines
Seattle → San Diego (SEA–SAN)99% of its flights flew this route. The rest (SEA–OGG) are included in these numbers.
65
Usually Fine
WanderNerd Reliability Score
- 65%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 1.7%
- Cancelled
- 2 min
- Median arrival delay
Based on 117 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
AS 939 arrived on time 84% of the time on Tuesdays and just 41% on Fridays. That gap is worth planning around.
Lagging the SEA–SAN route.
AS 939 arrived on time 65% of the time, versus 79% across the SEA–SAN route.
Well behind the Alaska Airlines network.
AS 939 arrived on time 65% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon74%(19 flights)
- Tue84%(19 flights)
- Wed56%(18 flights)
- Thu74%(19 flights)
- Fri41%(17 flights)
- Sat—(4 flights)
- Sun53%(19 flights)
- 9 AM–12 PM—(1 flights)
- 6–9 PM65%(114 flights)
65%
Oct
Jun 81% → Oct 65% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 81% | 16 |
| July 2025 | 50% | 26 |
| August 2025 | 64% | 25 |
| September 2025 | 70% | 27 |
| October 2025 | 65% | 20 |
- Departures on time
- 73%
- Diverted
- 0%
- Flights flown
- 115
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 117 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.