Flight Reliability
AS 577 · Alaska Airlines
Portland → San Diego (PDX–SAN)88% of its flights flew this route. The rest (SEA–DFW, PDX–LAS) are included in these numbers.
87
Pretty Reliable
WanderNerd Reliability Score
- 81%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 0.6%
- Cancelled
- 1 min early
- Median arrival delay
Based on 174 historical flights. Data through May 2026.
What the data says
Wednesdays have been rough.
AS 577 arrived on time 93% of the time on Saturdays and just 75% on Wednesdays. That gap is worth planning around.
Trending in the right direction.
AS 577 arrived on time 93% of the time over the last three months in the data, compared with 79% in the three months before that.
The breakdown
- Mon77%(26 flights)
- Tue76%(25 flights)
- Wed75%(24 flights)
- Thu83%(24 flights)
- Fri80%(25 flights)
- Sat93%(28 flights)
- Sun81%(21 flights)
- 6–9 AM81%(172 flights)
- 12–3 PM—(1 flights)
90%
May
Nov 62% → May 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| November 2025 | 62% | 29 |
| December 2025 | 71% | 28 |
| January 2026 | 76% | 29 |
| February 2026 | 91% | 11 |
| March 2026 | 92% | 13 |
| April 2026 | 96% | 26 |
| May 2026 | 90% | 31 |
- Departures on time
- 90%
- Diverted
- 0%
- Flights flown
- 173
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 174 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.